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Acquired Loans Part 2 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Carrying value of acquired loans [Abstract]    
Accretion to interest income $ 48,627us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion $ 40,688us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
Acquired Impaired [Member] | Noncovered Loans [Member]    
Carrying value of acquired loans [Abstract]    
Net carrying value, beginning 639,656trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 72,942trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Loans acquired   790,335trmk_LoansAcquiredFairValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 [1]
Accretion to interest income 44,575us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 35,538us-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 434,151trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 639,656trmk_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 30,166trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 45,391trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Loans acquired   0trmk_LoansAcquiredFairValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 [1]
Accretion to interest income 4,052us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 5,150us-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 415trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 1,803trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Net carrying value, ending 20,504trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 30,166trmk_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 123,085trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 6,696trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3]
Loans acquired   153,900trmk_LoansAcquiredFairValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1],[3]
Accretion to interest income 1,706us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 2,628us-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 686trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 0trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3]
Net carrying value, ending 81,091trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 123,085trmk_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 1,663trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 2,460trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3]
Loans acquired   0trmk_LoansAcquiredFairValue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1],[3]
Accretion to interest income 1us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 159us-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 454trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 0trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3]
Net carrying value, ending $ 1,604trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] $ 1,663trmk_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.