XML 60 R53.htm IDEA: XBRL DOCUMENT v2.4.1.9
Significant Accounting Policies (Details) (USD $)
Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Factor
Region
Office
Dec. 31, 2013
Dec. 31, 2012
Business [Abstract]      
Number of offices 205trmk_NumberOfOffices    
Loans Held-for-sale [Abstract]      
Percentage of remaining principal balance of the loan servicer may repurchase (in hundredths) 100.00%trmk_PercentageOfRemainingPrincipalBalanceOfLoanServicerMayRepurchase    
Loans Held for Sale [Abstract]      
Number of days loan is contractually past due to be classified as a past due loan 30 days    
Balance of commercial nonaccrual loans identified for impairment analysis, minimum $ 500,000trmk_BalanceOfCommercialLoansIdentifiedForImpairmentAnalysis    
Allowance for loan losses [Abstract]      
Methodology elements in allowance for loan losses guidance 3trmk_NumberOfElementsAllowanceForLoanLossesConsists    
Key market regions 5trmk_KeyMarketRegionsInQualitativeReserveAllocation    
Goodwill and Identifiable Intangible Assets [Abstract]      
Finite-lived intangible assets, average useful life 20 years    
Federal Home Loan Bank and Federal Reserve stock      
Securities with limited marketability 44,100,000trmk_SecuritiesWithLimitedMarketability 28,400,000trmk_SecuritiesWithLimitedMarketability  
Statement of cash flows specific transaction amounts [Abstract]      
Income taxes paid 13,710,000us-gaap_IncomeTaxesPaid 14,520,000us-gaap_IncomeTaxesPaid 57,834,000us-gaap_IncomeTaxesPaid
Interest expense paid on deposits and borrowings 22,268,000us-gaap_InterestPaid 25,715,000us-gaap_InterestPaid 31,496,000us-gaap_InterestPaid
Noncash transfers from loans to foreclosed properties 39,778,000trmk_NoncashTransfersFromLoansToForeclosedProperties [1] 41,042,000trmk_NoncashTransfersFromLoansToForeclosedProperties [1] 37,635,000trmk_NoncashTransfersFromLoansToForeclosedProperties [1]
Transfer of long-term FHLB advances to short-term 6,644,000trmk_TransferOfLongTermFhlbAdvanceToShortTerm 0trmk_TransferOfLongTermFhlbAdvanceToShortTerm 0trmk_TransferOfLongTermFhlbAdvanceToShortTerm
Assets acquired in business combination 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets 1,845,543,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets 234,960,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Liabilities assumed in business combination 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities 1,821,066,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities 209,322,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Statement [Line Items]      
Net cash provided by operating activities 211,267,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 301,183,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 112,277,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash provided by (used in) investing activities (556,255,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (258,967,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 173,739,000us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net cash provided by (used in) financing activities 315,200,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 72,056,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (257,152,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
(Decrease) increase in cash and cash equivalents (29,788,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 114,272,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 28,864,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 345,761,000us-gaap_CashAndCashEquivalentsAtCarryingValue 231,489,000us-gaap_CashAndCashEquivalentsAtCarryingValue 202,625,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 315,973,000us-gaap_CashAndCashEquivalentsAtCarryingValue 345,761,000us-gaap_CashAndCashEquivalentsAtCarryingValue 231,489,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Weighted-average shares used to calculate basic and diluted EPS [Abstract]      
Basic shares (in shares) 67,434us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 66,897us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 64,659us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive shares (in shares) 160us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 176us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 192us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted shares (in shares) 67,594us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 67,073us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 64,851us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Weighted-average antidilutive stock awards (in shares) 32us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 333us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 653us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Variable interest rate, description three-month LIBOR    
Period for which cash flow hedges will be used to hedge quarterly interest payments 5 years    
As Reported [Member]      
Statement [Line Items]      
Net cash provided by operating activities   155,417,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 92,125,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by (used in) investing activities   (113,201,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 193,891,000us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by (used in) financing activities   72,056,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 (257,152,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
(Decrease) increase in cash and cash equivalents   114,272,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 28,864,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at beginning of year   231,489,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 202,625,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Cash and cash equivalents at end of year   345,761,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember		 231,489,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Adjustment [Member]      
Statement [Line Items]      
Net cash provided by operating activities   145,766,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 20,152,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Net cash provided by (used in) investing activities   (145,766,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 (20,152,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Net cash provided by (used in) financing activities   0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 0us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
(Decrease) increase in cash and cash equivalents   0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Cash and cash equivalents at beginning of year   0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Cash and cash equivalents at end of year   $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember		 $ 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
Maximum [Member]      
Loans Held for Sale [Abstract]      
Number of days mortgage LHFS are retained on Trustmark's balance sheet 45 days    
Maximum [Member] | Buildings [Member]      
Premises and Equipment, Net [Abstract]      
Estimated useful lives of the assets 39 years    
Maximum [Member] | Furniture and Equipment [Member]      
Premises and Equipment, Net [Abstract]      
Estimated useful lives of the assets 10 years    
Minimum [Member]      
Loans Held for Sale [Abstract]      
Number of days mortgage LHFS are retained on Trustmark's balance sheet 30 days    
Minimum [Member] | Furniture and Equipment [Member]      
Premises and Equipment, Net [Abstract]      
Estimated useful lives of the assets 3 years    
Commercial Credits [Member]      
Loans Held for Investment [Abstract]      
Number of days past due on credits for loan to be classified as nonaccrual 90 days    
Non-Business Purpose Credits [Member]      
Loans Held for Investment [Abstract]      
Number of days past due on credits for loan to be classified as nonaccrual 120 days    
Consumer Loans [Member]      
Loans Held for Investment [Abstract]      
Number of days past due loans are generally charged-off 180 days    
Non-real Estate Consumer Purpose Loans [Member]      
Loans Held for Investment [Abstract]      
Number of days past due loans are generally charged-off 120 days    
Credit Card Loans [Member]      
Loans Held for Investment [Abstract]      
Number of days past due loans are generally charged-off 180 days    
[1] Includes transfers from covered loans to foreclosed properties.