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Acquired Loans Part 1 (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Carrying value of acquired loans [Abstract]      
Accretion to interest income $ 10,197us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion $ 12,709us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion  
Acquired Impaired [Member] | Covered Loans [Member]      
Carrying value of acquired loans [Abstract]      
Net carrying value, beginning 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		 30,166trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Accretion to interest income 745us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   4,052us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Payments received, net (4,097)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   (12,396)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Other 1trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 [1]   (1,733)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 [1]
Less change in allowance for loan losses, acquired loans 787trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   415trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Net carrying value, ending 17,940trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   20,504trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Acquired Impaired [Member] | Noncovered Loans [Member]      
Carrying value of acquired loans [Abstract]      
Net carrying value, beginning 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		 639,656trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Accretion to interest income 9,452us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   44,575us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Payments received, net (53,314)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   (216,378)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Other 156trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 [1]   (29,724)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 [1]
Less change in allowance for loan losses, acquired loans (565)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   (3,978)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Net carrying value, ending 389,880trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   434,151trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Acquired Not ASC 310-30 [Member] | Covered Loans [Member]      
Carrying value of acquired loans [Abstract]      
Net carrying value, beginning 1,604trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2] 1,663trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2] 1,663trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Accretion to interest income (1)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   1us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Payments received, net (3)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   (30)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Other 0trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1],[2]   (484)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1],[2]
Less change in allowance for loan losses, acquired loans 0trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   454trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Net carrying value, ending 1,600trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   1,604trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Acquired Not ASC 310-30 [Member] | Noncovered Loans [Member]      
Carrying value of acquired loans [Abstract]      
Net carrying value, beginning 81,091trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2] 123,085trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2] 123,085trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Accretion to interest income 270us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   1,706us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Payments received, net (4,175)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   (42,284)trmk_ChangeInCarryingAmountOfLoansPaymentsReceivedNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Other 0trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1],[2]   (2,102)trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesChangesInExpectedCashFlowsThatDoNotAffectNonaccretableDifference
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1],[2]
Less change in allowance for loan losses, acquired loans 0trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   686trmk_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldOther
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Net carrying value, ending $ 77,186trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]   $ 81,091trmk_AcquiredLoansNetOfAllowanceForLosses
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= trmk_NoncoveredLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
[1] Includes acquired loan terminations through foreclosure, charge-off, pool recovery and other terminations.
[2] "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, "Loans and Debt Securities Acquired with Deteriorated Credit Quality."