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Other Real Estate and Covered Other Real Estate (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Market
Dec. 31, 2013
Dec. 31, 2012
Feb. 15, 2013
Mar. 16, 2012
Other real estate, excluding covered other real estate [Rollforward]          
Balance at beginning of period $ 106,539,000us-gaap_OtherRealEstateAndForeclosedAssets $ 78,189,000us-gaap_OtherRealEstateAndForeclosedAssets $ 79,053,000us-gaap_OtherRealEstateAndForeclosedAssets    
Additions 37,428,000us-gaap_RealEstateOtherAdditions [1] 80,256,000us-gaap_RealEstateOtherAdditions [1] 38,894,000us-gaap_RealEstateOtherAdditions [1]    
Disposals (43,802,000)us-gaap_RealEstateOtherDeductions (45,545,000)us-gaap_RealEstateOtherDeductions (33,155,000)us-gaap_RealEstateOtherDeductions    
Write-downs (7,656,000)trmk_WritedownsOnNonCoveredOtherAssets (6,361,000)trmk_WritedownsOnNonCoveredOtherAssets (6,603,000)trmk_WritedownsOnNonCoveredOtherAssets    
Balance at end of period 92,509,000us-gaap_OtherRealEstateAndForeclosedAssets 106,539,000us-gaap_OtherRealEstateAndForeclosedAssets 78,189,000us-gaap_OtherRealEstateAndForeclosedAssets    
Gain (loss), net on the sale of other real estate included in ORE/Foreclosure expense 3,697,000us-gaap_GainsLossesOnSalesOfInvestmentRealEstate (881,000)us-gaap_GainsLossesOnSalesOfInvestmentRealEstate (279,000)us-gaap_GainsLossesOnSalesOfInvestmentRealEstate    
Other real estate, excluding covered other real estate [Line Items]          
Total other real estate, excluding covered other real estate 92,509,000us-gaap_OtherRealEstateAndForeclosedAssets 106,539,000us-gaap_OtherRealEstateAndForeclosedAssets 78,189,000us-gaap_OtherRealEstateAndForeclosedAssets    
Covered other real estate, beginning of period 5,108,000trmk_TotalCoveredOtherRealEstate 5,741,000trmk_TotalCoveredOtherRealEstate 6,331,000trmk_TotalCoveredOtherRealEstate    
Transfers from covered loans 2,851,000trmk_TransfersFromCoveredLoans 1,934,000trmk_TransfersFromCoveredLoans 1,424,000trmk_TransfersFromCoveredLoans    
FASB ASC 310-30 adjustment for the residual recorded investment 136,000trmk_IncreaseDecreaseCoveredOtherRealEstateAdjustments (345,000)trmk_IncreaseDecreaseCoveredOtherRealEstateAdjustments (112,000)trmk_IncreaseDecreaseCoveredOtherRealEstateAdjustments    
Net transfers from covered loans 2,987,000trmk_NetTransfersFromCoveredLoans 1,589,000trmk_NetTransfersFromCoveredLoans 1,312,000trmk_NetTransfersFromCoveredLoans    
Disposals (1,232,000)trmk_Disposals (1,442,000)trmk_Disposals (1,631,000)trmk_Disposals    
Write-downs (803,000)trmk_WritedownsOnCoveredOtherAssets (780,000)trmk_WritedownsOnCoveredOtherAssets (271,000)trmk_WritedownsOnCoveredOtherAssets    
Covered other real estate, end of period 6,060,000trmk_TotalCoveredOtherRealEstate 5,108,000trmk_TotalCoveredOtherRealEstate 5,741,000trmk_TotalCoveredOtherRealEstate    
Gain, net on the sale of covered other real estate included in ORE/Foreclosure expenses 24,000trmk_GainLossNetOnSaleOfCoveredOtherRealEstateIncludedInOreforeclosureExpenses 119,000trmk_GainLossNetOnSaleOfCoveredOtherRealEstateIncludedInOreforeclosureExpenses 485,000trmk_GainLossNetOnSaleOfCoveredOtherRealEstateIncludedInOreforeclosureExpenses    
Business Acquisition [Line Items]          
Key market regions 5trmk_NumberOfKeyMarketRegion        
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]          
Total covered other real estate 6,060,000trmk_TotalCoveredOtherRealEstate 5,108,000trmk_TotalCoveredOtherRealEstate 5,741,000trmk_TotalCoveredOtherRealEstate    
Construction Land Development And Other Land Properties [Member]          
Other real estate, excluding covered other real estate [Line Items]          
Covered other real estate, end of period 1,917,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember		 733,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember		      
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]          
Total covered other real estate 1,917,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember		 733,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember		      
1-4 Family Residential Properties [Member]          
Other real estate, excluding covered other real estate [Line Items]          
Covered other real estate, end of period 1,103,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember		 1,981,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember		      
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]          
Total covered other real estate 1,103,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember		 1,981,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember		      
Nonfarm, Nonresidential Properties [Member]          
