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Derivative Financial Instruments Part 1 (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet obligations |  | $ 155,800,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Valuation adjustment |  | 1,900,000 trmk_NegativeValuationAdjustment / us-gaap_FinancialInstrumentAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Notional amount of mirror-image derivative contracts | 60,000,000 invest_DerivativeNotionalAmount / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Derivative inception date | Dec. 31, 2014 |
Derivative maturity date | Dec. 31, 2019 |
Description of variable rate basis for derivative | three-month LIBOR |
Swap fixed interest rate to be paid (in hundredths) | 1.66%us-gaap_DerivativeFixedInterestRate / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Period for which cash flow hedges will be used to hedge quarterly interest payments | 5 years |
Amount of ineffective derivative | 0 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Estimated amount to be reclassified as an increase to interest expense during the next twelve months | 747,000 us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Accumulated net, after tax gain included in other comprehensive loss | 136,000 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 1,500,000 us-gaap_DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivatives not Designated as Hedging Instruments [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet obligations | 142,000,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Valuation adjustment | (1,000,000)trmk_NegativeValuationAdjustment / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Net positive ineffectiveness on MSR fair value | 3,100,000 trmk_NetPositiveIneffectivenessOnMsrFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 3,700,000 trmk_NetPositiveIneffectivenessOnMsrFairValue / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivatives not Designated as Hedging Instruments [Member] | Beneficiary [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Number of risk participation agreements | 3 trmk_NumberOfRiskParticipationAgreements / us-gaap_GuaranteeObligationsByNatureAxis = trmk_BeneficiaryMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 3 trmk_NumberOfRiskParticipationAgreements / us-gaap_GuaranteeObligationsByNatureAxis = trmk_BeneficiaryMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Aggregate notional amount of credit risk participation agreements | 19,100,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_GuaranteeObligationsByNatureAxis = trmk_BeneficiaryMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 19,700,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_GuaranteeObligationsByNatureAxis = trmk_BeneficiaryMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Number of risk participation agreements | 1 trmk_NumberOfRiskParticipationAgreements / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Aggregate notional amount of credit risk participation agreements | 6,200,000 us-gaap_DerivativeAssetNotionalAmount / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeAssetNotionalAmount / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Off-balance sheet obligations | 88,400,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 58,500,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Positive valuation adjustment | 1,300,000 trmk_PositiveValuationAdjustment / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 126,000 trmk_PositiveValuationAdjustment / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateLockCommitmentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Notional amount of mirror-image derivative contracts | 349,400,000 invest_DerivativeNotionalAmount / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 355,900,000 invest_DerivativeNotionalAmount / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Termination value of derivatives | 1,900,000 trmk_TerminationValueOfDerivatives / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 508,000 trmk_TerminationValueOfDerivatives / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Market value of posted collateral | $ 1,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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X
- Definition Amount of negative valuation adjustment on fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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- Definition Amount of net positive ineffectiveness from comparing the total hedge cost to the changes in fair value of Mortgage Servicing Rights derivative assets attributable to interest rate changes. + References No definition available. + Details
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- Definition The number of risk participation agreements the entity has entered into. + References No definition available. + Details
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- Definition Amount of positive valuation adjustment on fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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X
- Definition Termination value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to a provision from agreements with each of its derivative counterparties stating that the entity will be considered on default on its derivative obligations if the entity defaulted on payment of indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender. + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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