SEC Info - Mackinac Financial Corp./MI - ‘10-K’ for 12/31/20

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Mackinac Financial Corp./MI – ‘10-K’ for 12/31/20 – ‘JSON’

On: Friday, 3/12/21, at 10:52am ET · For: 12/31/20 · Accession #: 1558370-21-2868 · File #: 0-20167

Previous ‘10-K’: ‘10-K’ on 3/12/20 for 12/31/19 · Latest ‘10-K’: This Filing · 12 References:

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 3/12/21  Mackinac Financial Corp./MI       10-K       12/31/20  102:25M                                    Toppan Merrill Bridge/FA

Annual Report — Form 10-K
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   3.20M 
 2: EX-4.1      Instrument Defining the Rights of Security Holders  HTML     34K 
 3: EX-10.6     Material Contract                                   HTML     52K 
 4: EX-21       Subsidiaries List                                   HTML     25K 
 5: EX-23.1     Consent of Expert or Counsel                        HTML     26K 
 6: EX-31       Certification -- §302 - SOA'02                      HTML     39K 
 7: EX-32.1     Certification -- §906 - SOA'02                      HTML     28K 
 8: EX-32.2     Certification -- §906 - SOA'02                      HTML     28K 
15: R1          Document and Entity Information                     HTML     87K 
16: R2          Consolidated Balance Sheets                         HTML    123K 
17: R3          Consolidated Balance Sheets (Parenthetical)         HTML     34K 
18: R4          Consolidated Statements of Operations               HTML    130K 
19: R5          Consolidated Statements Comprehensive Income        HTML     65K 
20: R6          Consolidated Statements of Changes in               HTML     74K 
                Shareholders' Equity                                             
21: R7          Consolidated Statements of Cash Flows               HTML    121K 
22: R8          Summary of Significant Accounting Policies          HTML     92K 
23: R9          Restrictions on Cash and Cash Equivalents           HTML     29K 
24: R10         Securities Available for Sale                       HTML    322K 
25: R11         Loans                                               HTML   1.09M 
26: R12         Premises and Equipment                              HTML     49K 
27: R13         Other Real Estate Held for Sale                     HTML     49K 
28: R14         Deposits                                            HTML     60K 
29: R15         Goodwill and Other Intangible Assets                HTML     71K 
30: R16         Servicing Rights                                    HTML     59K 
31: R17         Borrowings                                          HTML     54K 
32: R18         Income Taxes                                        HTML    104K 
33: R19         Leases                                              HTML     51K 
34: R20         Retirement Plan                                     HTML     32K 
35: R21         Defined Benefit Pension Plan                        HTML     85K 
36: R22         Deferred Compensation Plan                          HTML     32K 
37: R23         Regulatory Matters                                  HTML    217K 
38: R24         Stock Compensation Plans                            HTML     62K 
39: R25         Shareholders' Equity                                HTML     29K 
40: R26         Commitments, Contingencies and Credit Risk          HTML     54K 
41: R27         Fair Value                                          HTML    359K 
42: R28         Parent Company Only Financial Statements            HTML    173K 
43: R29         Summary of Significant Accounting Policies          HTML    144K 
                (Policies)                                                       
44: R30         Summary of Significant Accounting Policies          HTML     55K 
                (Tables)                                                         
45: R31         Securities Available for Sale (Tables)              HTML    327K 
46: R32         Loans (Tables)                                      HTML   1.09M 
47: R33         Premises and Equipment (Tables)                     HTML     48K 
48: R34         Other Real Estate Held for Sale (Tables)            HTML     48K 
49: R35         Deposits (Tables)                                   HTML     61K 
50: R36         Goodwill and Other Intangible Assets (Tables)       HTML     68K 
51: R37         Servicing Rights (Tables)                           HTML     51K 
52: R38         Borrowings (Tables)                                 HTML     55K 
53: R39         Income Taxes (Tables)                               HTML    106K 
54: R40         Leases (Tables)                                     HTML     50K 
55: R41         Defined Benefit Pension Plan (Tables)               HTML     88K 
56: R42         Regulatory Matters (Tables)                         HTML    214K 
57: R43         Stock Compensation Plans (Tables)                   HTML     61K 
58: R44         Commitments, Contingencies, and Credit Risk         HTML     47K 
                (Tables)                                                         
59: R45         Fair Value (Tables)                                 HTML    352K 
60: R46         Parent Company Only Financial Statements (Tables)   HTML    175K 
61: R47         Summary of Significant Accounting Policies          HTML    102K 
                (Details)                                                        
62: R48         Restrictions on Cash and Cash Equivalents           HTML     32K 
                (Details)                                                        
63: R49         Securities Available for Sale (Details)             HTML     71K 
64: R50         Securities Available for Sale - by Contractual      HTML     75K 
                Maturity (Details)                                               
65: R51         Securities Available for Sale - Gross Unrealized    HTML     78K 
                Losses and Length of Time in Loss Position                       
                (Details)                                                        
66: R52         Loans (Details)                                     HTML    228K 
67: R53         Loans - Allowance (Details)                         HTML    171K 
68: R54         Loans - Loans by Risk Category (Details)            HTML    117K 
69: R55         Loans - Impaired Loans and Effect on Interest       HTML     78K 
                Income (Details)                                                 
70: R56         Loans - Past Due (Details)                          HTML     64K 
71: R57         Loans - Troubled Debt Restructuring (Details)       HTML     42K 
72: R58         Loans - Insider Loans (Details)                     HTML     44K 
73: R59         Premises and Equipment (Details)                    HTML     44K 
74: R60         Other Real Estate Held for Sale (Details)           HTML     42K 
75: R61         Deposits (Details)                                  HTML     56K 
76: R62         Goodwill and Other Intangible Assets (Details)      HTML     69K 
77: R63         Servicing Rights (Details)                          HTML     57K 
78: R64         Borrowings (Details)                                HTML     79K 
79: R65         Borrowings - Maturities (Details)                   HTML     40K 
80: R66         Income Taxes (Details)                              HTML     97K 
81: R67         Leases (Details)                                    HTML     60K 
82: R68         Retirement Plan (Details)                           HTML     33K 
83: R69         Defined Benefit Pension Plan (Details)              HTML    103K 
84: R70         Deferred Compensation Plan (Details)                HTML     44K 
85: R71         Regulatory Matters (Details)                        HTML     91K 
86: R72         Stock Compensation Plans (Details)                  HTML     74K 
87: R73         Shareholders' Equity (Details)                      HTML     51K 
88: R74         Commitments, Contingencies, and Credit Risk         HTML     42K 
                (Details)                                                        
89: R75         Commitments, Contingencies, and Credit Risk -       HTML     38K 
                Credit Risk (Details)                                            
90: R76         Fair Value (Details)                                HTML     88K 
91: R77         Fair Value - Other Assets and Other Liabilities     HTML     33K 
                (Details)                                                        
92: R78         Fair Value - Recurring (Details)                    HTML     49K 
93: R79         Fair Value - Level 3 Activities (Details)           HTML     44K 
94: R80         Fair Value - Nonrecurring Basis (Details)           HTML     45K 
95: R81         Parent Company Only Financial Statements - Balance  HTML     72K 
                Sheets (Details)                                                 
96: R82         Parent Company Only Financial Statements - Balance  HTML     37K 
                Sheets (Parenthetical) (Details)                                 
97: R83         Parent Company Only Financial Statements -          HTML     71K 
                Statement of Operations (Details)                                
98: R84         Parent Company Only Financial Statements - Cash     HTML     78K 
                Flows (Details)                                                  
100: XML         IDEA XML File -- Filing Summary                      XML    183K  
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99: EXCEL       IDEA Workbook of Financial Reports                  XLSX    153K 
10: EX-101.CAL  XBRL Calculations -- mfnc-20201231_cal               XML    333K 
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12: EX-101.LAB  XBRL Labels -- mfnc-20201231_lab                     XML   2.08M 
13: EX-101.PRE  XBRL Presentations -- mfnc-20201231_pre              XML   1.55M 
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101: JSON        XBRL Instance as JSON Data -- MetaLinks              552±   830K  
102: ZIP         XBRL Zipped Folder -- 0001558370-21-002868-xbrl      Zip    577K