Other real estate, excluding covered other real estate [Line Items]          
Covered other real estate, end of period 2,296,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember		 2,394,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember		      
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]          
Total covered other real estate 2,296,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember		 2,394,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember		      
Other Real Estate Properties [Member]          
Other real estate, excluding covered other real estate [Line Items]          
Covered other real estate, end of period 744,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember		 0trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember		      
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]          
Total covered other real estate 744,000trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember		 0trmk_TotalCoveredOtherRealEstate
/ trmk_CoveredFinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember		      
BancTrust Financial Group, Inc. [Member]          
Business Acquisition [Line Items]          
Business acquisition, covered other real estate acquired       40,100,000trmk_BusinessAcquisitionCoveredOtherRealEstateAcquired
/ us-gaap_BusinessAcquisitionAxis
= trmk_BanctrustFinancialGroupIncMember		  
Bay Bank and Trust Company [Member]          
Business Acquisition [Line Items]          
Business acquisition, covered other real estate acquired         2,600,000trmk_BusinessAcquisitionCoveredOtherRealEstateAcquired
/ us-gaap_BusinessAcquisitionAxis
= trmk_BayBankAndTrustCompanyMember
Construction, Land Development And Other Land Properties [Member]          
Other real estate, excluding covered other real estate [Rollforward]          
Balance at end of period 61,015,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_ConstructionLandDevelopmentAndOtherLandLoansMember		 65,273,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_ConstructionLandDevelopmentAndOtherLandLoansMember		      
Other real estate, excluding covered other real estate [Line Items]          
Total other real estate, excluding covered other real estate 61,015,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_ConstructionLandDevelopmentAndOtherLandLoansMember		 65,273,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_ConstructionLandDevelopmentAndOtherLandLoansMember		      
1 - 4 Family Residential Properties [Member]          
Other real estate, excluding covered other real estate [Rollforward]          
Balance at end of period 10,150,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_FamilyResidentialPropertiesMember		 14,696,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_FamilyResidentialPropertiesMember		      
Other real estate, excluding covered other real estate [Line Items]          
Total other real estate, excluding covered other real estate 10,150,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_FamilyResidentialPropertiesMember		 14,696,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_FamilyResidentialPropertiesMember		      
Nonfarm, Nonresidential Properties [Member]          
Other real estate, excluding covered other real estate [Rollforward]          
Balance at end of period 19,696,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_NonfarmNonresidentialPropertiesMember		 26,433,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_NonfarmNonresidentialPropertiesMember		      
Other real estate, excluding covered other real estate [Line Items]          
Total other real estate, excluding covered other real estate 19,696,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_NonfarmNonresidentialPropertiesMember		 26,433,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_NonfarmNonresidentialPropertiesMember		      
Other Real Estate Properties [Member]          
Other real estate, excluding covered other real estate [Rollforward]          
Balance at end of period 1,648,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_OtherRealEstatePropertiesMember		 137,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_OtherRealEstatePropertiesMember		      
Other real estate, excluding covered other real estate [Line Items]          
Total other real estate, excluding covered other real estate $ 1,648,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_OtherRealEstatePropertiesMember		 $ 137,000us-gaap_OtherRealEstateAndForeclosedAssets
/ trmk_OtherRealEstatePropertyTypeAxis
= trmk_OtherRealEstatePropertiesMember		      
[1] Includes $40.1 million of other real estate acquired from BancTrust on February 15, 2013, and $2.6 million of other real estate acquired from Bay Bank on March 16, 2012.