i 0001212545 i 2023 i Q3 i FALSE i --12-3100012125452023-01-012023-09-30
0001212545us-gaap:CommonStockMember2023-01-012023-09-30
0001212545us-gaap:NoncumulativePreferredStockMember2023-01-012023-09-30
00012125452023-10-27xbrli:shares
00012125452023-09-30iso4217:USD
00012125452022-12-31iso4217:USDxbrli:shares
00012125452023-07-012023-09-30
00012125452022-07-012022-09-30
00012125452022-01-012022-09-30
0001212545wal:CreditLinkedNotesMember2023-01-012023-09-30
0001212545us-gaap:PreferredStockMember2022-06-30
0001212545us-gaap:CommonStockMember2022-06-30
0001212545us-gaap:AdditionalPaidInCapitalMember2022-06-30
0001212545us-gaap:TreasuryStockCommonMember2022-06-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-30
0001212545us-gaap:RetainedEarningsMember2022-06-30
00012125452022-06-30
0001212545us-gaap:RetainedEarningsMember2022-07-012022-09-30
0001212545us-gaap:AdditionalPaidInCapitalMember2022-07-012022-09-30
0001212545us-gaap:TreasuryStockCommonMember2022-07-012022-09-30
0001212545us-gaap:CommonStockMember2022-07-012022-09-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-07-012022-09-30
0001212545us-gaap:PreferredStockMember2022-09-30
0001212545us-gaap:CommonStockMember2022-09-30
0001212545us-gaap:AdditionalPaidInCapitalMember2022-09-30
0001212545us-gaap:TreasuryStockCommonMember2022-09-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-09-30
0001212545us-gaap:RetainedEarningsMember2022-09-30
00012125452022-09-30
0001212545us-gaap:PreferredStockMember2023-06-30
0001212545us-gaap:CommonStockMember2023-06-30
0001212545us-gaap:AdditionalPaidInCapitalMember2023-06-30
0001212545us-gaap:TreasuryStockCommonMember2023-06-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-06-30
0001212545us-gaap:RetainedEarningsMember2023-06-30
00012125452023-06-30
0001212545us-gaap:RetainedEarningsMember2023-07-012023-09-30
0001212545us-gaap:AdditionalPaidInCapitalMember2023-07-012023-09-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-07-012023-09-30
0001212545us-gaap:PreferredStockMember2023-09-30
0001212545us-gaap:CommonStockMember2023-09-30
0001212545us-gaap:AdditionalPaidInCapitalMember2023-09-30
0001212545us-gaap:TreasuryStockCommonMember2023-09-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-09-30
0001212545us-gaap:RetainedEarningsMember2023-09-30
0001212545us-gaap:PreferredStockMember2021-12-31
0001212545us-gaap:CommonStockMember2021-12-31
0001212545us-gaap:AdditionalPaidInCapitalMember2021-12-31
0001212545us-gaap:TreasuryStockCommonMember2021-12-31
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-31
0001212545us-gaap:RetainedEarningsMember2021-12-31
00012125452021-12-31
0001212545us-gaap:RetainedEarningsMember2022-01-012022-09-30
0001212545us-gaap:CommonStockMember2022-01-012022-09-30
0001212545us-gaap:AdditionalPaidInCapitalMember2022-01-012022-09-30
0001212545us-gaap:TreasuryStockCommonMember2022-01-012022-09-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-09-30
0001212545us-gaap:PreferredStockMember2022-12-31
0001212545us-gaap:CommonStockMember2022-12-31
0001212545us-gaap:AdditionalPaidInCapitalMember2022-12-31
0001212545us-gaap:TreasuryStockCommonMember2022-12-31
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-31
0001212545us-gaap:RetainedEarningsMember2022-12-31
0001212545us-gaap:RetainedEarningsMember2023-01-012023-09-30
0001212545us-gaap:CommonStockMember2023-01-012023-09-30
0001212545us-gaap:AdditionalPaidInCapitalMember2023-01-012023-09-30
0001212545us-gaap:TreasuryStockCommonMember2023-01-012023-09-30
0001212545us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-09-30wal:Subsidiary
0001212545wal:CommercialSegmentMember2023-09-30
0001212545wal:ConsumerRelatedSegmentMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMember2023-09-30
0001212545us-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMember2023-09-30
0001212545wal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545us-gaap:CorporateBondSecuritiesMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2023-09-30
0001212545us-gaap:USTreasurySecuritiesMember2023-09-30
0001212545us-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMember2022-12-31
0001212545us-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMember2022-12-31
0001212545wal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545us-gaap:CorporateBondSecuritiesMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2022-12-31
0001212545us-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545us-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545us-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:CorporateBondSecuritiesWithACLMember2023-09-30wal:security
0001212545us-gaap:NontaxableMunicipalBondsMember2023-06-30
0001212545us-gaap:NontaxableMunicipalBondsMember2023-07-012023-09-30
0001212545us-gaap:NontaxableMunicipalBondsMember2023-01-012023-09-30
0001212545us-gaap:NontaxableMunicipalBondsMember2022-06-30
0001212545us-gaap:NontaxableMunicipalBondsMember2022-07-012022-09-30
0001212545us-gaap:NontaxableMunicipalBondsMember2022-09-30
0001212545us-gaap:NontaxableMunicipalBondsMember2021-12-31
0001212545us-gaap:NontaxableMunicipalBondsMember2022-01-012022-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorAaaMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorUnratedMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545us-gaap:NontaxableMunicipalBondsMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545us-gaap:NontaxableMunicipalBondsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaaMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorAaaMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2023-09-30
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorUnratedMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaaMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545wal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorAaaMember2023-09-30
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:CorporateBondSecuritiesMember2023-09-30
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2023-09-30
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:CorporateBondSecuritiesMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorAaaMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2023-09-30
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545us-gaap:USTreasurySecuritiesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545us-gaap:OtherAggregatedInvestmentsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorAaaMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2023-09-30
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorUnratedMember2023-09-30
0001212545wal:CraInvestmentsMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:PreferredStockMember2023-09-30
0001212545us-gaap:PreferredStockMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2023-09-30
0001212545us-gaap:PreferredStockMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:PreferredStockMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:PreferredStockMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:PreferredStockMember2023-09-30
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:PreferredStockMember2023-09-30
0001212545us-gaap:PreferredStockMember2023-09-30
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2022-12-31
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545us-gaap:ResidentialMortgageBackedSecuritiesMemberwal:CorporateCreditQualityIndicatorUnratedMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545us-gaap:NontaxableMunicipalBondsMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:NontaxableMunicipalBondsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545us-gaap:CollateralizedLoanObligationsMemberwal:CorporateCreditQualityIndicatorUnratedMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAaaMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545wal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:CorporateBondSecuritiesMember2022-12-31
