XML 20 R70.htm IDEA: XBRL DOCUMENT v2.4.1.9
Acquired Loans Part 3 (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Feb. 15, 2013
Change in accretable difference on acquired loans [Abstract]      
Accretable yield, beginning $ (109,006)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ (26,383)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield  
Additions due to acquisition 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions [1] (98,394)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions [1]  
Accretion to interest income 48,627us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion 40,688us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion  
Disposals 16,383us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans 18,438us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans  
Reclassification to / (from) nonaccretable difference (33,153)trmk_ReclassificationToFromNonAccretableDifference [2] (43,355)trmk_ReclassificationToFromNonAccretableDifference [2]  
Accretable yield, ending (77,149)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield (109,006)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield  
BancTrust Financial Group, Inc. [Member]      
Change in accretable difference on acquired loans [Abstract]      
Accretable yield, beginning     98,394us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= trmk_BanctrustFinancialGroupIncMember
Accretable yield, ending     $ 98,394us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= trmk_BanctrustFinancialGroupIncMember
[1] Accretable yield on loans acquired from BancTrust on February 15, 2013, including measurement period adjustments.
[2] Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cashflows.