0000036146Q3--12-31falsehttp://fasb.org/us-gaap/2025#GainLossOnSaleOfBusinesshttp://www.trustmark.com/20250930#MortgageBankingIncomehttp://www.trustmark.com/20250930#MortgageBankingIncomeP1Yhttp://fasb.org/us-gaap/2025#PropertyPlantAndEquipmentNethttp://fasb.org/us-gaap/2025#PropertyPlantAndEquipmentNethttp://fasb.org/us-gaap/2025#OtherBorrowingshttp://fasb.org/us-gaap/2025#OtherBorrowingshttp://fasb.org/us-gaap/2025#OtherAssetshttp://fasb.org/us-gaap/2025#OtherLiabilitieshttp://fasb.org/us-gaap/2025#OtherAssetshttp://fasb.org/us-gaap/2025#OtherLiabilitieshttp://fasb.org/srt/2025#ChiefExecutiveOfficerMember0000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-09-300000036146trmk:ResidentialMortgagePassThroughSecuritiesGuaranteedByGNMAMember2024-12-310000036146trmk:ConstructionLandDevelopmentAndOtherLandPropertiesMember2025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-09-300000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:CommercialAndIndustrialNonWorkingCapitalMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-07-012025-09-300000036146us-gaap:FinancialAssetPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-07-012024-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2025-01-012025-03-310000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146trmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2024-01-012024-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2025-01-012025-09-300000036146us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2025-07-012025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMembertrmk:NonownerOccupiedAllOtherMember2025-01-012025-09-300000036146us-gaap:FinancingReceivables60To89DaysPastDueMember2024-12-310000036146us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-09-300000036146us-gaap:ConstructionLoansMemberus-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:UnimprovedLandMember2024-01-012024-12-310000036146us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:CommercialPortfolioSegmentMember2024-09-300000036146trmk:MiscellaneousMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:WealthManagementMember2025-07-012025-09-3000000361462024-04-012024-06-300000036146trmk:CommercialAndIndustrialLoansMembertrmk:CommercialAndIndustrialWorkingCapitalMemberus-gaap:CommercialPortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2025-07-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2024-12-310000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2024-01-012024-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2024-12-310000036146trmk:FamilyMortgageLoansMember2024-07-012024-09-300000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:EquipmentFinanceLeasesMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-01-012024-12-310000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:CommercialAndIndustrialWorkingCapitalMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-01-012024-12-310000036146trmk:OtherResidentialFinancingReceivableMembertrmk:TroubledDebtRestructuringsMember2025-01-012025-09-300000036146trmk:TrustmarkCorporationMembertrmk:Tier1LeverageToAverageAssetsMember2025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-07-012025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:NonownerOccupiedHotelMotelMembertrmk:SecuredByNonfarmNonresidentialPropertiesMember2025-01-012025-09-300000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2025-06-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetNotPastDueMember2025-09-300000036146us-gaap:ConstructionLoansMembertrmk:LotsAndDevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146trmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146trmk:CommercialAndIndustrialLoansMembertrmk:CreditCardsMemberus-gaap:CommercialPortfolioSegmentMember2024-01-012024-12-3100000361462025-10-310000036146trmk:GeneralBankingMembertrmk:InternalAllocationsMember2024-01-012024-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2024-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageServicingRightsHedgeMember2025-01-012025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMember2024-12-310000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-03-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-06-300000036146us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-06-300000036146us-gaap:StandbyLettersOfCreditMember2024-09-300000036146us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:ConsumerBorrowerMember2025-01-012025-09-300000036146trmk:OtherConstructionMemberus-gaap:CommercialBorrowerMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:PassMember2024-12-310000036146trmk:GeneralBankingMember2024-07-012024-09-300000036146trmk:FinancingReceivablesCurrentDueMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-01-012024-09-300000036146trmk:BeneficiaryMemberus-gaap:NondesignatedMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2023-12-310000036146us-gaap:NondesignatedMembertrmk:MortgageServicingRightsHedgeMember2024-01-012024-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:OtherRealEstateSecuredFinancingReceivableMembertrmk:NonresidentialNonownerOccupiedApartmentsMember2025-01-012025-09-300000036146trmk:GeneralBankingMembertrmk:AccountingStandardsUpdate2014-09Member2025-07-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-01-012024-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-07-012024-09-300000036146us-gaap:USTreasurySecuritiesMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:DoubtfulMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:InterestRateLockCommitmentsMemberus-gaap:NondesignatedMember2025-09-300000036146us-gaap:SegmentContinuingOperationsMember2024-01-012024-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2024-01-012024-09-300000036146stpr:MS2025-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-01-012024-09-300000036146us-gaap:RetainedEarningsMember2024-03-310000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-300000036146us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2023-12-310000036146us-gaap:ConsumerPortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancialAssetNotPastDueMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-07-012024-09-300000036146us-gaap:FinancialAssetNotPastDueMember2025-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2024-09-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:WealthManagementMember2024-07-012024-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-09-300000036146trmk:AccountingStandardsUpdate2014-09Member2025-01-012025-09-300000036146trmk:NonresidentialOwnerOccupiedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMember2024-01-012024-12-310000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Member2024-07-012024-09-300000036146us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2025-09-300000036146us-gaap:AvailableforsaleSecuritiesMember2025-09-300000036146trmk:StockAndIncentiveCompensationPlanMember2024-01-012024-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146trmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:VehiclesMember2025-09-300000036146us-gaap:RealEstateMember2024-12-310000036146trmk:ObligationsOfStateAndPoliticalSubdivisionsMembertrmk:StateAndOtherPoliticalSubdivisionLoansMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-01-012024-12-310000036146trmk:OtherResidentialFinancingReceivableMembertrmk:AllOtherConsumerMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:CommercialAndIndustrialNonWorkingCapitalMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-01-012024-12-310000036146us-gaap:ConstructionLoansMembertrmk:FamilyResidentialConstructionMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:FinancialGuaranteeMemberus-gaap:NondesignatedMember2025-09-300000036146trmk:FinancingReceivablesCurrentDueMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-01-012024-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-06-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Member2025-07-012025-09-300000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146trmk:GeneralBankingMember2024-01-012024-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-12-310000036146trmk:ConstructionLandDevelopmentAndOtherLandPropertiesMember2024-12-310000036146us-gaap:RealEstateMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146trmk:TrustmarkCorporationPensionPlanForCertainEmployeesOfAcquiredFinancialInstitutionsMemberus-gaap:PensionPlansDefinedBenefitMember2024-07-012024-09-300000036146us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-01-012025-09-300000036146us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-06-300000036146trmk:TrustmarkCorporationMembertrmk:Tier1CapitalToRiskWeightedAssetsMember2024-12-310000036146us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2025-01-012025-09-300000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146trmk:OtherResidentialMortgageBackedSecuritiesIssuedOrGuaranteedByFNMAFHLMCOrGNMAMember2024-12-310000036146trmk:AccountingStandardsUpdate2014-09Membertrmk:WealthManagementMember2024-01-012024-09-300000036146us-gaap:RealEstateMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146trmk:ResidentialMortgagePassThroughSecuritiesIssuedByFNMAAndFHLMCMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2024-12-310000036146us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForwardContractsMember2025-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:OtherConstructionFinancingReceivableMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetNotPastDueMembertrmk:OtherConstructionFinancingReceivableMember2025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember2025-07-012025-09-300000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2024-12-310000036146us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember2024-12-310000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:EquipmentFinanceLeasesMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-01-012025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:TroubledDebtRestructuringsMember2024-01-012024-09-300000036146us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetNotPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:CommonStockMember2024-07-012024-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMember2025-07-012025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2024-03-310000036146us-gaap:VehiclesMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:ResidentialMortgagePassThroughSecuritiesGuaranteedByGNMAMember2024-01-012024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2025-09-300000036146us-gaap:CommercialBorrowerMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2024-07-012024-09-300000036146us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2024-01-012024-09-300000036146us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:USTreasurySecuritiesMember2025-09-300000036146us-gaap:FinancingReceivables60To89DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMember2024-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMember2024-12-310000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMembertrmk:NonownerOccupiedOfficeMember2024-01-012024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForwardContractsMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMember2025-01-012025-09-300000036146stpr:AL2025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrmk:MortgageServicingRightsMember2024-01-012024-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMember2025-09-300000036146trmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:OtherAssetsMember2024-12-310000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:GeneralBankingMember2025-07-012025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-03-310000036146us-gaap:AdditionalPaidInCapitalMember2025-07-012025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:GeneralBankingMember2025-01-012025-09-300000036146trmk:TroubledDebtRestructuringsMember2024-01-012024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-01-012025-09-300000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-01-012025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:FinancingReceivablesCurrentDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:FamilyMortgageLoansMember2025-01-012025-09-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:GeneralBankingMember2024-07-012024-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-01-012024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-09-300000036146trmk:CommercialAndIndustrialLoansMemberus-gaap:CommercialPortfolioSegmentMembertrmk:EquipmentFinanceLoansMember2024-01-012024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310000036146us-gaap:NondesignatedMembertrmk:BankcardAndOtherFeesMember2025-01-012025-09-300000036146us-gaap:CreditDefaultSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2024-12-310000036146us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-12-310000036146trmk:CommercialAndIndustrialLoansMembertrmk:CommercialAndIndustrialNonWorkingCapitalMemberus-gaap:CommercialPortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146trmk:TimeVestedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2025-06-300000036146trmk:GeneralBankingMember2025-07-012025-09-300000036146us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146trmk:PerformanceUnitsMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:DoubtfulMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146us-gaap:FinancialAssetNotPastDueMembertrmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2024-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:FinancingReceivablesCurrentDueMembertrmk:ResidentialFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrmk:MortgageServicingRightsMember2025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-07-012024-09-300000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:OtherLoansMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-01-012024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetNotPastDueMember2024-12-310000036146trmk:ConsumerFamilyFirstLiensMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-09-300000036146trmk:CommercialAndIndustrialLoansMembertrmk:CommercialAndIndustrialWorkingCapitalMemberus-gaap:CommercialPortfolioSegmentMember2025-01-012025-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-06-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2024-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetNotPastDueMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Member2024-01-012024-09-300000036146trmk:TrustmarkBankMembertrmk:Tier1LeverageToAverageAssetsMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:OtherConstructionFinancingReceivableMember2025-09-300000036146us-gaap:CreditDefaultSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2024-12-310000036146us-gaap:InterestRateSwapMember2025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:OtherRealEstateSecuredFinancingReceivableMembertrmk:NonresidentialNonownerOccupiedApartmentsMember2024-01-012024-12-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-300000036146us-gaap:StandbyLettersOfCreditMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMember2024-01-012024-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:ConsumerLoansMembertrmk:OverdraftsMember2025-01-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:MiscellaneousMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-300000036146us-gaap:CommonStockMember2024-01-012024-03-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancialAssetPastDueMember2025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146trmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:ConsumerBorrowerMember2025-01-012025-09-300000036146trmk:MoodySAa1ToAa3RatingMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:TroubledDebtRestructuringsMember2024-07-012024-09-3000000361462023-12-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:ConsumerBorrowerMember2024-01-012024-12-310000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-01-012024-12-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMember2024-12-310000036146us-gaap:NondesignatedMemberus-gaap:ForwardContractsMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMembertrmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2024-01-012024-12-310000036146trmk:OtherResidentialMortgageBackedSecuritiesIssuedOrGuaranteedByFNMAFHLMCOrGNMAMember2025-01-012025-09-300000036146trmk:TimeBasedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2024-01-012024-09-3000000361462024-03-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMember2025-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146trmk:ResidentialMortgagePassThroughSecuritiesIssuedByFNMAAndFHLMCMember2025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMembertrmk:NonOwnerOccupiedRetailMember2025-01-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMember2024-01-012024-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-09-300000036146us-gaap:CreditDefaultSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2025-09-300000036146us-gaap:NondesignatedMemberus-gaap:ForwardContractsMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMember2025-06-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:PassMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:FinancialAssetNotPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMember2024-07-012024-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2025-09-300000036146us-gaap:InterestRateSwapMember2024-12-310000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2023-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-12-310000036146us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2025-01-012025-09-300000036146trmk:ResidentialMortgagePassThroughSecuritiesIssuedByFNMAAndFHLMCMember2024-01-012024-12-310000036146us-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-3000000361462024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146trmk:TrustmarkCorporationPensionPlanForCertainEmployeesOfAcquiredFinancialInstitutionsMemberus-gaap:PensionPlansDefinedBenefitMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:DoubtfulMember2025-09-300000036146us-gaap:FutureMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146trmk:TrustmarkCorporationPensionPlanForCertainEmployeesOfAcquiredFinancialInstitutionsMemberus-gaap:PensionPlansDefinedBenefitMember2024-01-012024-09-300000036146srt:ManagementMembertrmk:TimeBasedAwardMember2025-01-012025-09-300000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:CommercialAndIndustrialWorkingCapitalMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-01-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2023-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:TroubledDebtRestructuringsMember2025-01-012025-09-300000036146stpr:TN2025-09-300000036146trmk:AccountingStandardsUpdate2014-09Membertrmk:WealthManagementMember2025-01-012025-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:NondesignatedMembertrmk:ExchangeTradedWrittenOptionsMemberus-gaap:OtherLiabilitiesMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetPastDueMember2025-09-300000036146trmk:TrustmarkCorporationPensionPlanForCertainEmployeesOfAcquiredFinancialInstitutionsMemberus-gaap:PensionPlansDefinedBenefitMember2025-07-012025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-09-300000036146us-gaap:ConstructionLoansMembertrmk:FamilyResidentialConstructionMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-09-300000036146trmk:AccountingStandardsUpdate2014-09Member2024-01-012024-09-300000036146us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2024-12-310000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-09-300000036146trmk:WealthManagementMember2025-09-300000036146us-gaap:CommonStockMember2025-04-012025-06-300000036146trmk:NonresidentialOwnerOccupiedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-01-012024-12-310000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:OtherAssetsMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:FutureMemberus-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionFinancingReceivableMember2024-12-310000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:InterestRateLockCommitmentsMemberus-gaap:NondesignatedMember2024-01-012024-12-310000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-3100000361462025-07-012025-09-300000036146srt:MinimumMember2025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherAssetsMemberus-gaap:InterestRateFloorMember2025-09-300000036146trmk:CommercialAndIndustrialLoansMembertrmk:CreditCardsMemberus-gaap:CommercialPortfolioSegmentMember2025-01-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146trmk:LoansHeldForInvestmentMember2024-07-012024-09-3000000361462025-01-012025-03-310000036146trmk:OtherRealEstatePropertiesMember2025-09-300000036146us-gaap:CommercialMortgageBackedSecuritiesMember2024-12-310000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMember2025-09-300000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2025-01-012025-09-300000036146us-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2024-07-012024-09-300000036146trmk:TrustmarkBankMembertrmk:CapitalToRiskWeightedAssetsMember2024-12-310000036146trmk:InvestmentSecuritiesPortfolioMember2024-06-300000036146us-gaap:InterestRateSwapMemberus-gaap:NondesignatedMember2024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrmk:MortgageServicingRightsMember2025-01-012025-09-300000036146us-gaap:FutureMemberus-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2025-09-300000036146us-gaap:InterestRateSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2024-09-300000036146trmk:OtherConstructionMemberus-gaap:CommercialBorrowerMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:PassMember2025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:ConsumerLoansMembertrmk:OverdraftsMember2024-01-012024-12-310000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-07-012025-09-300000036146trmk:WealthManagementMember2024-09-300000036146trmk:AccountingStandardsUpdate2014-09Member2024-07-012024-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:FinancingReceivablesCurrentDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-09-300000036146trmk:LoansHeldForInvestmentMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:SubstandardMember2024-12-310000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:OtherLiabilitiesMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancialAssetPastDueMember2024-12-310000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherAssetsMemberus-gaap:InterestRateFloorMember2024-12-310000036146trmk:FinancingReceivablesCurrentDueMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2025-04-012025-06-300000036146us-gaap:ConstructionLoansMembertrmk:AllOtherConsumerMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-09-3000000361462024-01-012024-03-310000036146us-gaap:VehiclesMember2024-12-310000036146us-gaap:CommercialPortfolioSegmentMember2025-06-300000036146trmk:GeneralBankingMembertrmk:InternalAllocationsMember2025-01-012025-09-300000036146trmk:OtherResidentialMortgageBackedSecuritiesIssuedOrGuaranteedByFNMAFHLMCOrGNMAMember2025-09-300000036146us-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:InterestRateLockCommitmentsMemberus-gaap:NondesignatedMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-300000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:StandbyLettersOfCreditMember2025-01-012025-09-300000036146us-gaap:NondesignatedMembertrmk:BankcardAndOtherFeesMember2024-01-012024-09-300000036146us-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateFloorMember2024-12-310000036146us-gaap:ConsumerBorrowerMember2024-01-012024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMember2025-09-300000036146trmk:OtherCommercialLoansAndLeasesMembertrmk:OtherLoansMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-01-012025-09-300000036146us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-01-012024-12-310000036146trmk:TimeBasedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2025-01-012025-09-300000036146us-gaap:AccountingStandardsUpdate202307Member2025-09-300000036146trmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMembertrmk:NonresidentialOwnerOccupiedMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2025-07-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:CommonStockMember2024-04-012024-06-300000036146us-gaap:SegmentContinuingOperationsMember2025-09-300000036146us-gaap:RealEstateMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2024-07-012024-09-300000036146trmk:TrustmarkBankMembertrmk:Tier1CapitalToRiskWeightedAssetsMember2024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-09-300000036146trmk:StockAndIncentiveCompensationPlanMember2024-07-012024-09-300000036146us-gaap:FinancialAssetPastDueMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:DoubtfulMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageServicingRightsHedgeMember2024-07-012024-09-300000036146us-gaap:MortgageBackedSecuritiesOtherMember2024-12-310000036146trmk:ObligationsOfStateAndPoliticalSubdivisionsMembertrmk:StateAndOtherPoliticalSubdivisionLoansMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-01-012025-09-300000036146trmk:GeneralBankingMembertrmk:AccountingStandardsUpdate2014-09Member2024-07-012024-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMember2024-12-310000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-07-012024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-01-012025-09-3000000361462024-07-012024-09-300000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-07-012025-09-300000036146trmk:InternalAllocationsMembertrmk:WealthManagementMember2024-01-012024-09-300000036146us-gaap:FinancialAssetPastDueMember2024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrmk:MortgageServicingRightsMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:SpecialMentionMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146trmk:MiscellaneousMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2024-07-012024-09-300000036146trmk:TrustmarkCorporationMembertrmk:CommonEquityTier1CapitalToRiskWeightedAssetsMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:OtherConstructionFinancingReceivableMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMember2024-07-012024-09-300000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2023-12-310000036146trmk:TimeVestedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2025-09-300000036146trmk:NonfarmNonresidentialPropertiesMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:PassMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146us-gaap:CommercialBorrowerMember2025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-06-300000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetNotPastDueMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2024-07-012024-09-300000036146us-gaap:CommonStockMember2025-03-310000036146trmk:InternalAllocationsMembertrmk:WealthManagementMember2025-01-012025-09-300000036146trmk:GeneralBankingMember2024-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:OtherRealEstateSecuredFinancingReceivableMembertrmk:NonownerOccupiedAllOtherMember2024-01-012024-12-310000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:WealthManagementMember2024-01-012024-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:PensionPlansDefinedBenefitMembersrt:ScenarioForecastMember2025-01-012025-12-310000036146trmk:FamilyResidential14PropertiesMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMembertrmk:NonresidentialOwnerOccupiedMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:PassMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2025-01-012025-09-300000036146us-gaap:CommercialMortgageBackedSecuritiesMember2024-01-012024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMember2025-09-300000036146trmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember2024-12-310000036146trmk:FinancingReceivablesCurrentDueMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:AdditionalPaidInCapitalMember2025-03-310000036146trmk:StockAndIncentiveCompensationPlanMember2025-07-012025-09-300000036146trmk:TimeVestedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:CommercialPortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:FinancingReceivablesCurrentDueMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2023-12-310000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2023-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2024-12-310000036146trmk:TimeVestedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2024-12-310000