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FDIC Indemnification Asset (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
FDIC Indemnification Asset [Abstract] |  |  |  |
FDIC True-up provisions | $ 961 |  | $ 601 |
Balance, beginning of period | 28,348 |  | 0 |
Additions from acquisition |  |  | 33,333 |
Accretion | 187 |  | 185 |
Transfers to FDIC claims receivable | (1,271) |  |  |
Loss-share payments received from FDIC |  |  | (986) |
Change in expected cash flows | (2,925) | [1] | (4,157) | [1]
Change in FDIC true-up provision | (360) |  | (27) |
Balance, end of period | $ 23,979 |  | $ 28,348 |
[1] | The decrease was due to loan pay-offs, improved cash flow projections, and lower loss expectations for covered loans.

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_ChangeInFdicTrue-UpProvision
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

X
- Definition Changes in the FDIC indemnification asset due to additions from acquisitions. + References No definition available. + Details
Name: | trmk_FdicIndemnificationAssetAdditionsFromAcquisition
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_Increasedecreaseinotherreceivablesaccretionindemnificationassets
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cash received from the Federal Deposit Insurance Corporation for losses on a specified pool of assets, maximizing asset recoveries and minimizing Federal Deposit Insurance Corporation losses. + References No definition available. + Details
Name: | trmk_Loss-SharePaymentsReceivedFromFdic
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_ProvisionForFdicTrue-Up
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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