mtb-10q_20210930.htm
false 2021 Q3 0000036270 --12-31 2027-01-01 2033-12-31 http://fasb.org/us-gaap/2021-01-31#MeasurementInputComparabilityAdjustmentMember 2021 350000 50000 40000 50000 350000 50000 40000 P2Y7M6D P8M12D P9M18D P3Y3M18D P10M24D P1Y 0.00 0.93 0.14 0.00 0.98 0.16 0000036270 2021-01-01 2021-09-30 xbrli:shares 0000036270 2021-10-29 iso4217:USD 0000036270 2021-09-30 0000036270 2020-12-31 iso4217:USD xbrli:shares 0000036270 mtb:SeriesASeriesCAndSeriesEPreferredStockMember 2021-09-30 0000036270 mtb:SeriesASeriesCAndSeriesEPreferredStockMember 2020-12-31 0000036270 mtb:SeriesFAndSeriesGPreferredStockMember 2021-09-30 0000036270 mtb:SeriesFAndSeriesGPreferredStockMember 2020-12-31 0000036270 2021-07-01 2021-09-30 0000036270 2020-07-01 2020-09-30 0000036270 2020-01-01 2020-09-30 0000036270 us-gaap:MortgageBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:MortgageBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:MortgageBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:MortgageBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:DepositAccountMember 2021-07-01 2021-09-30 0000036270 us-gaap:DepositAccountMember 2020-07-01 2020-09-30 0000036270 us-gaap:DepositAccountMember 2021-01-01 2021-09-30 0000036270 us-gaap:DepositAccountMember 2020-01-01 2020-09-30 0000036270 us-gaap:FiduciaryAndTrustMember 2021-07-01 2021-09-30 0000036270 us-gaap:FiduciaryAndTrustMember 2020-07-01 2020-09-30 0000036270 us-gaap:FiduciaryAndTrustMember 2021-01-01 2021-09-30 0000036270 us-gaap:FiduciaryAndTrustMember 2020-01-01 2020-09-30 0000036270 2019-12-31 0000036270 2020-09-30 0000036270 us-gaap:PreferredStockMember 2021-06-30 0000036270 us-gaap:CommonStockMember 2021-06-30 0000036270 mtb:CommonStockIssuableMember 2021-06-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2021-06-30 0000036270 us-gaap:RetainedEarningsMember 2021-06-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2021-06-30 0000036270 us-gaap:TreasuryStockMember 2021-06-30 0000036270 2021-06-30 0000036270 us-gaap:RetainedEarningsMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2021-07-01 2021-09-30 0000036270 us-gaap:PreferredStockMember mtb:SeriesIPreferredStockMember 2021-07-01 2021-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember mtb:SeriesIPreferredStockMember 2021-07-01 2021-09-30 0000036270 mtb:SeriesIPreferredStockMember 2021-07-01 2021-09-30 0000036270 mtb:CommonStockIssuableMember 2021-07-01 2021-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2021-07-01 2021-09-30 0000036270 us-gaap:TreasuryStockMember 2021-07-01 2021-09-30 0000036270 us-gaap:PreferredStockMember 2021-09-30 0000036270 us-gaap:CommonStockMember 2021-09-30 0000036270 mtb:CommonStockIssuableMember 2021-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2021-09-30 0000036270 us-gaap:RetainedEarningsMember 2021-09-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2021-09-30 0000036270 us-gaap:TreasuryStockMember 2021-09-30 0000036270 us-gaap:PreferredStockMember 2020-12-31 0000036270 us-gaap:CommonStockMember 2020-12-31 0000036270 mtb:CommonStockIssuableMember 2020-12-31 0000036270 us-gaap:AdditionalPaidInCapitalMember 2020-12-31 0000036270 us-gaap:RetainedEarningsMember 2020-12-31 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-12-31 0000036270 us-gaap:TreasuryStockMember 2020-12-31 0000036270 us-gaap:RetainedEarningsMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2021-01-01 2021-09-30 0000036270 us-gaap:PreferredStockMember mtb:SeriesIPreferredStockMember 2021-01-01 2021-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember mtb:SeriesIPreferredStockMember 2021-01-01 2021-09-30 0000036270 mtb:SeriesIPreferredStockMember 2021-01-01 2021-09-30 0000036270 mtb:CommonStockIssuableMember 2021-01-01 2021-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2021-01-01 2021-09-30 0000036270 us-gaap:TreasuryStockMember 2021-01-01 2021-09-30 0000036270 us-gaap:PreferredStockMember 2020-06-30 0000036270 us-gaap:CommonStockMember 2020-06-30 0000036270 mtb:CommonStockIssuableMember 2020-06-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2020-06-30 0000036270 us-gaap:RetainedEarningsMember 2020-06-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-06-30 0000036270 us-gaap:TreasuryStockMember 2020-06-30 0000036270 2020-06-30 0000036270 us-gaap:RetainedEarningsMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-07-01 2020-09-30 0000036270 mtb:CommonStockIssuableMember 2020-07-01 2020-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2020-07-01 2020-09-30 0000036270 us-gaap:TreasuryStockMember 2020-07-01 2020-09-30 0000036270 us-gaap:PreferredStockMember 2020-09-30 0000036270 us-gaap:CommonStockMember 2020-09-30 0000036270 mtb:CommonStockIssuableMember 2020-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2020-09-30 0000036270 us-gaap:RetainedEarningsMember 2020-09-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-09-30 0000036270 us-gaap:TreasuryStockMember 2020-09-30 0000036270 us-gaap:PreferredStockMember 2019-12-31 0000036270 us-gaap:CommonStockMember 2019-12-31 0000036270 mtb:CommonStockIssuableMember 2019-12-31 0000036270 us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000036270 us-gaap:RetainedEarningsMember 2019-12-31 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000036270 us-gaap:TreasuryStockMember 2019-12-31 0000036270 us-gaap:RetainedEarningsMember us-gaap:AccountingStandardsUpdate201613Member 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201613Member 2020-01-01 2020-09-30 0000036270 us-gaap:RetainedEarningsMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-09-30 0000036270 us-gaap:TreasuryStockMember 2020-01-01 2020-09-30 0000036270 mtb:CommonStockIssuableMember 2020-01-01 2020-09-30 0000036270 us-gaap:AdditionalPaidInCapitalMember 2020-01-01 2020-09-30 0000036270 us-gaap:SeriesEPreferredStockMember 2021-07-01 2021-09-30 0000036270 us-gaap:SeriesEPreferredStockMember 2021-01-01 2021-09-30 0000036270 us-gaap:SeriesEPreferredStockMember 2020-07-01 2020-09-30 0000036270 us-gaap:SeriesEPreferredStockMember 2020-01-01 2020-09-30 0000036270 us-gaap:SeriesFPreferredStockMember 2021-07-01 2021-09-30 0000036270 us-gaap:SeriesFPreferredStockMember 2021-01-01 2021-09-30 0000036270 us-gaap:SeriesFPreferredStockMember 2020-07-01 2020-09-30 0000036270 us-gaap:SeriesFPreferredStockMember 2020-01-01 2020-09-30 0000036270 us-gaap:SeriesGPreferredStockMember 2021-07-01 2021-09-30 0000036270 us-gaap:SeriesGPreferredStockMember 2021-01-01 2021-09-30 0000036270 us-gaap:SeriesGPreferredStockMember 2020-07-01 2020-09-30 0000036270 us-gaap:SeriesGPreferredStockMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member 2021-01-01 2021-09-30 0000036270 mtb:PeoplesUnitedFinancialIncMember 2021-02-22 2021-02-22 0000036270 mtb:MTMember 2021-02-22 0000036270 mtb:PeoplesUnitedFinancialIncMember 2021-09-30 0000036270 mtb:PeoplesUnitedFinancialIncMember 2021-01-01 2021-09-30 0000036270 mtb:PeoplesUnitedFinancialIncMember us-gaap:FinancialServiceMember 2021-07-01 2021-09-30 0000036270 mtb:PeoplesUnitedFinancialIncMember us-gaap:FinancialServiceMember 2021-01-01 2021-09-30 0000036270 us-gaap:USTreasuryAndGovernmentMember 2021-09-30 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2021-09-30 0000036270 us-gaap:OtherDebtSecuritiesMember 2021-09-30 0000036270 us-gaap:USStatesAndPoliticalSubdivisionsMember 2021-09-30 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2021-09-30 0000036270 us-gaap:USTreasuryAndGovernmentMember 2020-12-31 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2020-12-31 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2020-12-31 0000036270 us-gaap:OtherDebtSecuritiesMember 2020-12-31 0000036270 us-gaap:USStatesAndPoliticalSubdivisionsMember 2020-12-31 0000036270 srt:MaximumMember 2021-07-01 2021-09-30 mtb:Security 0000036270 us-gaap:AvailableforsaleSecuritiesMember 2021-09-30 0000036270 us-gaap:AvailableforsaleSecuritiesMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:RecreationalFinanceMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 us-gaap:AutomobileLoanMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:OtherLoansMember us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 us-gaap:FinancialAssetNotPastDueMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember 2021-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2021-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2021-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2021-09-30 0000036270 mtb:RecreationalFinanceMember 2021-09-30 0000036270 us-gaap:AutomobileLoanMember 2021-09-30 0000036270 mtb:OtherLoansMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:ResidentialBuilderAndDeveloperMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:OtherCommercialConstructionMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:ResidentialLimitedDocumentationMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:RecreationalFinanceMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 us-gaap:AutomobileLoanMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:OtherLoansMember us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 us-gaap:FinancialAssetNotPastDueMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-12-31 0000036270 mtb:OtherCommercialConstructionMember 2020-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2020-12-31 0000036270 mtb:ResidentialLimitedDocumentationMember 2020-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember 2020-12-31 0000036270 mtb:RecreationalFinanceMember 2020-12-31 0000036270 us-gaap:AutomobileLoanMember 2020-12-31 0000036270 mtb:OtherLoansMember 2020-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:RecreationalFinanceMember us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 us-gaap:AutomobileLoanMember us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:OtherLoansMember us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember mtb:OtherForbearancesMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:OtherForbearancesMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember mtb:OtherForbearancesMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:OtherForbearancesMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:RecreationalFinanceMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 us-gaap:AutomobileLoanMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:OtherLoansMember mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:COVID19Member 2021-01-01 2021-09-30 0000036270 mtb:COVID19Member us-gaap:PaymentDeferralMember mtb:GovernmentGuaranteedLoansMember 2021-01-01 2021-09-30 0000036270 us-gaap:ResidentialMortgageMember us-gaap:ResidentialPortfolioSegmentMember 2021-09-30 0000036270 us-gaap:ResidentialMortgageMember us-gaap:ResidentialPortfolioSegmentMember 2020-12-31 0000036270 us-gaap:RealEstateLoanMember us-gaap:ResidentialPortfolioSegmentMember 2021-09-30 0000036270 us-gaap:RealEstateLoanMember us-gaap:ResidentialPortfolioSegmentMember 2020-12-31 0000036270 srt:MinimumMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialLoansAndCommercialRealEstateMember srt:MinimumMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedNonaccrualMember 2019-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialBuilderAndDeveloperMember 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember us-gaap:PassMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherCommercialConstructionMember 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialRealEstateExcludingAltAMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialRealEstateExcludingAltAMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialRealEstateExcludingAltAMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialRealEstateExcludingAltAMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialRealEstateExcludingAltAMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialRealEstateExcludingAltAMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialRealEstateExcludingAltAMember 2021-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialLimitedDocumentationMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:HomeEquityLinesAndLoansMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:HomeEquityLinesAndLoansMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:HomeEquityLinesAndLoansMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:HomeEquityLinesAndLoansMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:HomeEquityLinesAndLoansMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:HomeEquityLinesAndLoansMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:HomeEquityLinesAndLoansMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:HomeEquityLinesAndLoansMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:RecreationalFinanceMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember us-gaap:AutomobileLoanMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherLoansMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherLoansMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:OtherLoansMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember 2020-09-30 0000036270 us-gaap:LongTermDebtMember 2019-09-30 0000036270 us-gaap:LongTermDebtMember 2018-09-30 0000036270 us-gaap:LongTermDebtMember 2017-09-30 0000036270 mtb:LongTermDebtPriorPeriodMember 2021-09-30 0000036270 us-gaap:RevolvingCreditFacilityMember 2021-09-30 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2020-12-31 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialFinancialLeasingMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2020-12-31 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2020-12-31 0000036270 mtb:ResidentialBuilderAndDeveloperMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2017-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedNonaccrualMember 2019-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 mtb:ResidentialBuilderAndDeveloperMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:ResidentialBuilderAndDeveloperMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:ResidentialBuilderAndDeveloperMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:ResidentialBuilderAndDeveloperMember 2020-12-31 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherCommercialConstructionMember us-gaap:PassMember 2020-12-31 0000036270 mtb:OtherCommercialConstructionMember us-gaap:PassMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 mtb:OtherCommercialConstructionMember mtb:CriticizedAccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 mtb:OtherCommercialConstructionMember mtb:CriticizedNonaccrualMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherCommercialConstructionMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherCommercialConstructionMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherCommercialConstructionMember 2020-12-31 0000036270 mtb:OtherCommercialConstructionMember 2020-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:LongTermDebtMember 2020-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:LongTermDebtMember 2019-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:LongTermDebtMember 2018-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:LongTermDebtMember 2017-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:LongTermDebtMember 2016-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember mtb:LongTermDebtPriorPeriodMember 2020-12-31 0000036270 mtb:ResidentialRealEstateExcludingAltAMember us-gaap:RevolvingCreditFacilityMember 2020-12-31 0000036270 mtb:ResidentialLimitedDocumentationMember mtb:LongTermDebtPriorPeriodMember 2020-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:LongTermDebtMember 2020-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:LongTermDebtMember 2019-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:LongTermDebtMember 2018-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:LongTermDebtMember 2017-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:LongTermDebtMember 2016-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember mtb:LongTermDebtPriorPeriodMember 2020-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember us-gaap:RevolvingCreditFacilityMember 2020-12-31 0000036270 mtb:HomeEquityLinesAndLoansMember mtb:RevolvingLoansConvertedToTermLoansMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:RecreationalFinanceMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:RecreationalFinanceMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember us-gaap:AutomobileLoanMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember us-gaap:AutomobileLoanMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember mtb:OtherLoansMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember mtb:OtherLoansMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember mtb:OtherLoansMember 2020-12-31 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember mtb:OtherLoansMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember 2019-12-31 0000036270 us-gaap:LongTermDebtMember 2018-12-31 0000036270 us-gaap:LongTermDebtMember 2017-12-31 0000036270 us-gaap:LongTermDebtMember 2016-12-31 0000036270 mtb:LongTermDebtPriorPeriodMember 2020-12-31 0000036270 us-gaap:RevolvingCreditFacilityMember 2020-12-31 0000036270 mtb:RevolvingLoansConvertedToTermLoansMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember 2021-06-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-06-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2021-06-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2021-06-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-07-01 2021-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-09-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2021-09-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-06-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-06-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2020-06-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2020-06-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-07-01 2020-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-09-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2020-09-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2020-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-12-31 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-12-31 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2020-12-31 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2020-12-31 0000036270 mtb:CommercialFinancialLeasingMember 2021-01-01 2021-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2019-12-31 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2019-12-31 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2019-12-31 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2019-12-31 0000036270 us-gaap:UnallocatedFinancingReceivablesMember 2019-12-31 0000036270 mtb:CommercialFinancialLeasingMember 2020-01-01 2020-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:ResidentialPortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:ConsumerPortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:UnallocatedFinancingReceivablesMember 2020-01-01 2020-09-30 0000036270 srt:MaximumMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-06-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-06-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2021-06-30 0000036270 mtb:OtherCommercialConstructionMember 2021-06-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2021-06-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2021-06-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2021-06-30 0000036270 mtb:RecreationalFinanceMember 2021-06-30 0000036270 us-gaap:AutomobileLoanMember 2021-06-30 0000036270 mtb:OtherLoansMember 2021-06-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-01-01 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-01-01 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2021-01-01 0000036270 mtb:OtherCommercialConstructionMember 2021-01-01 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2021-01-01 0000036270 mtb:ResidentialLimitedDocumentationMember 2021-01-01 0000036270 mtb:HomeEquityLinesAndLoansMember 2021-01-01 0000036270 mtb:RecreationalFinanceMember 2021-01-01 0000036270 us-gaap:AutomobileLoanMember 2021-01-01 0000036270 mtb:OtherLoansMember 2021-01-01 0000036270 2021-01-01 0000036270 mtb:CommercialFinancialLeasingMember 2021-07-01 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-07-01 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2021-07-01 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember 2021-07-01 2021-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2021-07-01 2021-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2021-07-01 2021-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2021-07-01 2021-09-30 0000036270 mtb:RecreationalFinanceMember 2021-07-01 2021-09-30 0000036270 us-gaap:AutomobileLoanMember 2021-07-01 2021-09-30 0000036270 mtb:OtherLoansMember 2021-07-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-01-01 2021-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2021-01-01 2021-09-30 0000036270 mtb:OtherCommercialConstructionMember 2021-01-01 2021-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2021-01-01 2021-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2021-01-01 2021-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2021-01-01 2021-09-30 0000036270 mtb:RecreationalFinanceMember 2021-01-01 2021-09-30 0000036270 us-gaap:AutomobileLoanMember 2021-01-01 2021-09-30 0000036270 mtb:OtherLoansMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-09-30 0000036270 mtb:OtherCommercialConstructionMember 2020-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2020-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2020-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2020-09-30 0000036270 mtb:RecreationalFinanceMember 2020-09-30 0000036270 us-gaap:AutomobileLoanMember 2020-09-30 0000036270 mtb:OtherLoansMember 2020-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-06-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-06-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-06-30 0000036270 mtb:OtherCommercialConstructionMember 2020-06-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2020-06-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2020-06-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2020-06-30 0000036270 mtb:RecreationalFinanceMember 2020-06-30 0000036270 us-gaap:AutomobileLoanMember 2020-06-30 0000036270 mtb:OtherLoansMember 2020-06-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-01-01 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-01-01 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-01-01 0000036270 mtb:OtherCommercialConstructionMember 2020-01-01 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2020-01-01 0000036270 mtb:ResidentialLimitedDocumentationMember 2020-01-01 0000036270 mtb:HomeEquityLinesAndLoansMember 2020-01-01 0000036270 mtb:RecreationalFinanceMember 2020-01-01 0000036270 us-gaap:AutomobileLoanMember 2020-01-01 0000036270 mtb:OtherLoansMember 2020-01-01 0000036270 2020-01-01 0000036270 mtb:CommercialFinancialLeasingMember 2020-07-01 2020-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-07-01 2020-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-07-01 2020-09-30 0000036270 mtb:OtherCommercialConstructionMember 2020-07-01 2020-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2020-07-01 2020-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2020-07-01 2020-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2020-07-01 2020-09-30 0000036270 mtb:RecreationalFinanceMember 2020-07-01 2020-09-30 0000036270 us-gaap:AutomobileLoanMember 2020-07-01 2020-09-30 0000036270 mtb:OtherLoansMember 2020-07-01 2020-09-30 0000036270 mtb:CommercialFinancialLeasingMember 2020-01-01 2020-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-01-01 2020-09-30 0000036270 mtb:ResidentialBuilderAndDeveloperMember 2020-01-01 2020-09-30 0000036270 mtb:OtherCommercialConstructionMember 2020-01-01 2020-09-30 0000036270 mtb:ResidentialRealEstateExcludingAltAMember 2020-01-01 2020-09-30 0000036270 mtb:ResidentialLimitedDocumentationMember 2020-01-01 2020-09-30 0000036270 mtb:HomeEquityLinesAndLoansMember 2020-01-01 2020-09-30 0000036270 mtb:RecreationalFinanceMember 2020-01-01 2020-09-30 0000036270 us-gaap:AutomobileLoanMember 2020-01-01 2020-09-30 0000036270 mtb:OtherLoansMember 2020-01-01 2020-09-30 mtb:Modification 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 mtb:OtherMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:CommercialFinancialLeasingMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialRealEstateExcludingAltAMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialLimitedDocumentationMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:HomeEquityLinesAndLoansMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:RecreationalFinanceMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:AutomobileLoanMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:OtherLoansMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember 2021-07-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:CommercialFinancialLeasingMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialRealEstateExcludingAltAMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:HomeEquityLinesAndLoansMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:RecreationalFinanceMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:AutomobileLoanMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:OtherMember 2020-07-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember 2020-07-01 2020-09-30 0000036270 us-gaap:ContractualInterestRateReductionMember mtb:CommercialFinancialLeasingMember 2020-07-01 2020-09-30 0000036270 us-gaap:ContractualInterestRateReductionMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:ContractualInterestRateReductionMember 2020-07-01 2020-09-30 0000036270 mtb:OtherMember mtb:CommercialFinancialLeasingMember 2021-07-01 2021-09-30 0000036270 mtb:OtherMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 mtb:OtherMember 2021-07-01 2021-09-30 0000036270 mtb:OtherMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 mtb:OtherMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:CommercialFinancialLeasingMember 2021-07-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-07-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:ResidentialRealEstateExcludingAltAMember 2021-07-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:HomeEquityLinesAndLoansMember 2021-07-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember 2021-07-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:CommercialFinancialLeasingMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:ResidentialRealEstateExcludingAltAMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:HomeEquityLinesAndLoansMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:AutomobileLoanMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:OtherMember 2020-07-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember 2020-07-01 2020-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 mtb:OtherMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:CommercialFinancialLeasingMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:OtherCommercialConstructionMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialRealEstateExcludingAltAMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialLimitedDocumentationMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:HomeEquityLinesAndLoansMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:RecreationalFinanceMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:AutomobileLoanMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:OtherLoansMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember 2021-01-01 2021-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:CommercialFinancialLeasingMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialRealEstateExcludingAltAMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:ResidentialLimitedDocumentationMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:HomeEquityLinesAndLoansMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:RecreationalFinanceMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember us-gaap:AutomobileLoanMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember mtb:OtherMember 2020-01-01 2020-09-30 0000036270 us-gaap:PaymentDeferralMember 2020-01-01 2020-09-30 0000036270 us-gaap:ContractualInterestRateReductionMember mtb:CommercialFinancialLeasingMember 2020-01-01 2020-09-30 0000036270 us-gaap:ContractualInterestRateReductionMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:ContractualInterestRateReductionMember 2020-01-01 2020-09-30 0000036270 mtb:OtherMember mtb:CommercialFinancialLeasingMember 2021-01-01 2021-09-30 0000036270 mtb:OtherMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 mtb:OtherMember 2021-01-01 2021-09-30 0000036270 mtb:OtherMember mtb:CommercialFinancialLeasingMember 2020-01-01 2020-09-30 0000036270 mtb:OtherMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 mtb:OtherMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:CommercialFinancialLeasingMember 2021-01-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2021-01-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:ResidentialRealEstateExcludingAltAMember 2021-01-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:HomeEquityLinesAndLoansMember 2021-01-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:AutomobileLoanMember 2021-01-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember 2021-01-01 2021-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:CommercialFinancialLeasingMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:CommercialRealEstatePortfolioSegmentMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:ResidentialBuilderAndDeveloperMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:ResidentialRealEstateExcludingAltAMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:ResidentialLimitedDocumentationMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:HomeEquityLinesAndLoansMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember us-gaap:AutomobileLoanMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember mtb:OtherMember 2020-01-01 2020-09-30 0000036270 mtb:CombinationOfConcessionTypesMember 2020-01-01 2020-09-30 xbrli:pure 0000036270 mtb:MAndTMember 2021-01-25 0000036270 mtb:MAndTMember 2021-03-01 2021-03-01 0000036270 mtb:SeriesEFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2021-09-30 0000036270 mtb:SeriesFFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2021-09-30 0000036270 mtb:SeriesGFixedRateResetNonCumulativePerpetualPreferredStockMember 2021-09-30 0000036270 mtb:SeriesIFixedRateResetNonCumulativePerpetualPreferredStockMember 2021-09-30 0000036270 mtb:SeriesEFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2020-12-31 0000036270 mtb:SeriesFFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2020-12-31 0000036270 mtb:SeriesGFixedRateResetNonCumulativePerpetualPreferredStockMember 2020-12-31 0000036270 mtb:SeriesEFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2021-01-01 2021-09-30 0000036270 mtb:SeriesEFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2020-01-01 2020-12-31 0000036270 mtb:SeriesFFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2021-01-01 2021-09-30 0000036270 mtb:SeriesFFixedToFloatingRateNonCumulativePerpetualPreferredStockMember 2020-01-01 2020-12-31 0000036270 mtb:SeriesGFixedRateResetNonCumulativePerpetualPreferredStockMember 2021-01-01 2021-09-30 0000036270 mtb:SeriesGFixedRateResetNonCumulativePerpetualPreferredStockMember 2020-01-01 2020-12-31 0000036270 mtb:SeriesIFixedRateResetNonCumulativePerpetualPreferredStockMember 2021-01-01 2021-09-30 0000036270 2021-10-01 srt:MaximumMember 2021-09-30 0000036270 us-gaap:OtherLiabilitiesMember 2021-09-30 0000036270 us-gaap:OtherLiabilitiesMember 2020-12-31 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:BusinessBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialRealEstateSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:RetailBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember us-gaap:AllOtherSegmentsMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember us-gaap:AllOtherSegmentsMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:RetailBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:AllOtherSegmentsMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:BusinessBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialRealEstateSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:DiscretionaryPortfolioMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:ResidentialMortgageBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:BusinessBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialRealEstateSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:RetailBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember us-gaap:AllOtherSegmentsMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember mtb:CommercialBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember us-gaap:AllOtherSegmentsMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:AllOtherSegmentsMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:BusinessBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialRealEstateSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:RetailBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:DiscretionaryPortfolioMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:ResidentialMortgageBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:BusinessBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialRealEstateSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:RetailBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember us-gaap:AllOtherSegmentsMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember us-gaap:AllOtherSegmentsMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:AllOtherSegmentsMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:BusinessBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialRealEstateSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:RetailBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:DiscretionaryPortfolioMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:ResidentialMortgageBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:BusinessBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:CommercialRealEstateSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember mtb:RetailBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember us-gaap:AllOtherSegmentsMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:DepositAccountMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember mtb:BusinessBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember mtb:CommercialBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember us-gaap:AllOtherSegmentsMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:FiduciaryAndTrustMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member us-gaap:AllOtherSegmentsMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:BusinessBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:CommercialRealEstateSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:RetailBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:DiscretionaryPortfolioMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccountingStandardsUpdate201409Member mtb:ResidentialMortgageBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:PensionPlansDefinedBenefitMember 2021-07-01 2021-09-30 0000036270 us-gaap:PensionPlansDefinedBenefitMember 2020-07-01 2020-09-30 0000036270 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2021-07-01 2021-09-30 0000036270 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-07-01 2020-09-30 0000036270 us-gaap:PensionPlansDefinedBenefitMember 2021-01-01 2021-09-30 0000036270 us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-09-30 0000036270 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2021-01-01 2021-09-30 0000036270 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-09-30 0000036270 us-gaap:SecuritiesInvestmentMember 2020-12-31 0000036270 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-12-31 0000036270 mtb:AccumulatedOtherMember 2020-12-31 0000036270 us-gaap:SecuritiesInvestmentMember 2021-01-01 2021-09-30 0000036270 mtb:AccumulatedOtherMember 2021-01-01 2021-09-30 0000036270 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:SecuritiesInvestmentMember 2021-09-30 0000036270 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2021-09-30 0000036270 mtb:AccumulatedOtherMember 2021-09-30 0000036270 us-gaap:SecuritiesInvestmentMember 2019-12-31 0000036270 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-12-31 0000036270 mtb:AccumulatedOtherMember 2019-12-31 0000036270 us-gaap:SecuritiesInvestmentMember 2020-01-01 2020-09-30 0000036270 mtb:AccumulatedOtherMember 2020-01-01 2020-09-30 0000036270 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:SecuritiesInvestmentMember 2020-09-30 0000036270 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-09-30 0000036270 mtb:AccumulatedOtherMember 2020-09-30 0000036270 mtb:AccumulatedOtherAdjustmentMember 2020-12-31 0000036270 mtb:AccumulatedOtherAdjustmentMember 2021-01-01 2021-09-30 0000036270 mtb:AccumulatedOtherAdjustmentMember 2021-09-30 0000036270 us-gaap:InterestRateSwapMember 2021-07-01 2021-09-30 0000036270 us-gaap:InterestRateSwapMember 2021-01-01 2021-09-30 0000036270 us-gaap:InterestRateSwapMember 2020-07-01 2020-09-30 0000036270 us-gaap:InterestRateSwapMember 2020-01-01 2020-09-30 0000036270 mtb:FixedRateLongTermBorrowingsMember us-gaap:FairValueHedgingMember 2021-09-30 0000036270 mtb:InterestPaymentsOnVariableRateCommercialRealEstateLoansMember us-gaap:CashFlowHedgingMember 2021-09-30 0000036270 mtb:FixedRateLongTermBorrowingsMember us-gaap:FairValueHedgingMember 2020-12-31 0000036270 mtb:InterestPaymentsOnVariableRateCommercialRealEstateLoansMember us-gaap:CashFlowHedgingMember 2020-12-31 0000036270 mtb:FixedRateLongTermBorrowingsMember us-gaap:FairValueHedgingMember 2021-01-01 2021-09-30 0000036270 mtb:InterestPaymentsOnVariableRateCommercialRealEstateLoansMember us-gaap:CashFlowHedgingMember 2021-01-01 2021-09-30 0000036270 mtb:FixedRateLongTermBorrowingsMember us-gaap:FairValueHedgingMember 2020-01-01 2020-12-31 0000036270 mtb:InterestPaymentsOnVariableRateCommercialRealEstateLoansMember us-gaap:CashFlowHedgingMember 2020-01-01 2020-12-31 0000036270 2020-01-01 2020-12-31 0000036270 us-gaap:FairValueHedgingMember 2021-01-01 2021-09-30 0000036270 us-gaap:FairValueHedgingMember 2020-01-01 2020-12-31 0000036270 us-gaap:CashFlowHedgingMember 2021-01-01 2021-09-30 0000036270 us-gaap:CashFlowHedgingMember 2020-01-01 2020-12-31 0000036270 mtb:ForwardStartingInterestRateSwapAgreementsMember 2021-09-30 0000036270 mtb:ForwardStartingInterestRateSwapAgreementsMember 2020-12-31 0000036270 us-gaap:InterestRateContractMember 2021-09-30 0000036270 us-gaap:InterestRateContractMember 2020-12-31 0000036270 mtb:ForeignCurrencyAndOtherOptionAndFuturesContractsMember 2021-09-30 0000036270 mtb:ForeignCurrencyAndOtherOptionAndFuturesContractsMember 2020-12-31 0000036270 us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember us-gaap:InterestRateSwapMember 2021-09-30 0000036270 us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember mtb:CommitmentsToSellRealEstateLoansMember 2021-09-30 0000036270 us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember 2021-09-30 0000036270 us-gaap:NondesignatedMember mtb:MortgageRelatedCommitmentsToOriginateRealEstateLoansForSaleMember 2021-09-30 0000036270 us-gaap:NondesignatedMember mtb:CommitmentsToSellRealEstateLoansMember 2021-09-30 0000036270 us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2021-09-30 0000036270 us-gaap:NondesignatedMember mtb:ForeignExchangeAndOtherOptionAndFuturesContractsMember 2021-09-30 0000036270 us-gaap:NondesignatedMember 2021-09-30 0000036270 us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember us-gaap:InterestRateSwapMember 2020-12-31 0000036270 us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember mtb:CommitmentsToSellRealEstateLoansMember 2020-12-31 0000036270 us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember 2020-12-31 0000036270 us-gaap:NondesignatedMember mtb:MortgageRelatedCommitmentsToOriginateRealEstateLoansForSaleMember 2020-12-31 0000036270 us-gaap:NondesignatedMember mtb:CommitmentsToSellRealEstateLoansMember 2020-12-31 0000036270 us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2020-12-31 0000036270 us-gaap:NondesignatedMember mtb:ForeignExchangeAndOtherOptionAndFuturesContractsMember 2020-12-31 0000036270 us-gaap:NondesignatedMember 2020-12-31 0000036270 us-gaap:InterestRateSwapMember us-gaap:DesignatedAsHedgingInstrumentMember mtb:FixedRateLongTermBorrowingsMember us-gaap:FairValueHedgingMember 2021-07-01 2021-09-30 0000036270 us-gaap:InterestRateSwapMember us-gaap:DesignatedAsHedgingInstrumentMember mtb:FixedRateLongTermBorrowingsMember us-gaap:FairValueHedgingMember 2020-07-01 2020-09-30 0000036270 us-gaap:InterestRateContractMember 2021-07-01 2021-09-30 0000036270 us-gaap:InterestRateContractMember 2020-07-01 2020-09-30 0000036270 mtb:ForeignExchangeAndOtherOptionAndFuturesContractsMember 2021-07-01 2021-09-30 0000036270 mtb:ForeignExchangeAndOtherOptionAndFuturesContractsMember 2020-07-01 2020-09-30 0000036270 us-gaap:InterestRateSwapMember mtb:FixedRateLongTermBorrowingsMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember 2021-01-01 2021-09-30 0000036270 us-gaap:InterestRateSwapMember mtb:FixedRateLongTermBorrowingsMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:FairValueHedgingMember 2020-01-01 2020-09-30 0000036270 us-gaap:InterestRateContractMember 2021-01-01 2021-09-30 0000036270 us-gaap:InterestRateContractMember 2020-01-01 2020-09-30 0000036270 mtb:ForeignExchangeAndOtherOptionAndFuturesContractsMember 2021-01-01 2021-09-30 0000036270 mtb:ForeignExchangeAndOtherOptionAndFuturesContractsMember 2020-01-01 2020-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:CarryingReportedAmountFairValueDisclosureMember 2020-12-31 0000036270 us-gaap:LongTermDebtMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2021-09-30 0000036270 us-gaap:LongTermDebtMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:EstimateOfFairValueFairValueDisclosureMember 2020-12-31 0000036270 us-gaap:InterestIncomeMember 2021-07-01 2021-09-30 0000036270 us-gaap:InterestIncomeMember 2020-07-01 2020-09-30 0000036270 us-gaap:InterestIncomeMember 2021-01-01 2021-09-30 0000036270 us-gaap:InterestIncomeMember 2020-01-01 2020-09-30 0000036270 us-gaap:InterestRateSwapMember mtb:MaturityPeriodOneMember 2021-01-01 2021-09-30 0000036270 us-gaap:InterestRateSwapMember mtb:MaturityPeriodTwoMember 2021-01-01 2021-09-30 0000036270 us-gaap:InterestRateSwapMember mtb:MaturityPeriodThreeMember 2021-01-01 2021-09-30 0000036270 mtb:CounterpartiesMember 2021-09-30 0000036270 mtb:CounterpartiesMember 2020-12-31 0000036270 mtb:ClearinghouseCreditFacilitiesMember 2021-09-30 0000036270 mtb:ClearinghouseCreditFacilitiesMember 2020-12-31 0000036270 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2021-09-30 0000036270 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2020-12-31 0000036270 us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:USTreasuryAndGovernmentMember us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:USTreasuryAndGovernmentMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:OtherDebtSecuritiesMember us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:OtherDebtSecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:USTreasuryAndGovernmentMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member us-gaap:USTreasuryAndGovernmentMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 mtb:MortgageBackedSecuritiesIssuedByPrivateEnterprisesResidentialMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member mtb:MortgageBackedSecuritiesIssuedByPrivateEnterprisesResidentialMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:OtherDebtSecuritiesMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member us-gaap:OtherDebtSecuritiesMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2021-06-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2021-07-01 2021-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2021-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2020-06-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2020-06-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2020-07-01 2020-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2020-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2020-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2020-12-31 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2020-12-31 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2021-01-01 2021-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2021-01-01 2021-09-30 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2019-12-31 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2019-12-31 0000036270 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member mtb:OtherAssetsAndOtherLiabilitiesMember 2020-01-01 2020-09-30 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember 2021-09-30 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember 2020-12-31 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember 2020-09-30 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:FairValueInputsLevel2Member 2021-09-30 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:FairValueInputsLevel2Member 2020-12-31 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:FairValueInputsLevel2Member 2020-09-30 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:FairValueInputsLevel3Member 2021-09-30 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:FairValueInputsLevel3Member 2020-12-31 0000036270 us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:FairValueInputsLevel3Member 2020-09-30 0000036270 us-gaap:FairValueInputsLevel3Member 2021-01-01 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member 2021-07-01 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member 2020-01-01 2020-09-30 0000036270 us-gaap:FairValueInputsLevel3Member 2020-07-01 2020-09-30 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2021-01-01 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2020-01-01 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2021-07-01 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2020-07-01 2020-09-30 0000036270 us-gaap:FairValueInputsLevel3Member us-gaap:ResidentialMortgageMember 2020-01-01 2020-09-30 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember srt:MinimumMember 2021-01-01 2021-09-30 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember srt:MaximumMember 2021-01-01 2021-09-30 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember srt:WeightedAverageMember 2021-01-01 2021-09-30 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember srt:MinimumMember 2020-01-01 2020-12-31 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember srt:MaximumMember 2020-01-01 2020-12-31 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember srt:WeightedAverageMember 2020-01-01 2020-12-31 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember 2021-09-30 0000036270 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember mtb:TwoIndependentPricingQuotesMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 mtb:OtherAssetsAndOtherLiabilitiesMember mtb:DiscountedCashFlowsMember us-gaap:FairValueMeasurementsRecurringMember 2020-12-31 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2021-09-30 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2021-09-30 0000036270 us-gaap:FairValueInputsLevel1Member 2021-09-30 0000036270 us-gaap:FairValueInputsLevel2Member 2021-09-30 0000036270 us-gaap:FairValueInputsLevel3Member 2021-09-30 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember mtb:CommercialLoansAndLeasesMember 2021-09-30 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember mtb:CommercialLoansAndLeasesMember 2021-09-30 0000036270 mtb:CommercialLoansAndLeasesMember us-gaap:FairValueInputsLevel3Member 2021-09-30 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:FairValueInputsLevel2Member 2021-09-30 0000036270 mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember us-gaap:FairValueInputsLevel3Member 2021-09-30 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember mtb:ResidentialRealEstateLoansMember 2021-09-30 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember mtb:ResidentialRealEstateLoansMember 2021-09-30 0000036270 mtb:ResidentialRealEstateLoansMember us-gaap:FairValueInputsLevel2Member 2021-09-30 0000036270 mtb:ResidentialRealEstateLoansMember us-gaap:FairValueInputsLevel3Member 2021-09-30 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2020-12-31 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel1Member 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member 2020-12-31 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember mtb:CommercialLoansAndLeasesMember 2020-12-31 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember mtb:CommercialLoansAndLeasesMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member mtb:CommercialLoansAndLeasesMember 2020-12-31 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member mtb:CommercialRealEstateExcludingResidentialBuilderAndDeveloperAndOtherConstructionMember 