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMembertrmk:NonOwnerOccupiedRetailMember2024-01-012024-12-310000036146us-gaap:RetainedEarningsMember2024-04-012024-06-300000036146trmk:OtherResidentialFinancingReceivableMembertrmk:AllOtherConsumerMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrmk:MortgageServicingRightsMember2024-09-300000036146us-gaap:AdditionalPaidInCapitalMember2023-12-310000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Member2025-01-012025-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-07-012025-09-3000000361462025-03-310000036146srt:DirectorMembertrmk:TimeBasedAwardMember2025-01-012025-09-300000036146us-gaap:InterestRateSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancialAssetNotPastDueMembertrmk:OtherConstructionFinancingReceivableMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:RetainedEarningsMember2024-07-012024-09-300000036146us-gaap:NondesignatedMembertrmk:BankcardAndOtherFeesMember2025-07-012025-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageBankingNetMember2024-01-012024-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146trmk:BeneficiaryMemberus-gaap:NondesignatedMember2025-09-300000036146us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-01-012024-09-300000036146us-gaap:RetainedEarningsMember2024-01-012024-03-310000036146trmk:MiscellaneousMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2025-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:SpecialMentionMember2025-09-300000036146trmk:NonresidentialOwnerOccupiedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-01-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMember2024-06-300000036146trmk:OTCWrittenOptionsMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2024-12-310000036146us-gaap:NondesignatedMembertrmk:ExchangeTradedWrittenOptionsMemberus-gaap:OtherLiabilitiesMember2025-09-300000036146us-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146trmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:SpecialMentionMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember2024-12-310000036146us-gaap:AdditionalPaidInCapitalMember2024-04-012024-06-300000036146trmk:TrustmarkCorporationMembertrmk:CapitalToRiskWeightedAssetsMember2024-12-310000036146trmk:GeneralBankingMembertrmk:InternalAllocationsMember2025-07-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherConstructionFinancingReceivableMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMember2025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:PassMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2024-01-012024-03-310000036146us-gaap:ConsumerPortfolioSegmentMember2025-09-300000036146us-gaap:AdditionalPaidInCapitalMember2024-06-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-03-3100000361462024-01-012024-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:OtherConstructionFinancingReceivableMember2025-09-300000036146us-gaap:PensionPlansDefinedBenefitMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:FinancialAssetPastDueMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2024-09-300000036146us-gaap:FinancingReceivables60To89DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:GeneralBankingMember2024-01-012024-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMembertrmk:NonownerOccupiedAllOtherMember2024-01-012024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2025-09-300000036146trmk:OtherResidentialFinancingReceivableMember2025-09-300000036146trmk:TrustmarkCorporationMembertrmk:Tier1CapitalToRiskWeightedAssetsMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMember2025-07-012025-09-300000036146us-gaap:RealEstateMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146trmk:TrustmarkCorporationMembertrmk:CommonEquityTier1CapitalToRiskWeightedAssetsMember2025-09-300000036146srt:MinimumMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2024-09-300000036146trmk:LoansHeldForInvestmentMember2025-07-012025-09-300000036146trmk:MiscellaneousMember2024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146trmk:TrustmarkCorporationMembertrmk:CapitalToRiskWeightedAssetsMember2025-09-300000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2025-07-012025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:RetainedEarningsMember2025-04-012025-06-300000036146trmk:TroubledDebtRestructuringsMember2025-07-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2025-01-012025-09-300000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-01-012024-09-300000036146trmk:TrustmarkCorporationMembertrmk:Tier1LeverageToAverageAssetsMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrmk:MortgageServicingRightsMember2023-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:PassMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-3100000361462025-01-012025-09-300000036146srt:MoodysAaaRatingMember2024-12-310000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:SubstandardMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:OtherLiabilitiesMember2024-12-310000036146trmk:TimeBasedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2025-07-012025-09-300000036146trmk:AccountingStandardsUpdate2014-09Membertrmk:WealthManagementMember2025-07-012025-09-300000036146us-gaap:CommonStockMembertrmk:StockRepurchaseProgramSixMember2024-01-012024-12-310000036146stpr:TN2024-12-310000036146us-gaap:CarryingReportedAmountFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionIncludingPortionAttributableToNoncontrollingInterestMember2024-07-012024-09-300000036146us-gaap:CommercialMortgageBackedSecuritiesMember2025-01-012025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:ConsumerLoansMembertrmk:AllOtherConsumerMember2024-01-012024-12-310000036146us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:CommonStockMember2023-12-310000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2025-07-012025-09-300000036146us-gaap:NondesignatedMemberus-gaap:OtherAssetsMembertrmk:ExchangeTradedPurchasedOptionsMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMember2024-06-300000036146trmk:WealthManagementMember2024-07-012024-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:InterestRateSwapMemberus-gaap:NondesignatedMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:SubstandardMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:CommonStockMember2024-12-310000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2024-09-300000036146trmk:WealthManagementMember2025-01-012025-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:ConstructionLoansMembertrmk:AllOtherConsumerMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMember2024-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:NonownerOccupiedSeniorLivingNursingHomesMembertrmk:SecuredByNonfarmNonresidentialPropertiesMember2024-01-012024-12-310000036146trmk:TrustmarkBankMembertrmk:Tier1CapitalToRiskWeightedAssetsMember2025-09-300000036146us-gaap:RetainedEarningsMember2024-06-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146trmk:GeneralBankingMember2025-09-300000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146srt:MaximumMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:OtherConstructionFinancingReceivableMember2024-12-310000036146trmk:WealthManagementMember2024-01-012024-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancialAssetNotPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:AvailableforsaleSecuritiesMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2024-01-012024-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMember2023-12-310000036146trmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMember2024-12-310000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2025-09-300000036146trmk:AccountingStandardsUpdate2014-09Member2025-07-012025-09-300000036146us-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetTransitionIncludingPortionAttributableToNoncontrollingInterestMember2025-07-012025-09-300000036146us-gaap:FinancialAssetPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateFloorMember2025-09-300000036146us-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-07-012024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:PassMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:FutureMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2024-12-310000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:WealthManagementMember2025-01-012025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:PassMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMember2024-09-300000036146trmk:GeneralBankingMembertrmk:AccountingStandardsUpdate2014-09Member2025-01-012025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:TroubledDebtRestructuringsMember2025-07-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146trmk:OtherRealEstatePropertiesMember2024-12-310000036146trmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:FinancialAssetNotPastDueMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageServicingRightsHedgeMember2024-12-310000036146us-gaap:CommonStockMember2024-06-300000036146us-gaap:FinancialAssetPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2024-07-012024-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-01-012025-03-310000036146us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:CreditDefaultSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2025-09-300000036146srt:MoodysAaaRatingMember2025-09-300000036146us-gaap:CommercialPortfolioSegmentMember2025-07-012025-09-300000036146us-gaap:RetainedEarningsMember2025-07-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:PassMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146trmk:TroubledDebtRestructuringsMember2025-01-012025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-04-012024-06-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:TrustmarkMortgageMembertrmk:ResidentialFinancingReceivableMember2025-01-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMember2025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:ConsumerLoansMembertrmk:AllOtherConsumerMember2025-01-012025-09-300000036146us-gaap:RetainedEarningsMember2025-03-310000036146trmk:TrustmarkBankMembertrmk:CommonEquityTier1CapitalToRiskWeightedAssetsMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2025-09-300000036146us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-01-012024-09-300000036146us-gaap:CommonStockMember2024-09-300000036146trmk:GeneralBankingMembertrmk:AccountingStandardsUpdate2014-09Member2024-01-012024-09-300000036146trmk:MarshAndMclennanAgencyLlcMember2024-05-312024-05-310000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2024-12-310000036146us-gaap:CommercialPortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:FairValueInputsLevel2Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2025-01-012025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMember2024-07-012024-09-300000036146us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2024-06-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:CommercialPortfolioSegmentMember2024-07-012024-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-09-300000036146us-gaap:RetainedEarningsMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:PassMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:NonownerOccupiedHotelMotelMembertrmk:SecuredByNonfarmNonresidentialPropertiesMember2024-01-012024-12-310000036146us-gaap:CommercialBorrowerMembertrmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMember2025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:CommonStockMember2025-07-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMember2025-09-300000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-06-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-07-012025-09-300000036146trmk:ResidentialMortgagePassThroughSecuritiesGuaranteedByGNMAMember2025-01-012025-09-300000036146us-gaap:InterestRateSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146trmk:CalculatedUnderRevenueGuidanceInEffectBeforeTopics606Membertrmk:WealthManagementMember2025-07-012025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceIncludingPortionAttributableToNoncontrollingInterestMember2025-07-012025-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMembertrmk:NonownerOccupiedOfficeMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146trmk:MiscellaneousMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-01-012025-09-300000036146stpr:TX2024-12-310000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146trmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:CommercialBorrowerMember2024-12-310000036146trmk:OTCWrittenOptionsMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMembertrmk:OtherConstructionLoanPoolMember2025-01-012025-09-300000036146stpr:MS2024-12-310000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:TrustmarkMortgageMembertrmk:ResidentialFinancingReceivableMember2024-01-012024-12-310000036146us-gaap:CommercialPortfolioSegmentMember2024-01-012024-09-300000036146trmk:TroubledDebtRestructuringsMember2024-07-012024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMember2025-09-300000036146us-gaap:CommonStockMember2025-09-300000036146trmk:AccountingStandardsUpdate2024-03Member2025-09-300000036146trmk:ResidentialMortgagePassThroughSecuritiesGuaranteedByGNMAMember2025-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMember2024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2025-01-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146us-gaap:RetainedEarningsMember2023-12-310000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146stpr:AL2024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageBankingNetMember2025-01-012025-09-300000036146trmk:ResidentialFinancingReceivableMember2025-09-300000036146us-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146trmk:TrustmarkBankMembertrmk:Tier1LeverageToAverageAssetsMember2025-09-3000000361462022-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-01-012024-12-310000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-06-300000036146us-gaap:FinancialAssetNotPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146trmk:FamilyMortgageLoansMember2024-01-012024-09-3000000361462025-09-300000036146us-gaap:FinancialAssetPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMember2024-01-012024-09-300000036146us-gaap:ConsumerPortfolioSegmentMember2025-06-