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FDIC Indemnification Asset (Details) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Apr. 15, 2011 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
FDIC Indemnification Asset [Abstract] |  |  |  |
FDIC loss-share agreement covered loans and other real estate losses (in hundredths) | 80.00% |  |  |
FDIC True-up provisions |  | $ 2,400 |  | $ 2,100
Reduction of FDIC indemnification asset included in other noninterest income - Covered Loans |  | 1,300 | $ 561 |
Reduction of FDIC indemnification asset included in noninterest income - Covered Other Real Estate |  | 621 |  |
Balance at beginning of period |  | 6,997 | 14,347 |
Amortization |  | (844) | (1,127) |
Transfers to FDIC claims |  | (1,583) | (1,761) |
Change in expected cash flows |  | (1,638) | (293) |
Change in FDIC true up-provision |  | (300) | (300) |
Balance at end of period |  | $ 2,632 | $ 10,866 |

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
- References No definition available. + Details
Name: | trmk_FdicIndemnificationAssetAbstract
Namespace Prefix: | trmk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (decrease) in other receivables related to accretion (amortization) of indemnification assets. + References No definition available. + Details
Name: | trmk_IncreaseDecreaseInOtherReceivablesAccretionAmortizationIndemnificationAsset
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 estimated amount as of the balance sheet date of the payment due to the FDIC at the termination of the indemnification agreement should actual losses be less than the thresholds established in the agreement. + 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. Which included a reduction of the FDIC indemnification asset due to sales and valuation adjustments of covered other real estate. + References No definition available. + Details
Name: | trmk_ReductionInFDICIndemnificationAssetIncludedInNoninterestIncome
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of decreases to the indemnification asset due to write offs of loans, net of recoveries, relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetNetWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration