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Acquired Loans Part 2 (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Carrying value of acquired loans [Abstract] |  |  |  |
Accretion to interest income | $ 48,627 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion |  | $ 40,688 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion |
Acquired Impaired [Member] | Noncovered Loans [Member] |  |  |  |
Carrying value of acquired loans [Abstract] |  |  |  |
Net carrying value, beginning | 639,656 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 72,942 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Loans acquired |  |  | 790,335 trmk_LoansAcquiredFairValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember | [1]
Accretion to interest income | 44,575 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 35,538 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Payments received, net | (216,378)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | (229,618)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Other | (29,724)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember | [2] | (24,177)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember | [2]
Less allowance for loan losses, acquired loans | (3,978)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | (5,364)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Net carrying value, ending | 434,151 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 639,656 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Acquired Impaired [Member] | Covered Loans [Member] |  |  |  |
Carrying value of acquired loans [Abstract] |  |  |  |
Net carrying value, beginning | 30,166 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 45,391 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Loans acquired |  |  | 0 trmk_LoansAcquiredFairValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember | [1]
Accretion to interest income | 4,052 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 5,150 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Payments received, net | (12,396)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | (18,976)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Other | (1,733)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember | [2] | (3,202)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember | [2]
Less allowance for loan losses, acquired loans | 415 trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 1,803 trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Net carrying value, ending | 20,504 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |  | 30,166 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_UnlikelyToBeCollectedFinancingReceivableMember |
Acquired Not ASC 310-30 [Member] | Noncovered Loans [Member] |  |  |  |
Carrying value of acquired loans [Abstract] |  |  |  |
Net carrying value, beginning | 123,085 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 6,696 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Loans acquired |  |  | 153,900 trmk_LoansAcquiredFairValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [1],[3]
Accretion to interest income | 1,706 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 2,628 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Payments received, net | (42,284)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | (39,281)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Other | (2,102)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [2],[3] | (858)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [2],[3]
Less allowance for loan losses, acquired loans | 686 trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 0 trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Net carrying value, ending | 81,091 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 123,085 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = trmk_NoncoveredLoansMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Acquired Not ASC 310-30 [Member] | Covered Loans [Member] |  |  |  |
Carrying value of acquired loans [Abstract] |  |  |  |
Net carrying value, beginning | 1,663 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 2,460 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Loans acquired |  |  | 0 trmk_LoansAcquiredFairValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [1],[3]
Accretion to interest income | 1 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 159 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Payments received, net | (30)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | (819)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Other | (484)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [2],[3] | (137)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [2],[3]
Less allowance for loan losses, acquired loans | 454 trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | 0 trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
Net carrying value, ending | $ 1,604 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3] | $ 1,663 trmk_AcquiredLoansNetOfAllowanceForLosses / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | [3]
[1] | Adjusted fair value of loans acquired from BancTrust on February 15, 2013.
[2] | Includes acquired loan terminations through foreclosure, charge-off, pool recovery and other terminations.
[3] | "Acquired Not ASC 310-30" loans consist of revolving credit agreements and commercial leases that are not in scope for FASB ASC Topic 310-30.

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- Definition The value of acquired loans net of the allowance for loan losses. + References No definition available. + Details
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- Definition The increases or decreases in the aggregate excess of a loan's other changes over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Represents changes in interest cash flows for loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable, due to the impact of modifications incorporated into the quarterly assessment of expected future cash flows and/or changes in interest rates on variable rate loans. + References No definition available. + Details
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- Definition Total fair value of loans acquired, including covered and non covered. + References No definition available. + Details
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- Definition Amount of decrease from accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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