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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Loss Contingencies [Line Items] |  |  |
Unused commitments to extend credit | $ 2,489,000,000 us-gaap_UnusedCommitmentsToExtendCredit | $ 2,193,000,000 us-gaap_UnusedCommitmentsToExtendCredit |
Lease Commitments [Abstract] |  |  |
Rental expense | 8,500,000 us-gaap_OperatingLeasesRentExpenseNet | 8,400,000 us-gaap_OperatingLeasesRentExpenseNet | 7,400,000 us-gaap_OperatingLeasesRentExpenseNet
Future minimum rental commitments under noncancellable operating leases [Abstract] |  |  |
2015 | 6,010,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
2016 | 4,034,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
2017 | 3,568,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
2018 | 3,140,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
2019 | 2,585,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
Thereafter | 11,960,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |
Total | 31,297,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Standby Letters of Credit [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Maximum potential exposure to credit loss in the event of nonperformance | 132,800,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | 143,200,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember |
Letters of credit, maturity term - maximum | 3 years |  |
Collateral held, fair value | 31,500,000 us-gaap_SecuritiesHeldAsCollateralAtFairValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember |  |
Pending or Threatened Litigation, Stanford Financial Group [Member] |  |  |
Legal Proceedings [Abstract] |  |  |
Lawsuits naming entity as defendant, number | 2 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ThreatenedLitigationMember |  |
Pending or Threatened Litigation, Overdraft Fees [Member] |  |  |
Legal Proceedings [Abstract] |  |  |
Lawsuits naming entity as defendant, number | 2 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LossContingenciesByNatureOfContingencyAxis = trmk_PendingOrThreatenedLitigationOverdraftFeesMember |  |
Litigation settlement amount | 4,000,000 us-gaap_LitigationSettlementExpense / us-gaap_LossContingenciesByNatureOfContingencyAxis = trmk_PendingOrThreatenedLitigationOverdraftFeesMember |  |
Litigation settlement amount, net of taxes | $ 2,500,000 trmk_LitigationSettlementExpenseNetOfTax / us-gaap_LossContingenciesByNatureOfContingencyAxis = trmk_PendingOrThreatenedLitigationOverdraftFeesMember |  |
Potential claims resolved by settlement | 100,000 trmk_PotentialClaimsResolvedBySettlement / us-gaap_LossContingenciesByNatureOfContingencyAxis = trmk_PendingOrThreatenedLitigationOverdraftFeesMember |  |
Number of customers excluded themselves from the class action settlement | 16 trmk_NumberOfCustomersThatExcludedThemselvesFromClassActionSettlement / us-gaap_LossContingenciesByNatureOfContingencyAxis = trmk_PendingOrThreatenedLitigationOverdraftFeesMember |  |

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