XML 27 R73.htm IDEA: XBRL DOCUMENT v2.4.1.9

Acquired Loans Part 6 (Details) (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

$ 3,823trmk_AcquiredLoans30To59DaysPastDue

$ 12,600trmk_AcquiredLoans30To59DaysPastDue

Past Due 60 - 89 Days

2,794trmk_AcquiredLoans60To89DaysPastDue

7,171trmk_AcquiredLoans60To89DaysPastDue

Past Due Greater Than 90 Days

43,412trmk_AcquiredLoansMoreThan90DaysPastDue

^[1]

63,444trmk_AcquiredLoansMoreThan90DaysPastDue

^[1]

Total Past Due

50,029trmk_AcquiredLoansCarryingValueTotalPastDue

83,215trmk_AcquiredLoansCarryingValueTotalPastDue

Nonaccrual

1,144trmk_AcquiredLoansNonaccrualStatus

^[2]

2,353trmk_AcquiredLoansNonaccrualStatus

^[2]

Current Loans

498,236trmk_AcquiredLoansRecordedInvestmentCurrent

718,638trmk_AcquiredLoansRecordedInvestmentCurrent

Acquired loans

549,409trmk_AcquiredLoansCarryingValueLoans

804,206trmk_AcquiredLoansCarryingValueLoans

Noncovered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

3,331trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

11,171trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

Past Due 60 - 89 Days

2,010trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

5,012trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

Past Due Greater Than 90 Days

42,149trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

^[1]

60,308trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

^[1]

Total Past Due

47,490trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

76,491trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

Nonaccrual

1,077trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

^[2]

1,867trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

^[2]

Current Loans

477,216trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

691,632trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

Acquired loans

525,783trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

769,990trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember

Covered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

492trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

1,429trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

Past Due 60 - 89 Days

784trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

2,159trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

Past Due Greater Than 90 Days

1,263trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

^[1]

3,136trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

^[1]

Total Past Due

2,539trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

6,724trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

Nonaccrual

67trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

^[2]

486trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

^[2]

Current Loans

21,020trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

27,006trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

Acquired loans

23,626trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

34,216trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember

Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Noncovered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

246trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

1,648trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

7trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

468trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

21,985trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

31,744trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

22,238trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

33,860trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

194trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

67trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

35,877trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

65,001trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

58,309trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

98,928trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

87trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

376trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

553trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

376trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

640trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

445trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

821trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

1,278trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

1,197trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ConstructionLandDevelopmentAndOtherFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

2,363trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

2,576trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

3,901trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

981trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

1,166trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

5,162trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

7,589trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

8,719trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

12,656trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

422trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

116trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

107,779trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

145,142trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

116,920trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

157,914trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

253trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

515trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

296trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

358trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

477trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

1,142trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

1,026trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

2,015trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

12,154trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

14,401trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

13,180trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_ResidentialFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

16,416trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

89trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

4,851trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

865trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

3,127trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

13,275trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

15,421trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

14,229trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

23,399trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

461trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

188,094trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

263,276trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

202,323trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

287,136trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

239trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

243trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

488trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

1,662trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

0trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

793trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

727trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

2,698trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

6,945trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

8,247trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

7,672trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_NonresidentialPropertiesFinancingReceivablesMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

10,945trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

40trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

604trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

1,922trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

604trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

1,962trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

33trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

27,209trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

31,953trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

27,813trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

33,948trmk_AcquiredLoansCarryingValueLoans
/ 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]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

571trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

139trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Past Due Greater Than 90 Days

368trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

2trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[1]

Total Past Due

368trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

712trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

^[2]

Current Loans

728trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

1,932trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Acquired loans

1,096trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

2,644trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableBySubClassReceivableAxis
= trmk_OtherRealEstateSecuredFinancingReceivableMember
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_RealEstateSecuredFinancingReceivableMember

Commercial And Industrial Loans Financing Receivable [Member] | Noncovered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

334trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

526trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Past Due 60 - 89 Days

128trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

217trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Past Due Greater Than 90 Days

1,099trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[1]

3,387trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[1]

Total Past Due

1,561trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

4,130trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Nonaccrual

461trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[2]

1,170trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[2]

Current Loans

86,234trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

144,195trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Acquired loans

88,256trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

149,495trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Commercial And Industrial Loans Financing Receivable [Member] | Covered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

13trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Past Due Greater Than 90 Days

42trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[1]

0trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[1]

Total Past Due

42trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

13trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Nonaccrual

67trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[2]

41trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

^[2]

Current Loans

168trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

340trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Acquired loans

277trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

394trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_CommercialAndIndustrialLoansFinancingReceivableMember

Consumer Loans Financing Receivable [Member] | Noncovered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

86trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

205trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Past Due 60 - 89 Days

29trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

34trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Past Due Greater Than 90 Days

24trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[1]

92trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[1]

Total Past Due

139trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

331trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[2]

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[2]

Current Loans

9,633trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

18,097trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Acquired loans

9,772trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

18,428trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Consumer Loans Financing Receivable [Member] | Covered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Past Due Greater Than 90 Days

0trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[1]

0trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[1]

Total Past Due

0trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

0trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[2]

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

^[2]

Current Loans

0trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

119trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Acquired loans

0trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

119trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_ConsumerLoansFinancingReceivableMember

Other Loans Financing Receivable [Member] | Noncovered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Past Due Greater Than 90 Days

0trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[1]

153trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[1]

Total Past Due

0trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

153trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[2]

20trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[2]

Current Loans

22,390trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

23,968trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Acquired loans

22,390trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

24,141trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_NoncoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Other Loans Financing Receivable [Member] | Covered [Member]

Acquired Loans, Aging [Abstract]

Past Due 30 - 59 Days

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

0trmk_AcquiredLoans30To59DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Past Due 60 - 89 Days

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

0trmk_AcquiredLoans60To89DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Past Due Greater Than 90 Days

0trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[1]

646trmk_AcquiredLoansMoreThan90DaysPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[1]

Total Past Due

0trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

646trmk_AcquiredLoansCarryingValueTotalPastDue
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Nonaccrual

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[2]

0trmk_AcquiredLoansNonaccrualStatus
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

^[2]

Current Loans

204trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

689trmk_AcquiredLoansRecordedInvestmentCurrent
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

Acquired loans

$ 204trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

$ 1,335trmk_AcquiredLoansCarryingValueLoans
/ trmk_FinancingReceivableByTypeAxis
= trmk_CoveredMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= trmk_OtherLoansFinancingReceivableMember

[1]	Past due 90 days or more but still accruing interest.
[2]	Acquired loans not accounted for under FASB ASC Topic 310-30.

X

- Definition

Acquired loans that are less than 60 days past due but more than 29 days past due.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoans30To59DaysPastDue
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Acquired loans that are less than 90 days past due but more than 59 days past due.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoans60To89DaysPastDue
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	trmk_AcquiredLoansAgingAbstract
Namespace Prefix:	trmk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying value of acquired loans during the period.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoansCarryingValueLoans
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying value of acquired loans considered as past due.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoansCarryingValueTotalPastDue
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Acquired loans more than 90 days past due.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoansMoreThan90DaysPastDue
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Acquired loans that are on nonaccrual status as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoansNonaccrualStatus
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Acquired loans that are current.

+ References

No definition available.

+ Details

Name:	trmk_AcquiredLoansRecordedInvestmentCurrent
Namespace Prefix:	trmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	trmk_FinancingReceivableByTypeAxis=trmk_CoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	trmk_FinancingReceivableByTypeAxis=trmk_NoncoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_CommercialAndIndustrialLoansFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_ConsumerLoansFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_OtherLoansFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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