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                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "centralIndexKeyItemType"
                },
            "dei_EntityCommonStockSharesOutstanding":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report.  Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
                            "label":  "Entity Common Stock, Shares Outstanding"
                            }
                        }
                    },
                "localname":  "EntityCommonStockSharesOutstanding",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "dei_EntityCurrentReportingStatus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Current Reporting Status"
                            }
                        }
                    },
                "localname":  "EntityCurrentReportingStatus",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityEmergingGrowthCompany":  {
                "auth_ref":  [
                    "r702"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate if registrant meets the emerging growth company criteria.",
                            "label":  "Entity Emerging Growth Company"
                            }
                        }
                    },
                "localname":  "EntityEmergingGrowthCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityFileNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Commission file number.  The field allows up to 17 characters.  The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
                            "label":  "Entity File Number"
                            }
                        }
                    },
                "localname":  "EntityFileNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "fileNumberItemType"
                },
            "dei_EntityFilerCategory":  {
                "auth_ref":  [
                    "r702"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate whether the registrant is one of the following:  Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer.  Definitions of these categories are stated in Rule 12b-2 of the Exchange Act.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Filer Category"
                            }
                        }
                    },
                "localname":  "EntityFilerCategory",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "filerCategoryItemType"
                },
            "dei_EntityIncorporationStateCountryCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Two-character EDGAR code representing the state or country of incorporation.",
                            "label":  "Entity Incorporation, State or Country Code"
                            }
                        }
                    },
                "localname":  "EntityIncorporationStateCountryCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "edgarStateCountryItemType"
                },
            "dei_EntityInteractiveDataCurrent":  {
                "auth_ref":  [
                    "r703"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
                            "label":  "Entity Interactive Data Current"
                            }
                        }
                    },
                "localname":  "EntityInteractiveDataCurrent",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityPublicFloat":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.",
                            "label":  "Entity Public Float"
                            }
                        }
                    },
                "localname":  "EntityPublicFloat",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "dei_EntityRegistrantName":  {
                "auth_ref":  [
                    "r702"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
                            "label":  "Entity Registrant Name"
                            }
                        }
                    },
                "localname":  "EntityRegistrantName",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityShellCompany":  {
                "auth_ref":  [
                    "r702"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
                            "label":  "Entity Shell Company"
                            }
                        }
                    },
                "localname":  "EntityShellCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntitySmallBusiness":  {
                "auth_ref":  [
                    "r702"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicates that the company is a Smaller Reporting Company (SRC).",
                            "label":  "Entity Small Business"
                            }
                        }
                    },
                "localname":  "EntitySmallBusiness",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityTaxIdentificationNumber":  {
                "auth_ref":  [
                    "r702"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
                            "label":  "Entity Tax Identification Number"
                            }
                        }
                    },
                "localname":  "EntityTaxIdentificationNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "employerIdItemType"
                },
            "dei_EntityVoluntaryFilers":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.",
                            "label":  "Entity Voluntary Filers"
                            }
                        }
                    },
                "localname":  "EntityVoluntaryFilers",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityWellKnownSeasonedIssuer":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.",
                            "label":  "Entity Well-known Seasoned Issuer"
                            }
                        }
                    },
                "localname":  "EntityWellKnownSeasonedIssuer",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_IcfrAuditorAttestationFlag":  {
                "auth_ref":  [
                    "r698",
                    "r699",
                    "r700"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "ICFR Auditor Attestation Flag"
                            }
                        }
                    },
                "localname":  "IcfrAuditorAttestationFlag",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_LocalPhoneNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Local phone number for entity.",
                            "label":  "Local Phone Number"
                            }
                        }
                    },
                "localname":  "LocalPhoneNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_Security12bTitle":  {
                "auth_ref":  [
                    "r696"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Title of a 12(b) registered security.",
                            "label":  "Title of 12(b) Security"
                            }
                        }
                    },
                "localname":  "Security12bTitle",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "securityTitleItemType"
                },
            "dei_SecurityExchangeName":  {
                "auth_ref":  [
                    "r697"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Name of the Exchange on which a security is registered.",
                            "label":  "Security Exchange Name"
                            }
                        }
                    },
                "localname":  "SecurityExchangeName",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "edgarExchangeCodeItemType"
                },
            "dei_TradingSymbol":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Trading symbol of an instrument as listed on an exchange.",
                            "label":  "Trading Symbol"
                            }
                        }
                    },
                "localname":  "TradingSymbol",
                "nsuri":  "http://xbrl.sec.gov/dei/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DocumentDocumentAndEntityInformation"
                    ],
                "xbrltype":  "tradingSymbolItemType"
                },
            "mfnc_AcceptableMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the category of financing receivables considered to be acceptable.",
                            "label":  "Acceptable [Member]",
                            "terseLabel":  "Acceptable"
                            }
                        }
                    },
                "localname":  "AcceptableMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_AcceptableWatchMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the category of financing receivables considered to be acceptable watch.",
                            "label":  "Acceptable Watch [Member]",
                            "terseLabel":  "Acceptable Watch"
                            }
                        }
                    },
                "localname":  "AcceptableWatchMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_AccruedInterestReceivableFairValueDisclosure":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/DisclosureFairValueDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_AssetsFairValueDisclosure",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the fair value of the accrued interest receivable by the entity.",
                            "label":  "Accrued Interest Receivable Fair Value Disclosure",
                            "terseLabel":  "Accrued interest receivable"
                            }
                        }
                    },
                "localname":  "AccruedInterestReceivableFairValueDisclosure",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureFairValueDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanTax":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).",
                            "label":  "Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Tax",
                            "terseLabel":  "Amount of tax on actuarial losses on the defined benefit pension obligation"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanTax",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_AcquiredImpairedLoansMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the information pertaining to acquired impaired loans.",
                            "label":  "Acquired Impaired Loans [Member]",
                            "terseLabel":  "Acquired Impaired"
                            }
                        }
                    },
                "localname":  "AcquiredImpairedLoansMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_AcquiredNonimpairedLoansMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the information pertaining to acquired nonimpaired loans.",
                            "label":  "Acquired Nonimpaired Loans [Member]",
                            "terseLabel":  "Acquired Non-impaired"
                            }
                        }
                    },
                "localname":  "AcquiredNonimpairedLoansMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_AdditionsFromLoansSoldWithServicingRetained":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Additions from loans sold with servicing retained.",
                            "label":  "Additions from loans sold with servicing retained",
                            "terseLabel":  "Additions from loans sold with servicing retained"
                            }
                        }
                    },
                "localname":  "AdditionsFromLoansSoldWithServicingRetained",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_AvailableForSaleSecuritiesDebtMaturitiesExcludingSecuritiesWithoutSingleMaturityDateAmortizedCost":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/DisclosureSecuritiesAvailableForSaleByContractualMaturityDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the amount of available-for-sale debt securities at cost, net of adjustments, excluding securities that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings.",
                            "label":  "Available For Sale Securities Debt Maturities Excluding Securities without Single Maturity Date Amortized Cost",
                            "totalLabel":  "Subtotal"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesExcludingSecuritiesWithoutSingleMaturityDateAmortizedCost",
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                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureSecuritiesAvailableForSaleByContractualMaturityDetails"
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            "mfnc_AvailableForSaleSecuritiesDebtMaturitiesExcludingSecuritiesWithoutSingleMaturityDateFairValue":  {
                "auth_ref":  [
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                "calculation":  {
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                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the amount of available-for-sale debt securities at fair value excluding securities that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.",
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                            "totalLabel":  "Subtotal"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesExcludingSecuritiesWithoutSingleMaturityDateFairValue",
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                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureSecuritiesAvailableForSaleByContractualMaturityDetails"
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                "xbrltype":  "monetaryItemType"
                },
            "mfnc_AvailableForSaleSecuritiesGrossRealizedGainsLossesSalesAndCallsProceeds":  {
                "auth_ref":  [
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                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The total amount of proceeds received from the sales and calls of securities which are classified as available-for-sale.",
                            "label":  "Available For Sale Securities Gross Realized Gains (Losses) Sales and Calls Proceeds",
                            "terseLabel":  "Proceeds from sales and calls"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesGrossRealizedGainsLossesSalesAndCallsProceeds",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureSecuritiesAvailableForSaleByContractualMaturityDetails"
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                "xbrltype":  "monetaryItemType"
                },
            "mfnc_AverageMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the category of financing receivables considered to be average.",
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                            "terseLabel":  "Average (3)"
                            }
                        }
                    },
                "localname":  "AverageMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_BrokeredDeposits":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_Deposits",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the large-denomination bank deposit that is sold by a bank to a broker, which then divides it into smaller pieces for sale to its customers.",
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                            "terseLabel":  "Brokered"
                            }
                        }
                    },
                "localname":  "BrokeredDeposits",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureDepositsDetails",
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_CashAndCashEquivalentsAtCarryingValueExcludingInterestBearingDeposits":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Cash and cash equivalents excluding interest bearing deposits.",
                            "label":  "Cash And Cash Equivalents, At Carrying Value Excluding Interest Bearing Deposits",
                            "totalLabel":  "Cash and cash equivalents"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsAtCarryingValueExcludingInterestBearingDeposits",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_CommercialConstructionLoanReceivablesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Commercial construction loan receivables.",
                            "label":  "Commercial Construction Loan Receivables [Member]",
                            "terseLabel":  "Commercial construction loan receivables [Member]"
                            }
                        }
                    },
                "localname":  "CommercialConstructionLoanReceivablesMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansAllowanceDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansImpairedLoansAndEffectOnInterestIncomeDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails"
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                "xbrltype":  "domainItemType"
                },
            "mfnc_CommercialFinancialAndAgriculturalLoansMember":  {
                "auth_ref":  [
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                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to financing receivables related to commercial, financial, and agricultural loans.",
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                            "terseLabel":  "Commercial, financial, and agricultural"
                            }
                        }
                    },
                "localname":  "CommercialFinancialAndAgriculturalLoansMember",
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                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansAllowanceDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansImpairedLoansAndEffectOnInterestIncomeDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_CommercialLoansAbstract":  {
                "auth_ref":  [
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                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "Commercial Loans [Abstract]",
                            "terseLabel":  "Commercial Loans"
                            }
                        }
                    },
                "localname":  "CommercialLoansAbstract",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
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                "xbrltype":  "stringItemType"
                },
            "mfnc_CommercialLoansServicingAmount":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the amount of guaranteed portion of the commercial loans which was sold to a third party with servicing retained.",
                            "label":  "Commercial Loans Servicing Amount",
                            "terseLabel":  "Commercial Loans"
                            }
                        }
                    },
                "localname":  "CommercialLoansServicingAmount",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
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                "xbrltype":  "monetaryItemType"
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            "mfnc_CommercialLoansValuationOfServicingRights":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the fair value of servicing assets of commercial loans.",
                            "label":  "Commercial Loans Valuation of Servicing Rights",
                            "terseLabel":  "Servicing rights"
                            }
                        }
                    },
                "localname":  "CommercialLoansValuationOfServicingRights",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_CommonEquityTierOneRiskBasedCapital":  {
                "auth_ref":  [
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                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Common Equity Tier 1 capital as defined by regulations.",
                            "label":  "Common Equity Tier One Risk Based Capital",
                            "terseLabel":  "Common equity Tier 1 capital to risk weighted assets, Actual Amount"
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                    },
                "localname":  "CommonEquityTierOneRiskBasedCapital",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureRegulatoryMattersDetails"
                    ],
                "xbrltype":  "monetaryItemType"
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            "mfnc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy":  {
                "auth_ref":  [
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                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The minimum amount of Common Equity Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.",
                            "label":  "Common Equity Tier One Risk Based Capital Required For Capital Adequacy",
                            "terseLabel":  "Common equity Tier 1 capital to risk weighted assets, Minimum for Capital,Adequacy Purpose Amount"
                            }
                        }
                    },
                "localname":  "CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureRegulatoryMattersDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The minimum Common Equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.",
                            "label":  "Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets",
                            "terseLabel":  "Common equity Tier 1 capital to risk weighted assets, Minimum for Capital Adequacy Adequacy Purpose Ratio (as a percent)"
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                "presentation":  [
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                "xbrltype":  "percentItemType"
                },
            "mfnc_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The amount of Common Equity Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.",
                            "label":  "Common Equity Tier One Risk Based Capital Required To Be Well Capitalized",
                            "terseLabel":  "Common equity Tier 1 capital to risk weighted assets, Well-Capitalized Amount"
                            }
                        }
                    },
                "localname":  "CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureRegulatoryMattersDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The Common Equity Tier 1 capital ratio (Common Equity Tier 1 capital divided by risk weighted assets) required to be categorized as \"well capitalized\" under the regulatory framework for prompt corrective action.",
                            "label":  "Common Equity Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets",
                            "terseLabel":  "Common equity Tier 1 capital to risk weighted assets, Well-Capitalized Ratio (as a percent)"
                            }
                        }
                    },
                "localname":  "CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureRegulatoryMattersDetails"
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                "xbrltype":  "percentItemType"
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            "mfnc_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations.",
                            "label":  "Common Equity Tier One Risk Based Capital To Risk Weighted Assets",
                            "terseLabel":  "Common equity Tier 1 capital to risk weighted assets, Actual Ratio (as a percent)"
                            }
                        }
                    },
                "localname":  "CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets",
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                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureRegulatoryMattersDetails"
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                "xbrltype":  "percentItemType"
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            "mfnc_ConsumerConstructionLoansMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to financing receivables related to consumer construction loans.",
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                            "terseLabel":  "Consumer construction"
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                        }
                    },
                "localname":  "ConsumerConstructionLoansMember",
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                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansAllowanceDetails",
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                "xbrltype":  "domainItemType"
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            "mfnc_CreditCardCommitmentsMember":  {
                "auth_ref":  [
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                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the unsecured commitments to borrowers for the credit cards issued by the entity.",
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                        }
                    },
                "localname":  "CreditCardCommitmentsMember",
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                "presentation":  [
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                "xbrltype":  "domainItemType"
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            "mfnc_DebtInstrumentFloorInterestRate":  {
                "auth_ref":  [
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                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the floor rate on an interest rate debt instrument such as an interest rate floor.  If market rates falls below the floor rate, a payment or receipt is triggered on the contract.",
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                            "terseLabel":  "Floor rate (as a percent)"
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                        }
                    },
                "localname":  "DebtInstrumentFloorInterestRate",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureBorrowingsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "mfnc_DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossTax":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount tax, of unrealized gains in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
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                            "terseLabel":  "Amount of tax on unrealized gains on available for sales securities"
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                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleAccumulatedGrossUnrealizedLossTax",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                "xbrltype":  "monetaryItemType"
                },
            "mfnc_DebtSecuritiesAvailableForSaleRestrictedAmortizedCost":  {
                "auth_ref":  [
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                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of restricted investment in debt security measured at amortized cost.",
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                    },
                "localname":  "DebtSecuritiesAvailableForSaleRestrictedAmortizedCost",
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                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureBorrowingsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_DeferredCompensationArrangementWithIndividualContractualTerm":  {
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                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the period over which benefits are to be paid under the deferred compensation plan.",
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                            "terseLabel":  "Original contractual term"
                            }
                        }
                    },
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                "xbrltype":  "durationItemType"
                },
            "mfnc_DeferredTaxAssetsLeaseLiability":  {
                "auth_ref":  [
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                "calculation":  {
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                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liability.",
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                            "terseLabel":  "Lease liability"
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                        }
                    },
                "localname":  "DeferredTaxAssetsLeaseLiability",
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                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "mfnc_FinancingReceivableNumberOfDaysPastDueToBeNonperforming":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Number of days past due to be considered as nonperforming loans.",
                            "label":  "Financing Receivable Number of Days Past Due to be Nonperforming",
                            "terseLabel":  "Number of days past due to be considered as nonperforming loans"
                            }
                        }
                    },
                "localname":  "FinancingReceivableNumberOfDaysPastDueToBeNonperforming",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansImpairedLoansAndEffectOnInterestIncomeDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "mfnc_FinancingReceivableRecordedInvestment30To89DaysPastDueAndStillAccruing":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_FinancingReceivableRecordedInvestmentPastDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the financing receivables that are less than 90 days past due but more than 30 days past due and still accruing.",
                            "label":  "Financing Receivable Recorded Investment 30 to 89 Days Past Due and Still Accruing",
                            "terseLabel":  "30-89 days Past Due (accruing)"
                            }
                        }
                    },
                "localname":  "FinancingReceivableRecordedInvestment30To89DaysPastDueAndStillAccruing",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_FinancingReceivables30To89DaysPastDueMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Financing receivables that are more than 29 days past due but fewer than 90 days past due.",
                            "label":  "Financing Receivables30 To89 Days Past Due [Member]",
                            "terseLabel":  "30-89 days Past Due"
                            }
                        }
                    },
                "localname":  "FinancingReceivables30To89DaysPastDueMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_FinancingReceivables90DaysPastDue":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_FinancingReceivableRecordedInvestmentPastDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the financing receivables that are equal to more than 90 days past due.",
                            "label":  "Financing Receivables 90 +Days Past Due",
                            "terseLabel":  "90+ days Past Due"
                            }
                        }
                    },
                "localname":  "FinancingReceivables90DaysPastDue",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansPastDueDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_FirstFederalOfNorthernMichiganBancorpIncMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the information pertaining to acquisition of First Federal of Northern Michigan Bancorp, Inc in Alpena, Michigan (\"FFNM\").",
                            "label":  "First Federal Of Northern Michigan Bancorp Inc [Member]",
                            "terseLabel":  "FFNM"
                            }
                        }
                    },
                "localname":  "FirstFederalOfNorthernMichiganBancorpIncMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureDeferredCompensationPlanDetails",
                    "http://www.bankmbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansTables"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_FirstNationalBankOfEagleRiverMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the information pertaining to acquisition of First National Bank of Eagle River (\"Eagle\").",
                            "label":  "First National Bank Of Eagle River [Member]",
                            "terseLabel":  "Eagle River"
                            }
                        }
                    },
                "localname":  "FirstNationalBankOfEagleRiverMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansTables"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_FirstRuralRelendingMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to First Rural Relending, the wholly owned subsidiary of the entity.",
                            "label":  "First Rural Relending [Member]",
                            "terseLabel":  "First Rural Relending"
                            }
                        }
                    },
                "localname":  "FirstRuralRelendingMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureBorrowingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_ForeclosedResidentialRealEstateProperty":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Carrying amount as of the balance sheet date of foreclosed residential real estate property.",
                            "label":  "Foreclosed Residential Real Estate Property",
                            "terseLabel":  "Foreclosed residential real estate property"
                            }
                        }
                    },
                "localname":  "ForeclosedResidentialRealEstateProperty",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureOtherRealEstateHeldForSaleDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_FurnitureFixturesAndEquipmentMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utility.  Also includes tangible personal property used to produce goods and services.",
                            "label":  "Furniture Fixtures And Equipment [Member]",
                            "terseLabel":  "Furniture, fixtures, and equipment"
                            }
                        }
                    },
                "localname":  "FurnitureFixturesAndEquipmentMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosurePremisesAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_GainLossOnSaleOfSecondaryMarketLoans":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfCashFlows":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents gains (losses) on sale of secondary market loans included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period.",
                            "label":  "Gain (Loss) on Sale of Secondary Market Loans",
                            "negatedLabel":  "(Gain) on sale of loans sold in the secondary market"
                            }
                        }
                    },
                "localname":  "GainLossOnSaleOfSecondaryMarketLoans",
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                "presentation":  [
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                "xbrltype":  "monetaryItemType"
                },
            "mfnc_GainOnSaleOfLoan":  {
                "auth_ref":  [
                    ],
                "calculation":  {
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                        "parentTag":  "us-gaap_NoninterestIncome",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents the net gain (loss) resulting from a sale of SBA/USDA loans, these SBA/USDA guaranteed loans are sold at a premium on the secondary market, with the Bank retaining the servicing.",
                            "label":  "Gain on Sale of Loan",
                            "terseLabel":  "SBA/USDA loan sale gains"
                            }
                        }
                    },
                "localname":  "GainOnSaleOfLoan",
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                "presentation":  [
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                    ],
                "xbrltype":  "monetaryItemType"
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            "mfnc_GainsLossesOnSalesOfPremisesEquipmentAndOtherRealEstateHeldForSale":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfCashFlows":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The net gain (loss) resulting from sales and other disposals of premises, equipment, and other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.",
                            "label":  "Gains (Losses) on Sales of Premises, Equipment and Other Real Estate Held For Sale",
                            "negatedLabel":  "(Gain) loss on sale other real estate held for sale and fixed assets"
                            }
                        }
                    },
                "localname":  "GainsLossesOnSalesOfPremisesEquipmentAndOtherRealEstateHeldForSale",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_GoodMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the category of financing receivables considered to be good.",
                            "label":  "Good [Member]",
                            "terseLabel":  "Good (2)"
                            }
                        }
                    },
                "localname":  "GoodMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansLoansByRiskCategoryDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_ImpairedAndNonimpairedLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDuringPeriodTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the roll forward that is reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Impaired And Nonimpaired Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield During Period [Table Text Block]",
                            "terseLabel":  "Schedule of the accretable yield by acquisition"
                            }
                        }
                    },
                "localname":  "ImpairedAndNonimpairedLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDuringPeriodTableTextBlock",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "textBlockItemType"
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            "mfnc_ImpairedAndNonimpairedLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the reconciliation of contractual cash flows to the carrying amount relating to impaired and non impaired loans acquired in a transfer.",
                            "label":  "Impaired And Nonimpaired Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period Table Text Block",
                            "terseLabel":  "Schedule of acquired portfolio at acquisition date"
                            }
                        }
                    },
                "localname":  "ImpairedAndNonimpairedLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodTableTextBlock",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "textBlockItemType"
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            "mfnc_ImpairedFinanceReceivablesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to impaired financing receivables.",
                            "label":  "Impaired Finance Receivables [Member]",
                            "terseLabel":  "Impaired loans"
                            }
                        }
                    },
                "localname":  "ImpairedFinanceReceivablesMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureFairValueNonrecurringBasisDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_IncentiveCompensationPlan2012Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the information pertaining to 2012 Incentive Compensation Plan of the entity.",
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                            "terseLabel":  "2012 Incentive Compensation Plan"
                            }
                        }
                    },
                "localname":  "IncentiveCompensationPlan2012Member",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents revenue less expenses from ongoing operations, after income taxes, but before income or loss from equity method investments.",
                            "label":  "Income (Loss) from Continuing Operations before Income (Loss) from Equity Method Investments",
                            "terseLabel":  "Loss before equity in net income of subsidiaries"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_IncomeTaxOtherDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "Income Tax Other Disclosure [Abstract]",
                            "terseLabel":  "INCOME TAXES"
                            }
                        }
                    },
                "localname":  "IncomeTaxOtherDisclosureAbstract",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureIncomeTaxesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "mfnc_InterestAndFeeIncomeLoansAndLeasesTaxExempt":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_InterestAndDividendIncomeOperating",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents interest income derived from fees on loans which are exempt from federal income taxes.",
                            "label":  "Interest and Fee Income Loans and Leases Tax Exempt",
                            "terseLabel":  "Tax-exempt"
                            }
                        }
                    },
                "localname":  "InterestAndFeeIncomeLoansAndLeasesTaxExempt",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_InterestAndFeeIncomeLoansAndLeasesTaxable":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_InterestAndDividendIncomeOperating",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents interest income derived from fees on loans which are subject to federal income taxes.",
                            "label":  "Interest and Fee Income Loans and Leases Taxable",
                            "terseLabel":  "Taxable"
                            }
                        }
                    },
                "localname":  "InterestAndFeeIncomeLoansAndLeasesTaxable",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LiborRateAtPointOfTime":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "LIBOR rate at point of time.",
                            "label":  "LIBOR Rate At Point Of Time",
                            "terseLabel":  "LIBOR rate at point of time"
                            }
                        }
                    },
                "localname":  "LiborRateAtPointOfTime",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureBorrowingsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "mfnc_LincolnCommunityBankMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Lincoln community Bank.",
                            "label":  "Lincoln Community Bank [Member]",
                            "terseLabel":  "Lincoln Community Bank"
                            }
                        }
                    },
                "localname":  "LincolnCommunityBankMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansTables"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_LoanAndDepositExpense":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_NoninterestExpense",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents expenses related to loan and deposit during the reporting period by reporting entity.",
                            "label":  "Loan and Deposit Expense",
                            "terseLabel":  "Loan origination expenses and deposit and card related fees"
                            }
                        }
                    },
                "localname":  "LoanAndDepositExpense",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LoansAndLeasesReceivableCommercials":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LoansAndLeasesReceivableGrossCarryingAmount",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of financing receivables before allowance of commercial loans and leases.",
                            "label":  "Loans And Leases Receivable Commercials",
                            "terseLabel":  "Commercial"
                            }
                        }
                    },
                "localname":  "LoansAndLeasesReceivableCommercials",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LoansAndLeasesReceivableConsumers":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LoansAndLeasesReceivableGrossCarryingAmount",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of financing receivables before allowance of consumer loans.",
                            "label":  "Loans And Leases Receivable Consumers",
                            "terseLabel":  "Consumer"
                            }
                        }
                    },
                "localname":  "LoansAndLeasesReceivableConsumers",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LoansAndLeasesReceivableGrossMortgage":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LoansAndLeasesReceivableGrossCarryingAmount",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount before allowance of loan mortgage.  Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts.  Excludes subordinated loans such as home equity lines of credit and loans and leases covered under loss sharing agreements.",
                            "label":  "Loans and Leases Receivable, Gross, Mortgage",
                            "terseLabel":  "Mortgage"
                            }
                        }
                    },
                "localname":  "LoansAndLeasesReceivableGrossMortgage",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LoansAndLeasesReceivableRelatedPartiesActivityOnRevolvingLinesOfCreditNet":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the net activity on revolving lines of credit in respect of loan and lease receivables made to related parties.",