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545us-gaap:CorporateBondSecuritiesMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:CorporateBondSecuritiesMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545us-gaap:OtherAggregatedInvestmentsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545us-gaap:CommonStockMemberwal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545us-gaap:CommonStockMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:CommonStockMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545us-gaap:CommonStockMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2022-12-31
0001212545us-gaap:CommonStockMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545us-gaap:CommonStockMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:CommonStockMember2022-12-31
0001212545us-gaap:CommonStockMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorAaaMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorAPlusToAMinusMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorBbPlusAndBelowMember2022-12-31
0001212545wal:CraInvestmentsMemberwal:CorporateCreditQualityIndicatorUnratedMember2022-12-31
0001212545wal:CraInvestmentsMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAaaMemberus-gaap:PreferredStockMember2022-12-31
0001212545us-gaap:PreferredStockMemberwal:CorporateCreditQualityIndicatorSplitAaaToAaPlusMember2022-12-31
0001212545us-gaap:PreferredStockMemberwal:CorporateCreditQualityIndicatorAaPlusToAaMinusMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorAPlusToAMinusMemberus-gaap:PreferredStockMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbbPlusToBbbMinusMemberus-gaap:PreferredStockMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorBbPlusAndBelowMemberus-gaap:PreferredStockMember2022-12-31
0001212545wal:CorporateCreditQualityIndicatorUnratedMemberus-gaap:PreferredStockMember2022-12-31
0001212545us-gaap:PreferredStockMember2022-12-31
00012125452023-01-012023-03-31
0001212545wal:PurchasedFromGinnieMaeMember2023-09-30
0001212545wal:PurchasedFromGinnieMaeMember2022-12-31
0001212545wal:PurchasedFromCorrespondentSellerMember2023-09-30
0001212545wal:PurchasedFromCorrespondentSellerMember2022-12-31
0001212545us-gaap:LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember2023-09-30
0001212545us-gaap:LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember2022-12-31
0001212545us-gaap:UsGovernmentAgencyInsuredLoansMember2023-09-30
0001212545us-gaap:UsGovernmentAgencyInsuredLoansMember2022-12-31
0001212545us-gaap:LoansInsuredOrGuaranteedByNonUsGovernmentAuthoritiesMember2023-09-30
0001212545us-gaap:LoansInsuredOrGuaranteedByNonUsGovernmentAuthoritiesMember2022-12-31
0001212545wal:WarehouselendingMember2023-09-30
0001212545wal:WarehouselendingMember2022-12-31
0001212545wal:MunicipalandnonprofitMember2023-09-30
0001212545wal:MunicipalandnonprofitMember2022-12-31
0001212545wal:TechInnovationMember2023-09-30
0001212545wal:TechInnovationMember2022-12-31
0001212545wal:EquityFundResourcesMember2023-09-30
0001212545wal:EquityFundResourcesMember2022-12-31
0001212545wal:OthercommercialandindustrialMember2023-09-30
0001212545wal:OthercommercialandindustrialMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2022-12-31
0001212545wal:HotelfranchisefinanceMember2023-09-30
0001212545wal:HotelfranchisefinanceMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2022-12-31
0001212545us-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:ResidentialRealEstateMember2022-12-31
0001212545wal:ResidentialEBOMember2023-09-30
0001212545wal:ResidentialEBOMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentLandMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentLandMember2022-12-31
0001212545wal:OtherLoanSegmentMember2023-09-30
0001212545wal:OtherLoanSegmentMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMember2022-12-31
0001212545wal:WarehouselendingMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:WarehouselendingMember2023-09-30
0001212545wal:WarehouselendingMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:WarehouselendingMember2023-09-30
0001212545wal:WarehouselendingMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:MunicipalandnonprofitMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:MunicipalandnonprofitMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:TechInnovationMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:TechInnovationMember2023-09-30
0001212545wal:TechInnovationMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:TechInnovationMember2023-09-30
0001212545wal:TechInnovationMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:OthercommercialandindustrialMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:OthercommercialandindustrialMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:CommercialRealEstateOwnerOccupiedMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:CommercialRealEstateOwnerOccupiedMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:HotelfranchisefinanceMember2023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:HotelfranchisefinanceMember2023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545us-gaap:FinancialAssetNotPastDueMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:FinancingReceivables60To89DaysPastDueMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:FinancialAssetPastDueMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545wal:ResidentialEBOMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:ResidentialEBOMember2023-09-30
0001212545wal:ResidentialEBOMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:ResidentialEBOMember2023-09-30
0001212545wal:ResidentialEBOMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:ConstructionAndLandDevelopmentMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:ConstructionAndLandDevelopmentMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMember2023-09-30
0001212545wal:OtherLoanSegmentMemberus-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:OtherLoanSegmentMember2023-09-30
0001212545wal:OtherLoanSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:OtherLoanSegmentMember2023-09-30
0001212545wal:OtherLoanSegmentMemberus-gaap:FinancialAssetPastDueMember2023-09-30
0001212545us-gaap:FinancialAssetNotPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivables60To89DaysPastDueMember2023-09-30
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2023-09-30
0001212545us-gaap:FinancialAssetPastDueMember2023-09-30
0001212545wal:WarehouselendingMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:WarehouselendingMember2022-12-31
0001212545wal:WarehouselendingMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:WarehouselendingMember2022-12-31
0001212545wal:WarehouselendingMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:MunicipalandnonprofitMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:MunicipalandnonprofitMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:TechInnovationMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:TechInnovationMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:OthercommercialandindustrialMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:OthercommercialandindustrialMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:CommercialRealEstateOwnerOccupiedMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:CommercialRealEstateOwnerOccupiedMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:HotelfranchisefinanceMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:HotelfranchisefinanceMember2022-12-31
0001212545wal:HotelfranchisefinanceMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:HotelfranchisefinanceMember2022-12-31
0001212545wal:HotelfranchisefinanceMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545us-gaap:FinancialAssetNotPastDueMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545us-gaap:FinancingReceivables60To89DaysPastDueMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545us-gaap:FinancialAssetPastDueMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545wal:ResidentialEBOMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:ResidentialEBOMember2022-12-31
0001212545wal:ResidentialEBOMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:ResidentialEBOMember2022-12-31
0001212545wal:ResidentialEBOMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:ConstructionAndLandDevelopmentMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:ConstructionAndLandDevelopmentMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:OtherLoanSegmentMemberus-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMemberwal:OtherLoanSegmentMember2022-12-31
0001212545wal:OtherLoanSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberwal:OtherLoanSegmentMember2022-12-31
0001212545wal:OtherLoanSegmentMemberus-gaap:FinancialAssetPastDueMember2022-12-31
0001212545us-gaap:FinancialAssetNotPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables30To59DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivables60To89DaysPastDueMember2022-12-31
0001212545us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2022-12-31
0001212545us-gaap:FinancialAssetPastDueMember2022-12-31
0001212545wal:WarehouselendingMemberus-gaap:PassMember2023-09-30
0001212545wal:WarehouselendingMemberus-gaap:SpecialMentionMember2023-09-30
0001212545us-gaap:SubstandardMemberwal:WarehouselendingMember2023-09-30
0001212545wal:WarehouselendingMember2023-01-012023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:PassMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:SpecialMentionMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:SubstandardMember2023-09-30
0001212545wal:MunicipalandnonprofitMember2023-01-012023-09-30
0001212545wal:TechInnovationMemberus-gaap:PassMember2023-09-30
0001212545wal:TechInnovationMemberus-gaap:SpecialMentionMember2023-09-30
0001212545wal:TechInnovationMemberus-gaap:SubstandardMember2023-09-30
0001212545wal:TechInnovationMember2023-01-012023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:PassMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:SpecialMentionMember2023-09-30
0001212545wal:EquityFundResourcesMemberus-gaap:SubstandardMember2023-09-30
0001212545wal:EquityFundResourcesMember2023-01-012023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:PassMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:SpecialMentionMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:SubstandardMember2023-09-30
0001212545wal:OthercommercialandindustrialMember2023-01-012023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:PassMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:SpecialMentionMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:SubstandardMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2023-01-012023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:PassMember2023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:SpecialMentionMember2023-09-30
0001212545us-gaap:SubstandardMemberwal:HotelfranchisefinanceMember2023-09-30
0001212545wal:HotelfranchisefinanceMember2023-01-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:PassMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:SpecialMentionMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:SubstandardMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2023-01-012023-09-30
0001212545us-gaap:PassMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:SpecialMentionMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:SubstandardMemberus-gaap:ResidentialRealEstateMember2023-09-30
0001212545us-gaap:ResidentialRealEstateMember2023-01-012023-09-30
0001212545wal:ResidentialEBOMemberus-gaap:PassMember2023-09-30
0001212545wal:ResidentialEBOMemberus-gaap:SpecialMentionMember2023-09-30
0001212545us-gaap:SubstandardMemberwal:ResidentialEBOMember2023-09-30
0001212545wal:ResidentialEBOMember2023-01-012023-09-30
0001212545wal:ConstructionAndLandDevelopmentLandMemberus-gaap:PassMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentLandMemberus-gaap:SpecialMentionMember2023-09-30
0001212545us-gaap:SubstandardMemberwal:ConstructionAndLandDevelopmentLandMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentLandMember2023-01-012023-09-30
0001212545wal:OtherLoanSegmentMemberus-gaap:PassMember2023-09-30
0001212545wal:OtherLoanSegmentMemberus-gaap:SpecialMentionMember2023-09-30
0001212545us-gaap:SubstandardMemberwal:OtherLoanSegmentMember2023-09-30
0001212545wal:OtherLoanSegmentMember2023-01-012023-09-30
0001212545us-gaap:PassMember2023-09-30
0001212545us-gaap:SpecialMentionMember2023-09-30
0001212545us-gaap:SubstandardMember2023-09-30
0001212545wal:WarehouselendingMemberus-gaap:PassMember2022-12-31
0001212545wal:WarehouselendingMemberus-gaap:SpecialMentionMember2022-12-31
0001212545us-gaap:SubstandardMemberwal:WarehouselendingMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:PassMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:SpecialMentionMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:SubstandardMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:PassMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:SpecialMentionMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:SubstandardMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:PassMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:SpecialMentionMember2022-12-31
0001212545wal:EquityFundResourcesMemberus-gaap:SubstandardMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:PassMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:SpecialMentionMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:SubstandardMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:PassMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:SpecialMentionMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:SubstandardMember2022-12-31
0001212545wal:HotelfranchisefinanceMemberus-gaap:PassMember2022-12-31
0001212545wal:HotelfranchisefinanceMemberus-gaap:SpecialMentionMember2022-12-31
0001212545us-gaap:SubstandardMemberwal:HotelfranchisefinanceMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:PassMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:SpecialMentionMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:SubstandardMember2022-12-31
0001212545us-gaap:PassMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545us-gaap:SpecialMentionMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545us-gaap:SubstandardMemberus-gaap:ResidentialRealEstateMember2022-12-31
0001212545wal:ResidentialEBOMemberus-gaap:PassMember2022-12-31
0001212545wal:ResidentialEBOMemberus-gaap:SpecialMentionMember2022-12-31
0001212545us-gaap:SubstandardMemberwal:ResidentialEBOMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentLandMemberus-gaap:PassMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentLandMemberus-gaap:SpecialMentionMember2022-12-31
0001212545us-gaap:SubstandardMemberwal:ConstructionAndLandDevelopmentLandMember2022-12-31
0001212545wal:OtherLoanSegmentMemberus-gaap:PassMember2022-12-31
0001212545wal:OtherLoanSegmentMemberus-gaap:SpecialMentionMember2022-12-31
0001212545us-gaap:SubstandardMemberwal:OtherLoanSegmentMember2022-12-31
0001212545us-gaap:PassMember2022-12-31
0001212545us-gaap:SpecialMentionMember2022-12-31
0001212545us-gaap:SubstandardMember2022-12-31
0001212545wal:TechInnovationMemberwal:PaymentDeferralAndExtendedMaturityMember2023-07-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:TechInnovationMember2023-07-012023-09-30
0001212545wal:TechInnovationMemberus-gaap:PaymentDeferralMember2023-07-012023-09-30
0001212545wal:TechInnovationMember2023-07-012023-09-30xbrli:pure
0001212545wal:OthercommercialandindustrialMemberwal:PaymentDeferralAndExtendedMaturityMember2023-07-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:OthercommercialandindustrialMember2023-07-012023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:PaymentDeferralMember2023-07-012023-09-30
0001212545wal:OthercommercialandindustrialMember2023-07-012023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberwal:PaymentDeferralAndExtendedMaturityMember2023-07-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:CommercialRealEstateOwnerOccupiedMember2023-07-012023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:PaymentDeferralMember2023-07-012023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2023-07-012023-09-30
0001212545wal:HotelfranchisefinanceMemberwal:PaymentDeferralAndExtendedMaturityMember2023-07-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:HotelfranchisefinanceMember2023-07-012023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:PaymentDeferralMember2023-07-012023-09-30
0001212545wal:HotelfranchisefinanceMember2023-07-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberwal:PaymentDeferralAndExtendedMaturityMember2023-07-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:ExtendedMaturityMember2023-07-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:PaymentDeferralMember2023-07-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2023-07-012023-09-30
0001212545wal:PaymentDeferralAndExtendedMaturityMember2023-07-012023-09-30
0001212545us-gaap:ExtendedMaturityMember2023-07-012023-09-30
0001212545us-gaap:PaymentDeferralMember2023-07-012023-09-30
0001212545wal:TechInnovationMemberwal:PaymentDeferralAndExtendedMaturityMember2023-01-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:TechInnovationMember2023-01-012023-09-30
0001212545wal:TechInnovationMemberus-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:OthercommercialandindustrialMemberwal:PaymentDeferralAndExtendedMaturityMember2023-01-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:OthercommercialandindustrialMember2023-01-012023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberwal:PaymentDeferralAndExtendedMaturityMember2023-01-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:CommercialRealEstateOwnerOccupiedMember2023-01-012023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:HotelfranchisefinanceMemberwal:PaymentDeferralAndExtendedMaturityMember2023-01-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberwal:HotelfranchisefinanceMember2023-01-012023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberwal:PaymentDeferralAndExtendedMaturityMember2023-01-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:ExtendedMaturityMember2023-01-012023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:PaymentDeferralAndExtendedMaturityMemberus-gaap:ResidentialRealEstateMember2023-01-012023-09-30
0001212545us-gaap:ExtendedMaturityMemberus-gaap:ResidentialRealEstateMember2023-01-012023-09-30
0001212545us-gaap:ResidentialRealEstateMemberus-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:PaymentDeferralAndExtendedMaturityMember2023-01-012023-09-30
0001212545us-gaap:ExtendedMaturityMember2023-01-012023-09-30
0001212545us-gaap:PaymentDeferralMember2023-01-012023-09-30
0001212545wal:ResidentialEBOMember2023-07-012023-09-30wal:SecurityLoan
0001212545wal:MunicipalandnonprofitMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:MunicipalandnonprofitMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:MunicipalandnonprofitMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:TechInnovationMemberwal:RealEstateCollateralMember2023-09-30
0001212545wal:TechInnovationMemberwal:OtherCollateralMember2023-09-30
0001212545wal:TechInnovationMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:TechInnovationMemberwal:RealEstateCollateralMember2022-12-31
0001212545wal:TechInnovationMemberwal:OtherCollateralMember2022-12-31
0001212545wal:TechInnovationMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OthercommercialandindustrialMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OthercommercialandindustrialMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:RealEstateCollateralMemberwal:CommercialRealEstateOwnerOccupiedMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:RealEstateCollateralMemberwal:CommercialRealEstateOwnerOccupiedMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:RealEstateCollateralMemberwal:HotelfranchisefinanceMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OtherCollateralMemberwal:HotelfranchisefinanceMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:HotelfranchisefinanceMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:RealEstateCollateralMemberwal:HotelfranchisefinanceMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OtherCollateralMemberwal:HotelfranchisefinanceMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:HotelfranchisefinanceMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:ConstructionAndLandDevelopmentMemberwal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMemberwal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:ConstructionAndLandDevelopmentMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2023-09-30
0001212545wal:RealEstateCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:OtherCollateralMemberus-gaap:AssetPledgedAsCollateralMember2022-12-31
0001212545wal:WarehouselendingMember2023-06-30
0001212545wal:WarehouselendingMember2023-07-012023-09-30
0001212545wal:MunicipalandnonprofitMember2023-06-30
0001212545wal:MunicipalandnonprofitMember2023-07-012023-09-30
0001212545wal:TechInnovationMember2023-06-30
0001212545wal:EquityFundResourcesMember2023-06-30
0001212545wal:EquityFundResourcesMember2023-07-012023-09-30
0001212545wal:OthercommercialandindustrialMember2023-06-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2023-06-30
0001212545wal:HotelfranchisefinanceMember2023-06-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2023-06-30
0001212545us-gaap:ResidentialRealEstateMember2023-06-30
0001212545us-gaap:ResidentialRealEstateMember2023-07-012023-09-30
0001212545wal:ResidentialEBOMember2023-06-30
0001212545wal:ConstructionAndLandDevelopmentMember2023-06-30
0001212545wal:ConstructionAndLandDevelopmentMember2023-07-012023-09-30
0001212545wal:OtherLoanSegmentMember2023-06-30
0001212545wal:OtherLoanSegmentMember2023-07-012023-09-30
0001212545wal:ConstructionAndLandDevelopmentMember2023-01-012023-09-30
0001212545wal:WarehouselendingMember2022-06-30
0001212545wal:WarehouselendingMember2022-07-012022-09-30
0001212545wal:WarehouselendingMember2022-09-30
0001212545wal:MunicipalandnonprofitMember2022-06-30
0001212545wal:MunicipalandnonprofitMember2022-07-012022-09-30
0001212545wal:MunicipalandnonprofitMember2022-09-30
0001212545wal:TechInnovationMember2022-06-30
0001212545wal:TechInnovationMember2022-07-012022-09-30
0001212545wal:TechInnovationMember2022-09-30
0001212545wal:EquityFundResourcesMember2022-06-30
0001212545wal:EquityFundResourcesMember2022-07-012022-09-30
0001212545wal:EquityFundResourcesMember2022-09-30
0001212545wal:OthercommercialandindustrialMember2022-06-30
0001212545wal:OthercommercialandindustrialMember2022-07-012022-09-30
0001212545wal:OthercommercialandindustrialMember2022-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2022-06-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2022-07-012022-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2022-09-30
0001212545wal:HotelfranchisefinanceMember2022-06-30
0001212545wal:HotelfranchisefinanceMember2022-07-012022-09-30
0001212545wal:HotelfranchisefinanceMember2022-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2022-06-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2022-07-012022-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2022-09-30
0001212545us-gaap:ResidentialRealEstateMember2022-06-30
0001212545us-gaap:ResidentialRealEstateMember2022-07-012022-09-30
0001212545us-gaap:ResidentialRealEstateMember2022-09-30
0001212545wal:ConstructionAndLandDevelopmentMember2022-06-30
0001212545wal:ConstructionAndLandDevelopmentMember2022-07-012022-09-30
0001212545wal:ConstructionAndLandDevelopmentMember2022-09-30
0001212545wal:OtherLoanSegmentMember2022-06-30
0001212545wal:OtherLoanSegmentMember2022-07-012022-09-30
0001212545wal:OtherLoanSegmentMember2022-09-30
0001212545wal:WarehouselendingMember2021-12-31
0001212545wal:WarehouselendingMember2022-01-012022-09-30
0001212545wal:MunicipalandnonprofitMember2021-12-31
0001212545wal:MunicipalandnonprofitMember2022-01-012022-09-30
0001212545wal:TechInnovationMember2021-12-31
0001212545wal:TechInnovationMember2022-01-012022-09-30
0001212545wal:EquityFundResourcesMember2021-12-31
0001212545wal:EquityFundResourcesMember2022-01-012022-09-30
0001212545wal:OthercommercialandindustrialMember2021-12-31
0001212545wal:OthercommercialandindustrialMember2022-01-012022-09-30
0001212545wal:CommercialRealEstateOwnerOccupiedMember2021-12-31
0001212545wal:CommercialRealEstateOwnerOccupiedMember2022-01-012022-09-30
0001212545wal:HotelfranchisefinanceMember2021-12-31
0001212545wal:HotelfranchisefinanceMember2022-01-012022-09-30
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2021-12-31
0001212545wal:OtherCommercialRealEstateNonownerOccupiedMember2022-01-012022-09-30
0001212545us-gaap:ResidentialRealEstateMember2021-12-31
0001212545us-gaap:ResidentialRealEstateMember2022-01-012022-09-30
0001212545wal:ConstructionAndLandDevelopmentMember2021-12-31
0001212545wal:ConstructionAndLandDevelopmentMember2022-01-012022-09-30
0001212545wal:OtherLoanSegmentMember2021-12-31
0001212545wal:OtherLoanSegmentMember2022-01-012022-09-30
0001212545wal:FinancingReceivablePurchaseMember2023-07-012023-09-30
0001212545wal:FinancingReceivablePurchaseMember2023-01-012023-09-30
0001212545wal:FinancingReceivablePurchaseMember2022-07-012022-09-30
0001212545wal:FinancingReceivablePurchaseMember2022-01-012022-09-30
00012125452023-04-012023-09-30
0001212545us-gaap:ServicingContractsMember2023-07-012023-09-30
0001212545us-gaap:ServicingContractsMember2023-01-012023-09-30
0001212545us-gaap:ServicingContractsMember2022-07-012022-09-30
0001212545us-gaap:ServicingContractsMember2022-01-012022-09-30
0001212545wal:BTFPAdvancesMember2023-09-30
0001212545wal:BTFPAdvancesMember2022-12-31
0001212545wal:ShortTermDebtSecuredMember2023-09-30
0001212545wal:ShortTermDebtSecuredMember2022-12-31
0001212545us-gaap:RevolvingCreditFacilityMember2023-09-30
0001212545srt:MinimumMemberus-gaap:FederalFundsEffectiveSwapRateMember2023-01-012023-09-30
0001212545srt:MaximumMemberus-gaap:FederalFundsEffectiveSwapRateMember2023-01-012023-09-30
0001212545us-gaap:FederalHomeLoanBankAdvancesMember2023-09-30
0001212545us-gaap:FederalHomeLoanBankAdvancesMember2022-12-31
0001212545wal:FederalReserveBankBTFPAdvancesMemberus-gaap:FederalFundsEffectiveSwapRateMember2023-01-012023-09-30
0001212545wal:FederalReserveBankBTFPAdvancesMember2023-09-30
0001212545us-gaap:FederalReserveBankAdvancesMember2023-09-30
0001212545us-gaap:FederalReserveBankAdvancesMember2022-12-31
0001212545us-gaap:WarehouseAgreementBorrowingsMember2023-09-30
0001212545wal:SecuritiesRepurchaseAgreementsMember2022-12-31
0001212545wal:EarlyBuyoutRepurchaseAgreementsMember2023-09-30
0001212545wal:EarlyBuyoutRepurchaseAgreementsMember2023-09-30
0001212545wal:EarlyBuyoutRepurchaseAgreementsMember2022-12-31
0001212545wal:CustomerRepurchaseAgreementsMember2023-09-30
0001212545wal:CustomerRepurchaseAgreementsMember2022-12-31
0001212545wal:CustomerRepurchaseAgreementsMember2023-09-30
0001212545wal:CustomerRepurchaseAgreementsMember2022-12-31
0001212545us-gaap:SecuredDebtMember2023-09-30
0001212545us-gaap:SecuredDebtMember2022-12-31
0001212545us-gaap:SeniorNotesMember2020-09-30
0001212545us-gaap:SeniorNotesMember2023-09-30
0001212545us-gaap:DebtInstrumentRedemptionPeriodOneMemberus-gaap:SeniorNotesMember2023-01-012023-09-30
0001212545us-gaap:SeniorNotesMemberus-gaap:DebtInstrumentRedemptionPeriodTwoMember2023-01-012023-09-30
0001212545wal:CreditLinkedNotesMaturingOctober2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-12-31
0001212545wal:CreditLinkedNotesMaturingOctober2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingOctober2052Member2023-09-30
0001212545wal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-09-30
0001212545wal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-12-31
0001212545wal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMember2023-09-30
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-09-30
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-12-31
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Member2023-09-30
0001212545wal:CreditLinkedNotesMember2023-09-30
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingOctober2052Member2022-12-31
0001212545wal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMember2022-12-31
0001212545wal:CreditLinkedNotesMaturingJune2028Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2022-01-012022-12-31
0001212545wal:CreditLinkedNotesMaturingJune2028Memberwal:CreditLinkedNotesMember2022-12-31
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Member2022-12-31
0001212545wal:LondonInterbankOfferedRateLIBORSwapRate1Memberwal:CreditLinkedNotesMaturingDecember2024Memberwal:CreditLinkedNotesMember2022-01-012022-12-31
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingDecember2024Member2022-12-31
0001212545wal:CreditLinkedNotesMember2022-12-31
0001212545srt:MinimumMemberwal:CreditLinkedNotesMaturingOctober2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545srt:MaximumMemberwal:CreditLinkedNotesMaturingOctober2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545wal:CreditLinkedNotesMaturingOctober2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-30
0001212545srt:MinimumMemberwal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545srt:MaximumMemberwal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545wal:CreditLinkedNotesMaturingApril2052Memberwal:CreditLinkedNotesMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-30
0001212545srt:MinimumMemberwal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545srt:MaximumMemberwal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545wal:CreditLinkedNotesMemberwal:CreditLinkedNotesMaturingJuly2059Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-09-30
0001212545wal:SubordinatedDebenturesMaturingJune2031Memberus-gaap:SubordinatedDebtMember2023-09-30
0001212545us-gaap:SubordinatedDebtMemberwal:SubordinatedDebenturesMaturingJune2030Member2023-09-30
0001212545us-gaap:SubordinatedDebtMember2023-09-30
0001212545wal:SubordinatedDebenturesMaturingJune2031Memberus-gaap:SubordinatedDebtMember2022-12-31
0001212545us-gaap:SubordinatedDebtMemberwal:SubordinatedDebenturesMaturingJune2030Member2022-12-31
0001212545us-gaap:SubordinatedDebtMember2022-12-31
0001212545wal:SubordinatedDebenturesMaturingJune2031Member2023-01-012023-09-30
0001212545wal:SubordinatedDebenturesMaturingJune2031Memberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545wal:SubordinatedDebenturesMaturingJune2030Member2023-01-012023-09-30
0001212545us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMemberwal:SubordinatedDebenturesMaturingJune2030Member2023-01-012023-09-30wal:Trust
0001212545us-gaap:JuniorSubordinatedDebtMember2023-09-30
0001212545us-gaap:JuniorSubordinatedDebtMemberus-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember2023-01-012023-09-30
0001212545us-gaap:BaseRateMemberus-gaap:JuniorSubordinatedDebtMember2023-01-012023-09-30
0001212545us-gaap:JuniorSubordinatedDebtMember2022-12-31
0001212545us-gaap:ShareBasedPaymentArrangementEmployeeMemberus-gaap:RestrictedStockMember2023-01-012023-09-30
0001212545us-gaap:ShareBasedPaymentArrangementNonemployeeMemberus-gaap:RestrictedStockMember2023-01-012023-09-30
0001212545us-gaap:RestrictedStockMember2023-07-012023-09-30
0001212545us-gaap:RestrictedStockMember2023-01-012023-09-30
0001212545us-gaap:RestrictedStockMember2022-07-012022-09-30
0001212545us-gaap:RestrictedStockMember2022-01-012022-09-30
0001212545us-gaap:PerformanceSharesMember2023-01-012023-09-30
0001212545us-gaap:PerformanceSharesMember2023-07-012023-09-30
0001212545us-gaap:PerformanceSharesMember2023-01-012023-03-31
0001212545us-gaap:PerformanceSharesMember2022-07-012022-09-30
0001212545us-gaap:PerformanceSharesMember2022-01-012022-09-30
0001212545us-gaap:PerformanceSharesMemberwal:GrantYear2020Member2023-01-012023-03-31
0001212545wal:GrantYear2019Memberus-gaap:PerformanceSharesMember2022-01-012022-03-31
0001212545us-gaap:SeriesAPreferredStockMember2023-09-30
0001212545wal:ATMOfferingMember2022-07-012022-09-30
0001212545wal:ATMOfferingMember2022-01-012022-09-30
0001212545wal:ATMOfferingMember2023-09-30
00012125452022-04-012022-06-30
00012125452022-01-012022-03-31
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2023-06-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2023-06-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2023-06-30
0001212545wal:AOCIImpairmentLossMember2023-06-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2023-07-012023-09-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2023-07-012023-09-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2023-07-012023-09-30
0001212545wal:AOCIImpairmentLossMember2023-07-012023-09-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2023-09-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2023-09-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2023-09-30
0001212545wal:AOCIImpairmentLossMember2023-09-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-06-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-06-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2022-06-30
0001212545wal:AOCIImpairmentLossMember2022-06-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-07-012022-09-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-07-012022-09-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2022-07-012022-09-30
0001212545wal:AOCIImpairmentLossMember2022-07-012022-09-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-09-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-09-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2022-09-30
0001212545wal:AOCIImpairmentLossMember2022-09-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-12-31
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-12-31
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2022-12-31
0001212545wal:AOCIImpairmentLossMember2022-12-31
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2023-01-012023-09-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2023-01-012023-09-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2023-01-012023-09-30
0001212545wal:AOCIImpairmentLossMember2023-01-012023-09-30
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-12-31
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2021-12-31
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2021-12-31
0001212545wal:AOCIImpairmentLossMember2021-12-31
0001212545us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-01-012022-09-30
0001212545us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember2022-01-012022-09-30
0001212545us-gaap:AccumulatedGainLossFinancialLiabilityFairValueOptionAttributableToParentMember2022-01-012022-09-30
0001212545wal:AOCIImpairmentLossMember2022-01-012022-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2023-09-30
0001212545wal:PrepayableFixedRateLoansMember2023-09-30
0001212545us-gaap:InterestIncomeMember2023-07-012023-09-30
0001212545us-gaap:InterestIncomeMember2022-07-012022-09-30
0001212545us-gaap:InterestIncomeMember2023-01-012023-09-30
0001212545us-gaap:InterestIncomeMember2022-01-012022-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2023-07-012023-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2023-01-012023-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2022-07-012022-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2022-01-012022-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2023-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2022-12-31
0001212545us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2022-09-30
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2022-12-31
0001212545us-gaap:DesignatedAsHedgingInstrumentMember2022-09-30
0001212545us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2023-09-30
0001212545us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2022-12-31
0001212545us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2022-09-30
0001212545wal:ForwardPurchaseContractsMemberus-gaap:NondesignatedMember2023-09-30
0001212545wal:ForwardPurchaseContractsMemberus-gaap:NondesignatedMember2022-12-31
0001212545wal:ForwardPurchaseContractsMemberus-gaap:NondesignatedMember2022-09-30
0001212545wal:ForwardSalesContractsMemberus-gaap:NondesignatedMember2023-09-30
0001212545wal:ForwardSalesContractsMemberus-gaap:NondesignatedMember2022-12-31
0001212545wal:ForwardSalesContractsMemberus-gaap:NondesignatedMember2022-09-30
0001212545us-gaap:NondesignatedMemberwal:FuturesPurchaseContractsMember2023-09-30
0001212545us-gaap:NondesignatedMemberwal:FuturesPurchaseContractsMember2022-12-31
0001212545us-gaap:NondesignatedMemberwal:FuturesPurchaseContractsMember2022-09-30
0001212545us-gaap:NondesignatedMemberwal:FuturesSalesContractsMember2023-09-30
0001212545us-gaap:NondesignatedMemberwal:FuturesSalesContractsMember2022-12-31
0001212545us-gaap:NondesignatedMemberwal:FuturesSalesContractsMember2022-09-30
0001212545us-gaap:NondesignatedMemberus-gaap:InterestRateLockCommitmentsMember2023-09-30
0001212545us-gaap:NondesignatedMemberus-gaap:InterestRateLockCommitmentsMember2022-12-31
0001212545us-gaap:NondesignatedMemberus-gaap:InterestRateLockCommitmentsMember2022-09-30
0001212545us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2023-09-30
0001212545us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2022-12-31
0001212545us-gaap:NondesignatedMemberus-gaap:InterestRateSwapMember2022-09-30
0001212545us-gaap:NondesignatedMemberwal:RiskParticipationAgreementsMember2023-09-30
0001212545us-gaap:NondesignatedMemberwal:RiskParticipationAgreementsMember2022-12-31
0001212545us-gaap:NondesignatedMemberwal:RiskParticipationAgreementsMember2022-09-30
0001212545us-gaap:NondesignatedMember2023-09-30
0001212545us-gaap:NondesignatedMember2022-12-31
0001212545us-gaap:NondesignatedMember2022-09-30
0001212545wal:ForwardPurchaseContractsMember2023-09-30
0001212545wal:ForwardPurchaseContractsMember2022-12-31
0001212545wal:ForwardPurchaseContractsMember2022-09-30
0001212545wal:ForwardSalesContractsMember2023-09-30
0001212545wal:ForwardSalesContractsMember2022-12-31
0001212545wal:ForwardSalesContractsMember2022-09-30
0001212545us-gaap:InterestRateSwapMember2023-09-30
0001212545us-gaap:InterestRateSwapMember2022-12-31
0001212545us-gaap:InterestRateSwapMember2022-09-30
0001212545us-gaap:ForeignExchangeContractMember2023-09-30
0001212545us-gaap:ForeignExchangeContractMember2022-12-31
0001212545us-gaap:ForeignExchangeContractMember2022-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2023-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2022-12-31
0001212545us-gaap:InterestRateLockCommitmentsMember2022-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2023-07-012023-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2022-07-012022-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2023-01-012023-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2022-01-012022-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:ForwardContractsMember2023-07-012023-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:ForwardContractsMember2022-07-012022-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:ForwardContractsMember2023-01-012023-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:ForwardContractsMember2022-01-012022-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:InterestRateSwapMember2023-07-012023-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:InterestRateSwapMember2022-07-012022-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:InterestRateSwapMember2023-01-012023-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMemberus-gaap:InterestRateSwapMember2022-01-012022-09-30
0001212545us-gaap:OtherContractMember2023-07-012023-09-30
0001212545us-gaap:OtherContractMember2022-07-012022-09-30
0001212545us-gaap:OtherContractMember2023-01-012023-09-30
0001212545us-gaap:OtherContractMember2022-01-012022-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMember2023-07-012023-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMember2022-07-012022-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMember2023-01-012023-09-30
0001212545wal:NetGainOnLoanOriginationAndSaleActivitiesMember2022-01-012022-09-30
0001212545us-gaap:ForwardContractsMemberwal:LoanServicingFeesNetMember2023-07-012023-09-30
0001212545us-gaap:ForwardContractsMemberwal:LoanServicingFeesNetMember2022-07-012022-09-30
0001212545us-gaap:ForwardContractsMemberwal:LoanServicingFeesNetMember2023-01-012023-09-30
0001212545us-gaap:ForwardContractsMemberwal:LoanServicingFeesNetMember2022-01-012022-09-30
0001212545us-gaap:FutureMember2023-07-012023-09-30
0001212545us-gaap:FutureMember2022-07-012022-09-30
0001212545us-gaap:FutureMember2023-01-012023-09-30
0001212545us-gaap:FutureMember2022-01-012022-09-30
0001212545us-gaap:InterestRateSwapMemberwal:LoanServicingFeesNetMember2023-07-012023-09-30
0001212545us-gaap:InterestRateSwapMemberwal:LoanServicingFeesNetMember2022-07-012022-09-30
0001212545us-gaap:InterestRateSwapMemberwal:LoanServicingFeesNetMember2023-01-012023-09-30
0001212545us-gaap:InterestRateSwapMemberwal:LoanServicingFeesNetMember2022-01-012022-09-30
0001212545wal:LoanServicingFeesNetMember2023-07-012023-09-30
0001212545wal:LoanServicingFeesNetMember2022-07-012022-09-30
0001212545wal:LoanServicingFeesNetMember2023-01-012023-09-30
0001212545wal:LoanServicingFeesNetMember2022-01-012022-09-30
0001212545us-gaap:RestrictedStockMember2023-07-012023-09-30
0001212545us-gaap:RestrictedStockMember2022-07-012022-09-30
0001212545us-gaap:RestrictedStockMember2023-01-012023-09-30
0001212545us-gaap:RestrictedStockMember2022-01-012022-09-30
0001212545us-gaap:CommitmentsToExtendCreditMember2023-09-30
0001212545us-gaap:CommitmentsToExtendCreditMember2022-12-31
0001212545wal:CreditCardCommitmentsAndFinancialGuaranteesMember2023-09-30
0001212545wal:CreditCardCommitmentsAndFinancialGuaranteesMember2022-12-31
0001212545us-gaap:StandbyLettersOfCreditMember2023-09-30
0001212545us-gaap:StandbyLettersOfCreditMember2022-12-31
0001212545us-gaap:UnfundedLoanCommitmentMember2023-09-30
0001212545us-gaap:UnfundedLoanCommitmentMember2022-12-31
0001212545us-gaap:LoansReceivableMemberwal:CommercialAndIndustrialMemberus-gaap:CreditConcentrationRiskMember2023-01-012023-09-30
0001212545us-gaap:LoansReceivableMemberwal:CommercialAndIndustrialMemberus-gaap:CreditConcentrationRiskMember2022-01-012022-12-31
0001212545us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:LoansReceivableMemberus-gaap:CreditConcentrationRiskMember2023-01-012023-09-30
0001212545us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:LoansReceivableMemberus-gaap:CreditConcentrationRiskMember2022-01-012022-12-31
0001212545us-gaap:LoansReceivableMemberwal:ConstructionAndLandDevelopmentLandMemberus-gaap:CreditConcentrationRiskMember2023-01-012023-09-30
0001212545us-gaap:LoansReceivableMemberwal:ConstructionAndLandDevelopmentLandMemberus-gaap:CreditConcentrationRiskMember2022-01-012022-12-31
0001212545us-gaap:JuniorSubordinatedDebtMember2023-07-012023-09-30
0001212545us-gaap:JuniorSubordinatedDebtMember2022-07-012022-09-30
0001212545us-gaap:JuniorSubordinatedDebtMember2023-01-012023-09-30
0001212545us-gaap:JuniorSubordinatedDebtMember2022-01-012022-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NontaxableMunicipalBondsMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NontaxableMunicipalBondsMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NontaxableMunicipalBondsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasurySecuritiesMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAggregatedInvestmentsMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAggregatedInvestmentsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PreferredStockMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PreferredStockMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CollateralizedLoanObligationsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CommercialMortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterpriseMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NontaxableMunicipalBondsMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NontaxableMunicipalBondsMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NontaxableMunicipalBondsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAggregatedInvestmentsMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherAggregatedInvestmentsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberwal:CraInvestmentsMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PreferredStockMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PreferredStockMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:PreferredStockMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:JuniorSubordinatedDebtMember2023-06-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:JuniorSubordinatedDebtMember2022-06-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:JuniorSubordinatedDebtMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:JuniorSubordinatedDebtMember2021-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:JuniorSubordinatedDebtMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:JuniorSubordinatedDebtMember2022-09-30
0001212545us-gaap:JuniorSubordinatedDebtMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:JuniorSubordinatedDebtMember2023-09-30
0001212545us-gaap:JuniorSubordinatedDebtMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:JuniorSubordinatedDebtMember2022-12-31
0001212545us-gaap:ServicingContractsMember2023-06-30
0001212545us-gaap:InterestRateLockCommitmentsMember2023-06-30
0001212545us-gaap:ServicingContractsMember2022-12-31
0001212545us-gaap:InterestRateLockCommitmentsMember2022-12-31
0001212545us-gaap:InterestRateLockCommitmentsMember2023-07-012023-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2023-01-012023-09-30
0001212545us-gaap:ServicingContractsMember2023-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2023-09-30
0001212545us-gaap:ServicingContractsMember2022-06-30
0001212545us-gaap:InterestRateLockCommitmentsMember2022-06-30
0001212545us-gaap:ServicingContractsMember2021-12-31
0001212545us-gaap:InterestRateLockCommitmentsMember2021-12-31
0001212545us-gaap:InterestRateLockCommitmentsMember2022-07-012022-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2022-01-012022-09-30
0001212545us-gaap:ServicingContractsMember2022-09-30
0001212545us-gaap:InterestRateLockCommitmentsMember2022-09-30
0001212545srt:MinimumMemberwal:OptionAdjustedSpreadMember2023-09-30
0001212545srt:MaximumMemberwal:OptionAdjustedSpreadMember2023-09-30
0001212545wal:OptionAdjustedSpreadMembersrt:WeightedAverageMember2023-09-30
0001212545wal:ConditionalPrepaymentRateMembersrt:MinimumMember2023-09-30
0001212545wal:ConditionalPrepaymentRateMembersrt:MaximumMember2023-09-30
0001212545wal:ConditionalPrepaymentRateMembersrt:WeightedAverageMember2023-09-30
