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FDIC Indemnification Asset (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 15, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
FDIC Indemnification Asset [Abstract] |  |  |  |
FDIC loss-share agreement covered loans and other real estate losses (in hundredths) | 80.00%trmk_PercentageOfCoveredLoanAndOtherRealEstateLossesIncurredInHundredths |  |  |
FDIC True-up provisions |  | $ 2,100,000 trmk_ProvisionForFdicTrueUp | $ 1,700,000 trmk_ProvisionForFdicTrueUp |
Reduction of FDIC indemnification asset included in other noninterest income |  | 800,000 trmk_ReductionInFdicIndemnificationAssetIncludedInOtherNoninterestIncome | 3,400,000 trmk_ReductionInFdicIndemnificationAssetIncludedInOtherNoninterestIncome | 3,700,000 trmk_ReductionInFdicIndemnificationAssetIncludedInOtherNoninterestIncome
Balance, beginning of period |  | 14,347,000 trmk_FdicIndemnificationAssets | 21,774,000 trmk_FdicIndemnificationAssets | 28,348,000 trmk_FdicIndemnificationAssets
(Amortization) Accretion |  | (2,074,000)trmk_IncreaseDecreaseInOtherReceivablesAccretionIndemnificationAsset | (2,469,000)trmk_IncreaseDecreaseInOtherReceivablesAccretionIndemnificationAsset | 245,000 trmk_IncreaseDecreaseInOtherReceivablesAccretionIndemnificationAsset
Transfers to FDIC claims |  | (4,443,000)trmk_TransfersToFdicClaimsReceivable | (851,000)trmk_TransfersToFdicClaimsReceivable | (2,544,000)trmk_TransfersToFdicClaimsReceivable
Change in expected cash flows |  | (517,000)trmk_IncreaseDecreaseInExpectedCashFlowsFdicIndemnificationAsset | (3,472,000)trmk_IncreaseDecreaseInExpectedCashFlowsFdicIndemnificationAsset | (3,761,000)trmk_IncreaseDecreaseInExpectedCashFlowsFdicIndemnificationAsset
Change in FDIC true-up provision |  | (316,000)trmk_ChangeInFdicTrueUpProvision | (635,000)trmk_ChangeInFdicTrueUpProvision | (514,000)trmk_ChangeInFdicTrueUpProvision
Balance, end of period |  | $ 6,997,000 trmk_FdicIndemnificationAssets | $ 14,347,000 trmk_FdicIndemnificationAssets | $ 21,774,000 trmk_FdicIndemnificationAssets

X
- Definition Increase (Decrease) in the carrying amount as of the balance sheet date of receivable assets originating from the indemnification agreement with FDIC to partially cover losses on certain loans and other real estate. + References No definition available. + Details
Name: | trmk_ChangeInFdicTrueUpProvision
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | trmk_FdicIndemnificationAssetAbstract
Namespace Prefix: | trmk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of receivable assets originating from the indemnification agreement with FDIC to partially cover losses on certain loans and other real estate. + References No definition available. + Details
Name: | trmk_FdicIndemnificationAssets
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Increase (decrease) in other receivables related to indemnification assets. + References No definition available. + Details
Name: | trmk_IncreaseDecreaseInExpectedCashFlowsFdicIndemnificationAsset
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (decrease) in other receivables related to accretion of indemnification assets. + References No definition available. + Details
Name: | trmk_IncreaseDecreaseInOtherReceivablesAccretionIndemnificationAsset
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of losses on covered assets incurred by the acquirer the FDIC will reimburse under a loss share agreement. + References No definition available. + Details
Name: | trmk_PercentageOfCoveredLoanAndOtherRealEstateLossesIncurredInHundredths
Namespace Prefix: | trmk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount as of the balance sheet date of receivable assets originating from the indemnification agreement with FDIC to partially cover losses on certain loans and other real estate. + References No definition available. + Details
Name: | trmk_ProvisionForFdicTrueUp
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the total of noninterest income derived from certain activities and assets. + References No definition available. + Details
Name: | trmk_ReductionInFdicIndemnificationAssetIncludedInOtherNoninterestIncome
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (Decrease) in the carrying amount as of the balance sheet date of receivable assets originating from the indemnification agreement with FDIC to partially cover losses on certain loans and other real estate as related to transfers to FDIC claims due. + References No definition available. + Details
Name: | trmk_TransfersToFdicClaimsReceivable
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration