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Derivative Financial Instruments, Offsetting Derivative Assets and Liabilities (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Interest Rate Swap [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets | $ 3,025 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 7,431 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Assets | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Net Amounts of Assets presented in the Statement of Financial Position, Offsetting of Derivative Assets | 3,025 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 7,431 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets | (347)trmk_DerivativeAssetsOffSetFinancialInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (967)trmk_DerivativeAssetsOffSetFinancialInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Cash Collateral Received, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets | 0 us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (1,920)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Net Amount, Offsetting of Derivative Assets | 2,678 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 4,544 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Offsetting Derivative Liabilities [Abstract] |  |
Gross Amounts of Recognized Liabilities, Offsetting of Derivative Liabilities | 2,813 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 4,628 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 0 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Net Amounts of Liabilities presented in the Statement of Financial Position, Offsetting of Derivative Liabilities | 2,813 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 4,628 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities | (347)trmk_DerivativeLiabilitiesOffsetFinancialInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (967)trmk_DerivativeLiabilitiesOffsetFinancialInstruments / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Cash Collateral Posted, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities | 0 trmk_DerivativeLiabilityCollateralObligationToReturnCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 0 trmk_DerivativeLiabilityCollateralObligationToReturnCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Net Amount, Offsetting of Derivative Liabilities | $ 2,466 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 3,661 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition Derivative assets off set financial instruments. + References No definition available. + Details
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- Definition Derivative off set financial instruments. + References No definition available. + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative liabilities. + References No definition available. + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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