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v2.4.1.9

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

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