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMember2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146us-gaap:AdditionalPaidInCapitalMember2024-09-300000036146us-gaap:RealEstateMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2025-06-300000036146trmk:NonfarmNonresidentialPropertiesMember2024-12-310000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-06-300000036146us-gaap:CommercialBorrowerMemberus-gaap:CommercialPortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:NondesignatedMemberus-gaap:OtherAssetsMembertrmk:ExchangeTradedPurchasedOptionsMember2024-12-310000036146trmk:AccountingStandardsUpdate2014-09Membertrmk:WealthManagementMember2024-07-012024-09-300000036146us-gaap:FinancialAssetNotPastDueMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-01-012024-12-310000036146us-gaap:FinancialAssetNotPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146trmk:ResidentialMortgagePassThroughSecuritiesIssuedByFNMAAndFHLMCMember2024-12-310000036146trmk:TimeBasedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2024-07-012024-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146trmk:MiscellaneousMember2025-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-01-012025-09-300000036146us-gaap:InterestRateLockCommitmentsMemberus-gaap:NondesignatedMember2025-01-012025-09-300000036146trmk:TrustmarkBankMembertrmk:CommonEquityTier1CapitalToRiskWeightedAssetsMember2024-12-310000036146us-gaap:SegmentContinuingOperationsMember2025-07-012025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember2024-07-012024-09-300000036146us-gaap:CommercialMortgageBackedSecuritiesMember2025-09-300000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-01-012024-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMember2025-01-012025-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2025-07-012025-09-300000036146us-gaap:CommercialBorrowerMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146us-gaap:FinancialAssetPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:PassMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:ConsumerLoansMembertrmk:CreditCardsMember2025-01-012025-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageBankingNetMember2025-07-012025-09-300000036146trmk:FinancingReceivablesCurrentDueMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-06-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionFinancingReceivableMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceIncludingPortionAttributableToNoncontrollingInterestMember2024-07-012024-09-300000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:OtherConstructionFinancingReceivableMember2025-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancialAssetPastDueMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-12-310000036146trmk:CommercialAndIndustrialLoansMemberus-gaap:CommercialPortfolioSegmentMembertrmk:EquipmentFinanceLoansMember2025-01-012025-09-300000036146us-gaap:SegmentContinuingOperationsMember2024-07-012024-09-300000036146us-gaap:NondesignatedMemberus-gaap:ForwardContractsMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:PassMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146trmk:GeneralBankingMember2025-01-012025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-01-012024-12-310000036146us-gaap:CommonStockMember2025-06-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:FinancialAssetNotPastDueMember2025-09-300000036146us-gaap:ConsumerPortfolioSegmentMembertrmk:ConsumerLoansMembertrmk:CreditCardsMember2024-01-012024-12-310000036146us-gaap:AdditionalPaidInCapitalMember2025-06-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2024-07-012024-09-300000036146trmk:StockAndIncentiveCompensationPlanMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherConstructionFinancingReceivableMember2024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:PassMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2024-01-012024-09-300000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMember2024-01-012024-12-310000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2023-12-310000036146us-gaap:NondesignatedMembertrmk:MortgageServicingRightsHedgeMember2025-07-012025-09-300000036146trmk:ConsumerFamilyFirstLiensMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:USTreasurySecuritiesMember2024-01-012024-12-310000036146us-gaap:ConsumerPortfolioSegmentMember2024-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146trmk:GeneralBankingMembertrmk:InternalAllocationsMember2024-07-012024-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasurySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:WealthManagementMembertrmk:InternalAllocationsMember2024-07-012024-09-300000036146us-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-3100000361462024-05-312024-05-310000036146us-gaap:CommercialBorrowerMemberus-gaap:SpecialMentionMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146us-gaap:CommonStockMember2024-03-310000036146us-gaap:CommercialPortfolioSegmentMember2023-12-310000036146trmk:FamilyResidential14PropertiesMember2025-09-300000036146us-gaap:CommercialBorrowerMember2024-01-012024-12-310000036146trmk:TimeVestedAwardMembertrmk:StockAndIncentiveCompensationPlanMember2025-07-012025-09-300000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2023-12-310000036146us-gaap:NondesignatedMembertrmk:BankcardAndOtherFeesMember2024-07-012024-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageBankingNetMember2024-07-012024-09-300000036146us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMember2024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2024-12-310000036146us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:CommercialPortfolioSegmentMember2024-06-300000036146trmk:OtherConstructionMemberus-gaap:CommercialBorrowerMembertrmk:OtherLoansSecuredByRealEstateMember2024-01-012024-12-310000036146us-gaap:RetainedEarningsMember2025-06-300000036146us-gaap:ResidentialMortgageBackedSecuritiesMember2024-12-310000036146us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2024-01-012024-09-300000036146us-gaap:RetainedEarningsMember2024-09-300000036146us-gaap:AdditionalPaidInCapitalMember2024-12-3100000361462024-01-012024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146us-gaap:RestrictedStockUnitsRSUMember2025-01-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2025-07-012025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2025-01-012025-09-300000036146stpr:TX2025-09-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:CommercialPortfolioSegmentMember2024-12-310000036146us-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-01-012025-09-300000036146trmk:WealthManagementMembertrmk:InternalAllocationsMember2025-07-012025-09-300000036146trmk:ResidentialFinancingReceivableMemberus-gaap:RealEstateMember2025-09-300000036146us-gaap:MortgageBackedSecuritiesOtherMember2025-09-3000000361462025-06-300000036146us-gaap:HeldtomaturitySecuritiesMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-07-012025-09-300000036146trmk:PerformanceUnitsMembertrmk:StockAndIncentiveCompensationPlanMember2024-07-012024-09-300000036146trmk:MoodySAa1ToAa3RatingMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-01-012025-09-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-06-300000036146us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-09-300000036146us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember2025-01-012025-09-300000036146trmk:StockRepurchaseProgramSevenMember2024-12-030000036146us-gaap:FinancialAssetNotPastDueMembertrmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:OtherConstructionMembertrmk:OtherConstructionLoanPoolMember2024-01-012024-12-310000036146trmk:CommercialAndIndustrialLoansMembertrmk:CommercialAndIndustrialNonWorkingCapitalMemberus-gaap:CommercialPortfolioSegmentMember2024-01-012024-12-310000036146us-gaap:CommercialBorrowerMemberus-gaap:DoubtfulMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146trmk:FinancingReceivablesCurrentDueMemberus-gaap:RealEstateMemberus-gaap:ConsumerBorrowerMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2025-09-3000000361462024-06-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancialAssetPastDueMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:DoubtfulMember2024-12-310000036146us-gaap:RealEstateMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2025-09-300000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:OtherRealEstateSecuredFinancingReceivableMembertrmk:NonownerOccupiedAllOtherMember2025-01-012025-09-300000036146us-gaap:VehiclesMemberus-gaap:CommercialPortfolioSegmentMember2025-09-300000036146trmk:StockRepurchaseProgramSixMember2023-12-050000036146us-gaap:ConstructionLoansMemberus-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:UnimprovedLandMember2025-01-012025-09-300000036146us-gaap:ConstructionLoansMembertrmk:LotsAndDevelopmentMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2025-01-012025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-06-300000036146us-gaap:HeldtomaturitySecuritiesMember2024-12-310000036146trmk:ResidentialFinancingReceivableMember2024-12-310000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables30To59DaysPastDueMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:PassMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146trmk:NonresidentialOwnerOccupiedMemberus-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:SecuredByNonfarmNonresidentialPropertiesMember2025-01-012025-09-300000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2024-06-300000036146us-gaap:NondesignatedMemberus-gaap:ForwardContractsMember2024-01-012024-12-310000036146us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2025-09-300000036146trmk:FamilyMortgageLoansMember2025-07-012025-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-09-300000036146trmk:ResidentialFinancingReceivableMemberus-gaap:RealEstateMember2024-12-310000036146us-gaap:CommercialRealEstatePortfolioSegmentMembertrmk:NonownerOccupiedSeniorLivingNursingHomesMembertrmk:SecuredByNonfarmNonresidentialPropertiesMember2025-01-012025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:ConsumerBorrowerMember2024-01-012024-12-310000036146us-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:RetainedEarningsMember2025-01-012025-03-310000036146us-gaap:CommonStockMember2025-01-012025-03-310000036146us-gaap:RealEstateMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-06-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMembertrmk:FinancingReceivables30To89DaysPastDueMemberus-gaap:ConsumerBorrowerMember2025-09-300000036146us-gaap:InterestRateSwapMemberus-gaap:NondesignatedMemberus-gaap:OtherAssetsMember2025-09-300000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-07-012024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:SubstandardMemberus-gaap:RealEstateMember2025-09-300000036146us-gaap:CommercialBorrowerMemberus-gaap:RealEstateMemberus-gaap:SpecialMentionMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-09-300000036146us-gaap:SegmentContinuingOperationsMember2024-09-3000000361462025-04-012025-06-300000036146us-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2024-12-310000036146trmk:StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember2025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables30To59DaysPastDueMember2025-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMemberus-gaap:PassMember2025-09-300000036146us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2025-07-012025-09-300000036146us-gaap:DesignatedAsHedgingInstrumentMember2025-07-012025-09-300000036146us-gaap:FinancialGuaranteeMemberus-gaap:NondesignatedMember2024-12-310000036146trmk:OtherResidentialMortgageBackedSecuritiesIssuedOrGuaranteedByFNMAFHLMCOrGNMAMember2024-01-012024-12-310000036146us-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2024-12-310000036146us-gaap:AccountingStandardsUpdate202309Member2025-09-300000036146trmk:TroubledDebtRestructuringsMemberus-gaap:CommercialPortfolioSegmentMember2024-07-012024-09-300000036146us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-12-310000036146us-gaap:RealEstateMembertrmk:OtherRealEstateSecuredFinancingReceivableMember2025-01-012025-09-300000036146us-gaap:ConsumerPortfolioSegmentMember2023-12-310000036146us-gaap:SegmentContinuingOperationsMember2025-01-012025-09-300000036146trmk:ResidentialFinancingReceivableMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2025-09-3000000361462024-09-300000036146us-gaap:RealEstateMemberus-gaap:FinancingReceivables60To89DaysPastDueMembertrmk:NonresidentialPropertiesFinancingReceivablesMember2025-09-300000036146us-gaap:FinancialAssetPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-09-300000036146us-gaap:NondesignatedMembertrmk:MortgageServicingRightsHedgeMember2025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2025-09-300000036146us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-04-012025-06-300000036146trmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2025-01-012025-09-300000036146trmk:OtherLoansSecuredByRealEstateMembertrmk:ResidentialFinancingReceivableMemberus-gaap:ConsumerBorrowerMember2025-01-012025-09-300000036146us-gaap:RealEstateMembertrmk:ConstructionLandDevelopmentAndOtherFinancingReceivableMember2024-01-012024-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:NonaccrualMemberus-gaap:ConsumerBorrowerMember2024-12-310000036146us-gaap:FinancialAssetNotPastDueMembertrmk:OtherCommercialLoansAndLeasesFinancingReceivableMember2024-12-310000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMemberus-gaap:FinancingReceivables60To89DaysPastDueMember2024-09-300000036146us-gaap:CommercialBorrowerMembertrmk:OtherConstructionMembertrmk:OtherLoansSecuredByRealEstateMemberus-gaap:SpecialMentionMember2024-12-310000036146trmk:LoansHeldForInvestmentMember2024-01-012024-09-300000036146us-gaap:CommonStockMembertrmk:StockRepurchaseProgramSevenMember2025-01-012025-09-300000036146trmk:OtherResidentialFinancingReceivableMemberus-gaap:FinancingReceivables30To59DaysPastDueMemberus-gaap:RealEstateMembertrmk:TroubledDebtRestructuringsMember2024-09-300000036146us-gaap:RetainedEarningsMember2024-12-310000036146trmk:TrustmarkBankMembertrmk:CapitalToRiskWeightedAssetsMember2025-09-30trmk:Segmentxbrli:pureiso4217:USDxbrli:sharestrmk:KeyRatioxbrli:sharestrmk:CPRtrmk:Regioniso4217:USDtrmk:Contract