0001212545srt:MinimumMemberwal:RecaptureRateMember2023-09-30
0001212545srt:MaximumMemberwal:RecaptureRateMember2023-09-30
0001212545wal:RecaptureRateMembersrt:WeightedAverageMember2023-09-30
0001212545srt:MinimumMemberwal:ServicingFeeRateMember2023-09-30
0001212545wal:ServicingFeeRateMembersrt:MaximumMember2023-09-30
0001212545wal:ServicingFeeRateMembersrt:WeightedAverageMember2023-09-30
0001212545srt:MinimumMemberwal:CostToServiceMember2023-09-30
0001212545wal:CostToServiceMembersrt:MaximumMember2023-09-30
0001212545wal:CostToServiceMembersrt:WeightedAverageMember2023-09-30
0001212545srt:MinimumMemberwal:ServicingFeeMultipleMember2023-09-30
0001212545srt:MaximumMemberwal:ServicingFeeMultipleMember2023-09-30
0001212545wal:ServicingFeeMultipleMembersrt:WeightedAverageMember2023-09-30
0001212545srt:MinimumMemberwal:PullThroughRateMember2023-09-30
0001212545srt:MaximumMemberwal:PullThroughRateMember2023-09-30
0001212545wal:PullThroughRateMembersrt:WeightedAverageMember2023-09-30
0001212545srt:MinimumMemberwal:OptionAdjustedSpreadMember2022-12-31
0001212545srt:MaximumMemberwal:OptionAdjustedSpreadMember2022-12-31
0001212545wal:OptionAdjustedSpreadMembersrt:WeightedAverageMember2022-12-31
0001212545wal:ConditionalPrepaymentRateMembersrt:MinimumMember2022-12-31
0001212545wal:ConditionalPrepaymentRateMembersrt:MaximumMember2022-12-31
0001212545wal:ConditionalPrepaymentRateMembersrt:WeightedAverageMember2022-12-31
0001212545srt:MinimumMemberwal:RecaptureRateMember2022-12-31
0001212545srt:MaximumMemberwal:RecaptureRateMember2022-12-31
0001212545wal:RecaptureRateMembersrt:WeightedAverageMember2022-12-31
0001212545srt:MinimumMemberwal:ServicingFeeRateMember2022-12-31
0001212545wal:ServicingFeeRateMembersrt:MaximumMember2022-12-31
0001212545wal:ServicingFeeRateMembersrt:WeightedAverageMember2022-12-31
0001212545srt:MinimumMemberwal:CostToServiceMember2022-12-31
0001212545wal:CostToServiceMembersrt:MaximumMember2022-12-31
0001212545wal:CostToServiceMembersrt:WeightedAverageMember2022-12-31
0001212545srt:MinimumMemberwal:ServicingFeeMultipleMember2022-12-31
0001212545srt:MaximumMemberwal:ServicingFeeMultipleMember2022-12-31
0001212545wal:ServicingFeeMultipleMembersrt:WeightedAverageMember2022-12-31
0001212545srt:MinimumMemberwal:PullThroughRateMember2022-12-31
0001212545srt:MaximumMemberwal:PullThroughRateMember2022-12-31
0001212545wal:PullThroughRateMembersrt:WeightedAverageMember2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMember2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMember2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545wal:ValuationTechniqueCollateralMethodMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberwal:ThirdPartyAppraisalMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545wal:ValuationTechniqueCollateralMethodMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberwal:ThirdPartyAppraisalMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberwal:DiscountRateMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberwal:DiscountRateMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545wal:ScheduledCashCollectionsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545wal:ScheduledCashCollectionsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberus-gaap:FairValueInputsLevel3Memberwal:ProceedsfromNonRealEstateCollateralMember2023-09-30
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberwal:ProceedsfromNonRealEstateCollateralMember2023-09-30
0001212545wal:ValuationTechniqueCollateralMethodMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberwal:ThirdPartyAppraisalMemberus-gaap:OtherAssetsMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545wal:ValuationTechniqueCollateralMethodMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MaximumMemberwal:ThirdPartyAppraisalMemberus-gaap:OtherAssetsMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545wal:ValuationTechniqueCollateralMethodMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberwal:ThirdPartyAppraisalMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545wal:ValuationTechniqueCollateralMethodMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberwal:ThirdPartyAppraisalMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberwal:DiscountRateMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberwal:DiscountRateMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545wal:ScheduledCashCollectionsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545wal:ScheduledCashCollectionsMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMemberus-gaap:FairValueInputsLevel3Memberwal:ProceedsfromNonRealEstateCollateralMember2022-12-31
0001212545us-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LoansAndFinanceReceivablesMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberwal:ProceedsfromNonRealEstateCollateralMember2022-12-31
0001212545wal:ValuationTechniqueCollateralMethodMembersrt:MinimumMemberus-gaap:FairValueMeasurementsNonrecurringMemberwal:ThirdPartyAppraisalMemberus-gaap:OtherAssetsMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545wal:ValuationTechniqueCollateralMethodMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MaximumMemberwal:ThirdPartyAppraisalMemberus-gaap:OtherAssetsMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:FairValueMeasurementsNonrecurringMember2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2023-09-30
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-09-30
0001212545us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:FairValueMeasurementsNonrecurringMember2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2022-12-31
0001212545us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2022-12-31wal:Reportable_Business_Segments
0001212545srt:MinimumMember2023-01-012023-09-30
0001212545srt:MaximumMember2023-01-012023-09-30
0001212545wal:CommercialSegmentMemberus-gaap:OperatingSegmentsMember2023-09-30
0001212545wal:ConsumerRelatedSegmentMemberus-gaap:OperatingSegmentsMember2023-09-30
0001212545us-gaap:CorporateNonSegmentMemberwal:CorporateAndOtherSegmentMember2023-09-30
0001212545wal:CommercialSegmentMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-30
0001212545wal:ConsumerRelatedSegmentMemberus-gaap:OperatingSegmentsMember2023-07-012023-09-30
0001212545us-gaap:CorporateNonSegmentMemberwal:CorporateAndOtherSegmentMember2023-07-012023-09-30
0001212545wal:CommercialSegmentMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-30
0001212545wal:ConsumerRelatedSegmentMemberus-gaap:OperatingSegmentsMember2023-01-012023-09-30
0001212545us-gaap:CorporateNonSegmentMemberwal:CorporateAndOtherSegmentMember2023-01-012023-09-30
0001212545wal:CommercialSegmentMemberus-gaap:OperatingSegmentsMember2022-12-31
0001212545wal:ConsumerRelatedSegmentMemberus-gaap:OperatingSegmentsMember2022-12-31
0001212545us-gaap:CorporateNonSegmentMemberwal:CorporateAndOtherSegmentMember2022-12-31
0001212545wal:CommercialSegmentMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-30
0001212545wal:ConsumerRelatedSegmentMemberus-gaap:OperatingSegmentsMember2022-07-012022-09-30
0001212545us-gaap:CorporateNonSegmentMemberwal:CorporateAndOtherSegmentMember2022-07-012022-09-30
0001212545wal:CommercialSegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-30
0001212545wal:ConsumerRelatedSegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-09-30
0001212545us-gaap:CorporateNonSegmentMemberwal:CorporateAndOtherSegmentMember2022-01-012022-09-30
0001212545wal:DigitalDisbursementsMember2022-01-252022-01-25
0001212545wal:DigitalDisbursementsMember2022-01-25
0001212545wal:DigitalDisbursementsMember2022-01-012022-09-30
0001212545wal:DigitalDisbursementsMemberus-gaap:CustomerRelationshipsMember2022-01-25
0001212545us-gaap:DevelopedTechnologyRightsMemberwal:DigitalDisbursementsMember2022-01-25
0001212545us-gaap:TradeNamesMemberwal:DigitalDisbursementsMember2022-01-25