                            "label":  "Loans and Leases Receivable, Related Parties Activity on Revolving Lines of Credit Net",
                            "terseLabel":  "Net activity on revolving lines of credit"
                            }
                        }
                    },
                "localname":  "LoansAndLeasesReceivableRelatedPartiesActivityOnRevolvingLinesOfCreditNet",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansInsiderLoansDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LoansAndLeasesReceivableRelatedPartiesChangeInStatus":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of change in status of insiders relating to loans and leases receivable due from related parties.",
                            "label":  "Loans and Leases Receivable, Related Parties, Change in Status",
                            "terseLabel":  "Change in status of insiders"
                            }
                        }
                    },
                "localname":  "LoansAndLeasesReceivableRelatedPartiesChangeInStatus",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansInsiderLoansDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_LoansAndLeasesReceivableRelatedPartiesUnfundedCommitments":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the amount of unfunded commitments to grant loans or leases to related parties.",
                            "label":  "Loans and Leases Receivable, Related Parties Unfunded Commitments",
                            "terseLabel":  "Unfunded commitments"
                            }
                        }
                    },
                "localname":  "LoansAndLeasesReceivableRelatedPartiesUnfundedCommitments",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansInsiderLoansDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_MBankMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to MBank, the principal banking subsidiary of the entity.",
                            "label":  "M Bank [Member]",
                            "terseLabel":  "Bank"
                            }
                        }
                    },
                "localname":  "MBankMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureCommitmentsContingenciesAndCreditRiskCreditRiskDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansInsiderLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureRegulatoryMattersDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_MinimumCommitmentPeriodRequiredBeforeLoanCommitmentFeesOrCostsAreDeferred":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the minimum commitment period required before loan commitment fees or costs are deferred.",
                            "label":  "Minimum Commitment Period Required before Loan Commitment Fees or Costs are Deferred",
                            "terseLabel":  "Minimum commitment period required before loan commitment fees or costs are deferred"
                            }
                        }
                    },
                "localname":  "MinimumCommitmentPeriodRequiredBeforeLoanCommitmentFeesOrCostsAreDeferred",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "mfnc_MortgageBackedSecuritiesAndMunicipalSecuritiesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the securities collateralized by mortgage loans and municipal securities.",
                            "label":  "Mortgage Backed Securities And Municipal Securities [Member]",
                            "terseLabel":  "Mortgage related and municipal securities"
                            }
                        }
                    },
                "localname":  "MortgageBackedSecuritiesAndMunicipalSecuritiesMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureBorrowingsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_MortgageLoansAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "Mortgage Loans [Abstract]",
                            "terseLabel":  "Mortgage Loans"
                            }
                        }
                    },
                "localname":  "MortgageLoansAbstract",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "mfnc_MortgageLoansServicingObligationAmount":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the amount of mortgage loans the entity has an obligation to service.",
                            "label":  "Mortgage Loans Servicing Obligation, Amount",
                            "terseLabel":  "Balance of loan servicing portfolio"
                            }
                        }
                    },
                "localname":  "MortgageLoansServicingObligationAmount",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_MortgageLoansServicingObligationAsPercentageOfPortfolio":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents the percentage of mortgage loans the entity has an obligation to service.",
                            "label":  "Mortgage Loans Servicing Obligation As A Percentage of Portfolio",
                            "terseLabel":  "Mortgage servicing rights as % of portfolio"
                            }
                        }
                    },
                "localname":  "MortgageLoansServicingObligationAsPercentageOfPortfolio",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "mfnc_MortgageLoansServicingObligationFairValueAmount":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Represents fair value of servicing rights.",
                            "label":  "Mortgage Loans Servicing Obligation Fair Value Amount",
                            "terseLabel":  "Fair value of servicing rights"
                            }
                        }
                    },
                "localname":  "MortgageLoansServicingObligationFairValueAmount",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureServicingRightsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_MortgageServicingIncomesExpenses":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NoninterestIncome",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Incomes or expenses from mortgage services.",
                            "label":  "Mortgage Servicing Incomes Expenses",
                            "terseLabel":  "Net mortgage servicing fees"
                            }
                        }
                    },
                "localname":  "MortgageServicingIncomesExpenses",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_NatureOfOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "No definition available.",
                            "label":  "Nature Of Operations [Abstract]",
                            "terseLabel":  "Nature of Operations"
                            }
                        }
                    },
                "localname":  "NatureOfOperationsAbstract",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "mfnc_NatureOfOperationsPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for the nature of operations of an entity's business.",
                            "label":  "Nature of Operations [Policy Text Block]",
                            "terseLabel":  "Nature of Operations"
                            }
                        }
                    },
                "localname":  "NatureOfOperationsPolicyTextBlock",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "textBlockItemType"
                },
            "mfnc_NiagaraBancorporationMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Information relating to acquisition of Niagara Bancorporation (\"Niagara\"), the holding company for First National Bank of Niagara, headquarter in Niagara, WI.",
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                            "terseLabel":  "Niagara Bancorporation"
                            }
                        }
                    },
                "localname":  "NiagaraBancorporationMember",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansDetails",
                    "http://www.bankmbank.com/role/DisclosureLoansTables"
                    ],
                "xbrltype":  "domainItemType"
                },
            "mfnc_NonaccrualLoansFairValueInputsBlendedInterestRate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The blended interest rate used in determining the fair value of nonaccrual loans.",
                            "label":  "Nonaccrual Loans Fair Value Inputs Blended Interest Rate",
                            "terseLabel":  "Blended interest rate for determining fair value of nonaccrual loans (as a percent)"
                            }
                        }
                    },
                "localname":  "NonaccrualLoansFairValueInputsBlendedInterestRate",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureFairValueDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "mfnc_NowAccountsMoneyMarketAccountsAndCheckingDeposits":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Deposits",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "This element represents NOW, money market, interest checking.",
                            "label":  "Now Accounts Money Market Accounts and Checking Deposits",
                            "terseLabel":  "NOW, money market, interest checking",
                            "verboseLabel":  "NOW, money market, interest checking"
                            }
                        }
                    },
                "localname":  "NowAccountsMoneyMarketAccountsAndCheckingDeposits",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureDepositsDetails",
                    "http://www.bankmbank.com/role/StatementConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "mfnc_NumberOfBankingBorrowingRelationship":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Number of banking borrowing relationships.",
                            "label":  "Number Of Banking Borrowing Relationship",
                            "terseLabel":  "Number of banking borrowing relationships"
                            }
                        }
                    },
                "localname":  "NumberOfBankingBorrowingRelationship",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
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                    ],
                "xbrltype":  "integerItemType"
                },
            "mfnc_NumberOfConsecutiveTimelyPaymentsBeforeBeingConsideredReturnToAccruingStatus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Number of consecutive timely payments before the Company would consider a return of a restructured loan to accruing status in accordance with FDIC guidelines regarding restoration of credits to accrual status.",
                            "label":  "Number of Consecutive Timely Payments Before Being Considered Return To Accruing Status",
                            "terseLabel":  "Number of consecutive timely payments before being considered return to accruing status"
                            }
                        }
                    },
                "localname":  "NumberOfConsecutiveTimelyPaymentsBeforeBeingConsideredReturnToAccruingStatus",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLoansTroubledDebtRestructuringDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "mfnc_NumberOfOperatingLeases":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Number of operating leases.",
                            "label":  "Number Of Operating Leases",
                            "terseLabel":  "Number of operating leases"
                            }
                        }
                    },
                "localname":  "NumberOfOperatingLeases",
                "nsuri":  "http://www.bankmbank.com/20201231",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureLeasesDetails"
                    ],
                "xbrltype":  "decimalItemType"
                },
            "mfnc_NumberOfShareRepurchaseProgramExpired":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
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                            "documentation":  "The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale.  Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.",
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                            }
                        }
                    },
                "localname":  "PaymentsForProceedsFromLoansAndLeases",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
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                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsForRepurchaseOfCommonStock":  {
                "auth_ref":  [
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                    ],
                "calculation":  {
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                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
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                    "en-us":  {
                        "role":  {
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                            "negatedLabel":  "Repurchase of common stock",
                            "negatedTerseLabel":  "Repurchase of common stock"
                            }
                        }
                    },
                "localname":  "PaymentsForRepurchaseOfCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/DisclosureParentCompanyOnlyFinancialStatementsCashFlowsDetails",
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                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsOfDividendsCommonStock":  {
                "auth_ref":  [
                    "r70"
                    ],
                "calculation":  {
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                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.",
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                            "negatedLabel":  "Dividend on common stock"
                            }
                        }
                    },
                "localname":  "PaymentsOfDividendsCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
                "presentation":  [
                    "http://www.bankmbank.com/role/StatementConsolidatedStatementsOfCashFlows"
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                "xbrltype":  "monetaryItemType"
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                    "r61",
                    "r65",
                    "r200"
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                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
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                            "negatedLabel":  "Purchase of securities available for sale"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireAvailableForSaleSecuritiesDebt",
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                "crdr":  "credit",
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                    "en-us":  {
                        "role":  {
                            "documentation":  "The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).",
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                            "negatedLabel":  "Investments in subsidiaries"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireInterestInSubsidiariesAndAffiliates",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
                "presentation":  [
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                "xbrltype":  "monetaryItemType"
                },
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                    "r68",
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                    "en-us":  {
                        "role":  {
                            "documentation":  "The cash outflow to obtain servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio.  Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting.",
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                            }
                        }
                    },
                "localname":  "PaymentsToAcquireMortgageServicingRightsMSR",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
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                    "http://www.bankmbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsDetails"
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                "xbrltype":  "monetaryItemType"
                },
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                    "r67"
                    ],
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                    },
                "crdr":  "credit",
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                    "en-us":  {
                        "role":  {
                            "documentation":  "The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.",
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                            "negatedLabel":  "Capital expenditures"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireProductiveAssets",
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                    "r334",
                    "r352",
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                    "r378",
                    "r391"
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                "lang":  {
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                            "terseLabel":  "RETIREMENT PLAN"
                            }
                        }
                    },
                "localname":  "PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
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                    "r302",
                    "r304",
                    "r305",
                    "r306",
                    "r307",
                    "r308",
                    "r309",
                    "r310",
                    "r311",
                    "r312",
                    "r313",
                    "r314",
                    "r315",
                    "r316",
                    "r317",
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                    "r320",
                    "r321",
                    "r322",
                    "r323",
                    "r324",
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                    "r327",
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                    "r330",
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                    "r337",
                    "r338",
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                    "r340",
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                    "r344",
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                    "r346",
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                    "r349",
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                    "r351",
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                    "r364",
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                    "r388",
                    "r389"
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                        }
                    },
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                    "r330",
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                            }
                        }
                    },
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                "xbrltype":  "domainItemType"
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                    "r408"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Information by plan name for share-based payment arrangement.",
                            "label":  "Plan Name [Axis]"
                            }
                        }
                    },
                "localname":  "PlanNameAxis",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
                "presentation":  [
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                    "en-us":  {
                        "role":  {
                            "documentation":  "Plan name for share-based payment arrangement.",
                            "label":  "Plan Name [Domain]",
                            "terseLabel":  "Plan Name [Domain]"
                            }
                        }
                    },
                "localname":  "PlanNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
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                        "role":  {
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                            "terseLabel":  "Portion at Fair Value Measurement [Member]"
                            }
                        }
                    },
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                            "terseLabel":  "Reclassifications"
                            }
                        }
                    },
                "localname":  "PriorPeriodReclassificationAdjustmentDescription",
                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
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                        }
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                    },
                "crdr":  "debit",
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                            "terseLabel":  "Net decrease in interest-bearing deposits in other financial institutions"
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                        }
                    },
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                    },
                "crdr":  "debit",
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                    "en-us":  {
                        "role":  {
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                            "terseLabel":  "Proceeds from sale of loans in the secondary market"
                            }
                        }
                    },
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                "nsuri":  "http://fasb.org/us-gaap/2020-01-31",
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                    "r62",
                    "r200"
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                "calculation":  {
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                    },
                "crdr":  "debit",
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                            "terseLabel":  "Proceeds from maturities, sales, calls or paydowns of securities available for sale"
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                        }
                    },
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                    "en-us":  {
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                            }
                        }
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}