2020-12-31 0000036270 us-gaap:CarryingReportedAmountFairValueDisclosureMember mtb:ResidentialRealEstateLoansMember 2020-12-31 0000036270 us-gaap:EstimateOfFairValueFairValueDisclosureMember mtb:ResidentialRealEstateLoansMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel2Member mtb:ResidentialRealEstateLoansMember 2020-12-31 0000036270 us-gaap:FairValueInputsLevel3Member mtb:ResidentialRealEstateLoansMember 2020-12-31 0000036270 srt:MinimumMember 2021-09-30 0000036270 srt:MaximumMember 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:BusinessBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialRealEstateSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:DiscretionaryPortfolioMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:ResidentialMortgageBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:RetailBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:BusinessBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialRealEstateSegmentMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:DiscretionaryPortfolioMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:ResidentialMortgageBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:RetailBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember us-gaap:AllOtherSegmentsMember 2021-07-01 2021-09-30 0000036270 mtb:BusinessBankingMember 2021-07-01 2021-09-30 0000036270 mtb:CommercialBankingMember 2021-07-01 2021-09-30 0000036270 mtb:CommercialRealEstateSegmentMember 2021-07-01 2021-09-30 0000036270 mtb:DiscretionaryPortfolioMember 2021-07-01 2021-09-30 0000036270 mtb:ResidentialMortgageBankingMember 2021-07-01 2021-09-30 0000036270 mtb:RetailBankingMember 2021-07-01 2021-09-30 0000036270 us-gaap:AllOtherSegmentsMember 2021-07-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:BusinessBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialRealEstateSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:DiscretionaryPortfolioMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:ResidentialMortgageBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:RetailBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:BusinessBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialRealEstateSegmentMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:DiscretionaryPortfolioMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:ResidentialMortgageBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:RetailBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember us-gaap:AllOtherSegmentsMember 2020-07-01 2020-09-30 0000036270 mtb:BusinessBankingMember 2020-07-01 2020-09-30 0000036270 mtb:CommercialBankingMember 2020-07-01 2020-09-30 0000036270 mtb:CommercialRealEstateSegmentMember 2020-07-01 2020-09-30 0000036270 mtb:DiscretionaryPortfolioMember 2020-07-01 2020-09-30 0000036270 mtb:ResidentialMortgageBankingMember 2020-07-01 2020-09-30 0000036270 mtb:RetailBankingMember 2020-07-01 2020-09-30 0000036270 us-gaap:AllOtherSegmentsMember 2020-07-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:BusinessBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialRealEstateSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:DiscretionaryPortfolioMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:ResidentialMortgageBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:RetailBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:BusinessBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialRealEstateSegmentMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:DiscretionaryPortfolioMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:ResidentialMortgageBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:RetailBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:IntersegmentEliminationMember us-gaap:AllOtherSegmentsMember 2021-01-01 2021-09-30 0000036270 mtb:BusinessBankingMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialBankingMember 2021-01-01 2021-09-30 0000036270 mtb:CommercialRealEstateSegmentMember 2021-01-01 2021-09-30 0000036270 mtb:DiscretionaryPortfolioMember 2021-01-01 2021-09-30 0000036270 mtb:ResidentialMortgageBankingMember 2021-01-01 2021-09-30 0000036270 mtb:RetailBankingMember 2021-01-01 2021-09-30 0000036270 us-gaap:AllOtherSegmentsMember 2021-01-01 2021-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:BusinessBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:CommercialRealEstateSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:DiscretionaryPortfolioMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:ResidentialMortgageBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember mtb:RetailBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2020-01-01 2020-09-30 0000036270 us-gaap:OperatingSegmentsMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:BusinessBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:CommercialRealEstateSegmentMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:DiscretionaryPortfolioMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:ResidentialMortgageBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember mtb:RetailBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:IntersegmentEliminationMember us-gaap:AllOtherSegmentsMember 2020-01-01 2020-09-30 0000036270 mtb:BusinessBankingMember 2020-01-01 2020-09-30 0000036270 mtb:CommercialBankingMember 2020-01-01 2020-09-30 0000036270 mtb:CommercialRealEstateSegmentMember 2020-01-01 2020-09-30 0000036270 mtb:DiscretionaryPortfolioMember 2020-01-01 2020-09-30 0000036270 mtb:ResidentialMortgageBankingMember 2020-01-01 2020-09-30 0000036270 mtb:RetailBankingMember 2020-01-01 2020-09-30 0000036270 us-gaap:AllOtherSegmentsMember 2020-01-01 2020-09-30 0000036270 mtb:BusinessBankingMember 2021-09-30 0000036270 mtb:CommercialBankingMember 2021-09-30 0000036270 mtb:CommercialRealEstateSegmentMember 2021-09-30 0000036270 mtb:DiscretionaryPortfolioMember 2021-09-30 0000036270 mtb:ResidentialMortgageBankingMember 2021-09-30 0000036270 mtb:RetailBankingMember 2021-09-30 0000036270 us-gaap:AllOtherSegmentsMember 2021-09-30 0000036270 mtb:BusinessBankingMember 2020-09-30 0000036270 mtb:CommercialBankingMember 2020-09-30 0000036270 mtb:CommercialRealEstateSegmentMember 2020-09-30 0000036270 mtb:DiscretionaryPortfolioMember 2020-09-30 0000036270 mtb:ResidentialMortgageBankingMember 2020-09-30 0000036270 mtb:RetailBankingMember 2020-09-30 0000036270 us-gaap:AllOtherSegmentsMember 2020-09-30 0000036270 mtb:BusinessBankingMember 2020-12-31 0000036270 mtb:CommercialBankingMember 2020-12-31 0000036270 mtb:CommercialRealEstateSegmentMember 2020-12-31 0000036270 mtb:DiscretionaryPortfolioMember 2020-12-31 0000036270 mtb:ResidentialMortgageBankingMember 2020-12-31 0000036270 mtb:RetailBankingMember 2020-12-31 0000036270 us-gaap:AllOtherSegmentsMember 2020-12-31 0000036270 mtb:BayviewLendingGroupMember 2021-09-30 0000036270 mtb:OtherRevenuesFromOperationsMember mtb:BayviewLendingGroupMember 2020-01-01 2020-09-30 0000036270 mtb:OtherRevenuesFromOperationsMember mtb:BayviewLendingGroupMember 2021-01-01 2021-09-30 0000036270 mtb:OtherRevenuesFromOperationsMember mtb:BayviewLendingGroupMember 2020-07-01 2020-09-30 0000036270 mtb:BayviewLendingGroupAndBayviewFinancialMember 2021-09-30 0000036270 mtb:BayviewLendingGroupAndBayviewFinancialMember 2020-12-31 0000036270 mtb:BayviewLendingGroupAndBayviewFinancialMember 2021-07-01 2021-09-30 0000036270 mtb:BayviewLendingGroupAndBayviewFinancialMember 2020-07-01 2020-09-30 0000036270 mtb:BayviewLendingGroupAndBayviewFinancialMember 2021-01-01 2021-09-30 0000036270 mtb:BayviewLendingGroupAndBayviewFinancialMember 2020-01-01 2020-09-30 0000036270 mtb:BayviewFinancialMember 2021-09-30 0000036270 mtb:BayviewFinancialMember 2020-12-31 0000036270 mtb:BayviewFinancialMember 2021-07-01 2021-09-30 0000036270 mtb:BayviewFinancialMember 2020-07-01 2020-09-30 0000036270 mtb:BayviewFinancialMember 2021-01-01 2021-09-30 0000036270 mtb:BayviewFinancialMember 2020-01-01 2020-09-30 0000036270 mtb:BayviewFinancialMember mtb:SyndicatedLoanFacilityMember 2021-09-30 0000036270 mtb:BayviewFinancialMember mtb:SyndicatedLoanFacilityMember us-gaap:ParentMember 2021-09-30 0000036270 mtb:BayviewFinancialMember us-gaap:FederalHousingAdministrationLoanMember 2021-09-30

