XML 94 R79.htm IDEA: XBRL DOCUMENT
v3.25.4

LHFI and ACL, LHFI - Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers (Details) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | 1 -4 Family Residential Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers | [1] | BBB 7-10 US CBI (1), National Unemployment | BBB 7-10 US CBI (1), National Unemployment
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Lots and Development [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National HPI, National Unemployment | National HPI, National Unemployment
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Unimproved Land [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National HPI, National Unemployment | National HPI, National Unemployment
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | All Other Consumer [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National HPI, National Unemployment | National HPI, National Unemployment
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | All Other Consumer [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National HPI, National Unemployment | National HPI, National Unemployment
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Consumer 1-4 Family - 1st Liens [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers | [2] | National HPI, Southern Unemployment (2) | National HPI, Southern Unemployment (2)
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Nonresidential Owner- Occupied [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Southern Unemployment, National CRE Price Index | Southern Unemployment, National CRE Price Index
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonresidential Owner- Occupied [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Southern Unemployment, National CRE Price Index | Southern Unemployment, National CRE Price Index
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied - Hotel/Motel [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied - Office [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied- Retail [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied- Senior Living/ Nursing Homes [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-occupied - All Other [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Nonresidential Owner- Occupied [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Southern Unemployment, National CRE Price Index | Southern Unemployment, National CRE Price Index
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Nonowner-occupied - All Other [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Nonresidential Nonowner- Occupied - Apartments [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, Southern Unemployment | National CRE Price Index, Southern Unemployment
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Commercial and Industrial - Non-Working Capital [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Trustmark historical data | Trustmark historical data
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Commercial and Industrial - Working Capital [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Trustmark historical data | Trustmark historical data
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Equipment Finance Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | WARM | WARM
Loss Drivers |  | Southern Unemployment, National GDP | Southern Unemployment, National GDP
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Credit Cards [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | WARM | WARM
Loss Drivers |  | Trustmark call report data | Trustmark call report data
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Other Construction [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National CRE Price Index, National Unemployment, BBB 7-10 US CBI | National CRE Price Index, National Unemployment, BBB 7-10 US CBI
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Trustmark Mortgage [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | WARM | WARM
Loss Drivers |  | Southern Unemployment | Southern Unemployment
Consumer Loans [Member] | Consumer Loans [Member] | All Other Consumer [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | National HPI, National Unemployment | National HPI, National Unemployment
Consumer Loans [Member] | Consumer Loans [Member] | Credit Cards [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | WARM | WARM
Loss Drivers |  | Trustmark call report data | Trustmark call report data
Consumer Loans [Member] | Consumer Loans [Member] | Overdrafts [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | Loss Rate | Loss Rate
Loss Drivers |  | Trustmark historical data | Trustmark historical data
State and Other Political Subdivision Loans [Member] | State and Other Political Subdivision Loans [Member] | Obligations of State and Political Subdivisions [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Moody's Bond Default Study | Moody's Bond Default Study
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Commercial and Industrial - Non-Working Capital [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Trustmark historical data | Trustmark historical data
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Commercial and Industrial - Working Capital [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | Trustmark historical data | Trustmark historical data
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Equipment Finance Leases [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | WARM | WARM
Loss Drivers |  | Southern Unemployment, National GDP | Southern Unemployment, National GDP
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Other Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Methodology |  | DCF | DCF
Loss Drivers |  | BBB 7-10 US CBI, Southern Unemployment | BBB 7-10 US CBI, Southern Unemployment
[1] | (1) Loss driver was National HPI at December 31, 2024.
[2] | (2) Loss driver was National Unemployment at December 31, 2024.

X
- Definition Allowance for credit loss macroeconomic variables. + References No definition available. + Details
Name: | trmk_AllowanceForCreditLossMacroeconomicVariables
Namespace Prefix: | trmk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Quantitative portion of allowance for credit losses for loan pools estimation methodology. + References No definition available. + Details
Name: | trmk_QuantitativePortionOfAllowanceForCreditLossesForLoanPoolsEstimationMethodology
Namespace Prefix: | trmk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-15 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-15 Reference 12: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 13: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 14: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 15: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 16: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 17: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 18: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-12 Reference 19: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-15 Reference 20: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-15 Reference 21: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-15 Reference 22: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 29 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-29 Reference 23: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_FamilyResidentialConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_LotsAndDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_UnimprovedLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_AllOtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_OtherResidentialFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_ConsumerFamilyFirstLiensMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonresidentialOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_SecuredByNonfarmNonresidentialPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonownerOccupiedHotelMotelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonownerOccupiedOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonOwnerOccupiedRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonownerOccupiedSeniorLivingNursingHomesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonownerOccupiedAllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_OtherRealEstateSecuredFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_NonresidentialNonownerOccupiedApartmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_CommercialAndIndustrialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_CommercialAndIndustrialNonWorkingCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_CommercialAndIndustrialWorkingCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_EquipmentFinanceLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_CreditCardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=trmk_OtherLoansSecuredByRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_OtherConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_OtherConstructionLoanPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_ResidentialFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_TrustmarkMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_ConsumerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_OverdraftsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=trmk_StateAndOtherPoliticalSubdivisionLoansFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_StateAndOtherPoliticalSubdivisionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_ObligationsOfStateAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=trmk_OtherCommercialLoansAndLeasesFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=trmk_OtherCommercialLoansAndLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_EquipmentFinanceLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=trmk_OtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |