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Acquired Loans (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | $ 525,783 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember | $ 769,990 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember
Less allowance for loan losses, acquired loans | 10,541 trmk_AllowanceForLoanLossesAcquiredLoans / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember | 7,249 trmk_AllowanceForLoanLossesAcquiredLoans / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember
Net acquired loans | 515,242 trmk_AcquiredLoansNetOfAllowanceForLosses / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember | 762,741 trmk_AcquiredLoansNetOfAllowanceForLosses / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember
Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 23,626 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember | 34,216 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember
Less allowance for loan losses, acquired loans | 1,518 trmk_AllowanceForLoanLossesAcquiredLoans / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember | 2,387 trmk_AllowanceForLoanLossesAcquiredLoans / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember
Net acquired loans | 22,108 trmk_AcquiredLoansNetOfAllowanceForLosses / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember | 31,829 trmk_AcquiredLoansNetOfAllowanceForLosses / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 58,309 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 98,928 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 1,197 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 2,363 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 116,920 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ResidentialFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 157,914 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ResidentialFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 13,180 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ResidentialFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 16,416 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_ResidentialFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Nonfarm, Nonresidential Properties [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 202,323 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_NonresidentialPropertiesFinancingReceivablesMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 287,136 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_NonresidentialPropertiesFinancingReceivablesMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Nonfarm, Nonresidential Properties [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 7,672 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_NonresidentialPropertiesFinancingReceivablesMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 10,945 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_NonresidentialPropertiesFinancingReceivablesMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 27,813 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_OtherRealEstateSecuredFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 33,948 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_OtherRealEstateSecuredFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 1,096 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_OtherRealEstateSecuredFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember | 2,644 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableBySubClassReceivableAxis = trmk_OtherRealEstateSecuredFinancingReceivableMember / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_RealEstateSecuredFinancingReceivableMember
Commercial And Industrial Loans [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 88,256 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_CommercialAndIndustrialLoansMember | 149,495 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_CommercialAndIndustrialLoansMember
Commercial And Industrial Loans [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 277 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_CommercialAndIndustrialLoansMember | 394 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_CommercialAndIndustrialLoansMember
Consumer Loans Financing Receivable [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 9,772 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_ConsumerLoansFinancingReceivableMember | 18,428 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_ConsumerLoansFinancingReceivableMember
Consumer Loans Financing Receivable [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 0 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_ConsumerLoansFinancingReceivableMember | 119 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_ConsumerLoansFinancingReceivableMember
Other Loans Financing Receivable [Member] | Noncovered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | 22,390 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_OtherLoansFinancingReceivableMember | 24,141 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_NoncoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_OtherLoansFinancingReceivableMember
Other Loans Financing Receivable [Member] | Covered [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | $ 204 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_OtherLoansFinancingReceivableMember | $ 1,335 trmk_AcquiredLoansTotalCarryingValue / trmk_FinancingReceivableByTypeAxis = trmk_CoveredMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = trmk_OtherLoansFinancingReceivableMember

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- Definition The value of acquired loans net of the allowance for loan losses. + References No definition available. + Details
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