 

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

 

FORM 10-Q

 

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2021

or

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 1-9861

 

M&T BANK CORPORATION

(Exact name of registrant as specified in its charter)

 

 

New York

 

16-0968385

(State or other jurisdiction of

incorporation or organization)

 

(I.R.S. Employer

Identification No.)

 

 

 

One M & T Plaza

Buffalo, New York

 

14203

(Address of principal executive offices)

 

(Zip Code)

Registrant's telephone number, including area code:

(716) 635-4000

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

Trading Symbols

Name of Each Exchange on Which Registered

Common Stock, $.50 par value

MTB

New York Stock Exchange

 

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.      Yes      No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).       Yes      No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company.  See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

 

 

Accelerated filer

Non-accelerated filer

 

  

Smaller reporting company

Emerging growth company

 

 

 

 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).       Yes      No

Number of shares of the registrant's Common Stock, $0.50 par value, outstanding as of the close of business on October 29, 2021: 128,684,567 shares.

 

 

 


M&T BANK CORPORATION

FORM 10-Q

For the Quarterly Period Ended September 30, 2021

 

Table of Contents of Information Required in Report

 

Page

 

 

 

 

 

Part I.  FINANCIAL INFORMATION

 

 

 

 

 

 

 

Item 1.

 

Financial Statements.

 

 

 

 

 

 

 

 

 

CONSOLIDATED BALANCE SHEET – September 30, 2021 and December 31, 2020

 

3

 

 

 

 

 

 

 

CONSOLIDATED STATEMENT OF INCOME – Three and nine months ended September 30, 2021 and 2020

 

4

 

 

 

 

 

 

 

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME – Three and nine months ended September 30, 2021 and 2020

 

5

 

 

 

 

 

 

 

CONSOLIDATED STATEMENT OF CASH FLOWS – Nine months ended September 30, 2021 and 2020

 

6

 

 

 

 

 

 

 

CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY – Three and nine months ended September 30, 2021 and 2020

 

7

 

 

 

 

 

 

 

NOTES TO FINANCIAL STATEMENTS

 

8

 

 

 

 

 

Item 2.

 

Management's Discussion and Analysis of Financial Condition and Results of Operations.

 

54

 

 

 

 

 

Item 3.

 

Quantitative and Qualitative Disclosures About Market Risk.

 

92

 

 

 

 

 

Item 4.

 

Controls and Procedures.

 

92

 

 

 

 

 

Part II. OTHER INFORMATION

 

 

 

 

 

 

 

Item 1.

 

Legal Proceedings

 

92

 

 

 

 

 

Item 1A.

 

Risk Factors.

 

92

 

 

 

 

 

Item 2.

 

Unregistered Sales of Equity Securities and Use of Proceeds

 

96

 

 

 

 

 

Item 3.

 

Defaults Upon Senior Securities.

 

96

 

 

 

 

 

Item 4.

 

Mine Safety Disclosures.

 

96

 

 

 

 

 

Item 5.

 

Other Information.

 

96

 

 

 

 

 

Item 6.

 

Exhibits.

 

97

 

 

 

 

 

SIGNATURES

 

98

 

 

 

 

 

 

 

 

- 2 -


PART I. FINANCIAL INFORMATION

Item 1. Financial Statements.

M&T BANK CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEET (Unaudited)

 

 

 

September 30,

 

 

December 31,

 

(Dollars in thousands, except per share)

 

2021

 

 

2020

 

Assets

 

 

 

 

 

 

 

 

Cash and due from banks

 

$

1,479,712

 

 

$

1,552,743

 

Interest-bearing deposits at banks

 

 

38,445,788

 

 

 

23,663,810

 

Trading account

 

 

624,556

 

 

 

1,068,581

 

Investment securities (includes pledged securities that can be sold or repledged of

   $118,178 at September 30, 2021; $105,136 at December 31, 2020)

 

 

 

 

 

 

 

 

Available for sale (cost: $3,473,923 at September 30, 2021;

   $4,621,027 at December 31, 2020

 

 

3,618,106

 

 

 

4,822,606

 

Held to maturity (fair value: $2,413,938 at September 30, 2021;

   $1,842,281 at December 31, 2020)

 

 

2,359,727

 

 

 

1,748,989

 

Equity and other securities (cost: $467,349 at September 30, 2021;

   $449,008 at December 31, 2020)

 

 

469,789

 

 

 

474,102

 

Total investment securities

 

 

6,447,622

 

 

 

7,045,697

 

Loans and leases

 

 

93,872,912

 

 

 

98,875,788

 

Unearned discount

 

 

(290,018

)

 

 

(339,921

)

Loans and leases, net of unearned discount

 

 

93,582,894

 

 

 

98,535,867

 

Allowance for credit losses

 

 

(1,515,024

)

 

 

(1,736,387

)

Loans and leases, net

 

 

92,067,870

 

 

 

96,799,480

 

Premises and equipment

 

 

1,117,903