4 Subsequent Filings that Reference this Filing

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

 6/09/21  Mackinac Financial Corp./MI       DEFM14A                1:4.2M                                   Toppan Merrill/FA
 6/09/21  Nicolet Bankshares Inc.           424B3                  1:3.1M                                   Toppan Merrill/FA
 6/01/21  Nicolet Bankshares Inc.           S-4/A                  6:6.4M                                   Toppan Merrill/FA
 5/19/21  Nicolet Bankshares Inc.           S-4                    7:3.1M                                   Toppan Merrill/FA

8 Previous Filings that this Filing References

  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

10/01/18  Mackinac Financial Corp./MI       8-K:8,9    10/01/18    2:43K                                    Toppan Merrill/FA
 5/18/18  Mackinac Financial Corp./MI       8-K:2,8,9   5/18/18    2:57K                                    Toppan Merrill/FA
 3/15/18  Mackinac Financial Corp./MI       10-K       12/31/17  105:28M                                    Toppan Merrill Bridge/FA
 2/13/18  Mackinac Financial Corp./MI       8-K:1,9     2/08/18    2:48K                                    Toppan Merrill/FA
 1/19/18  Mackinac Financial Corp./MI       425                    2:630K Mackinac Financial Corp./MI       Toppan Merrill-FA
 3/24/14  Mackinac Financial Corp./MI       8-K:1,5,9   3/18/14    3:209K                                   Toppan Merrill/FA
 4/25/12  Mackinac Financial Corp./MI       DEF 14A     5/22/12    1:568K                                   Donnelley … Solutions/FA
 3/31/09  Mackinac Financial Corp./MI       10-K       12/31/08   11:1.9M                                   Bowne BCL/FA

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Filing Submission 0001558370-21-002868 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Mackinac Financial Corp./MI – ‘10-K’ for 12/31/20 – ‘JSON’

On: Friday, 3/12/21, at 10:52am ET · For: 12/31/20 · Accession #: 1558370-21-2868 · File #: 0-20167

Annual Report — Form 10-KFiling Table of Contents

‘JSON’ — XBRL Instance as JSON Data — MetaLinks

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4 Subsequent Filings that Reference this Filing

8 Previous Filings that this Filing References

Annual Report — Form 10-K
Filing Table of Contents