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Acquired Loans Part 2 (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Change in accretable difference on acquired loans [Abstract]    
Accretable yield at beginning of period $ (77,149)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ (109,006)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
Accretion to interest income 10,197us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion 12,709us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion
Disposals 3,103us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans 2,883us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans
Reclassification to / (from) nonaccretable difference (6,179)trmk_ReclassificationToFromNonAccretableDifference [1] (11,904)trmk_ReclassificationToFromNonAccretableDifference [1]
Accretable yield at end of period $ (70,028)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ (105,318)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
[1] Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.