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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Comprehensive Income [Abstract]      
Net income per consolidated statements of income $ 123,562us-gaap_NetIncomeLoss $ 117,060us-gaap_NetIncomeLoss $ 117,283us-gaap_NetIncomeLoss
Unrealized gains (losses) on available for sale securities and transferred securities:      
Unrealized holding gains (losses) arising during the period 10,933us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (41,456)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 60us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: adjustment for net gains realized in net income (185)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (299)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (654)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Change in net unrealized holding losses on securities transferred to held to maturity 3,711us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax (28,642)us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax
Pension and other postretirement benefit plans:      
Net change in prior service costs 154us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax 155us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax 32us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax
Recognized net loss due to BancTrust termination 837trmk_OtherComprehensiveIncomeLossFinalizationOfPensionAndOtherPostretirementBenefitPlanSettlementNetOfTax 0trmk_OtherComprehensiveIncomeLossFinalizationOfPensionAndOtherPostretirementBenefitPlanSettlementNetOfTax 0trmk_OtherComprehensiveIncomeLossFinalizationOfPensionAndOtherPostretirementBenefitPlanSettlementNetOfTax
Recognized net loss due to lump sum settlements 559us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax 1,374us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax
Recognized net actuarial (loss) gain (13,374)us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease 20,218us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease 836us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease
Derivatives:      
Change in the accumulated gain on effective cash flow hedge derivatives (1,387)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 1,524us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Less: adjustment for loss realized in net income (1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other comprehensive income (loss), net of tax 1,247us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (47,126)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 274us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 124,809us-gaap_ComprehensiveIncomeNetOfTax $ 69,934us-gaap_ComprehensiveIncomeNetOfTax $ 117,557us-gaap_ComprehensiveIncomeNetOfTax