Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks (noninterest-bearing)	$ 315,973us-gaap_CashAndDueFromBanks	$ 345,761us-gaap_CashAndDueFromBanks
Federal funds sold and securities purchased under reverse repurchase agreements	1,885	7,253
Securities available for sale (at fair value)	2,374,567us-gaap_AvailableForSaleSecurities	2,194,154us-gaap_AvailableForSaleSecurities
Securities held to maturity (fair value: $1,182,846-2014; $1,150,833-2013)	1,170,685us-gaap_HeldToMaturitySecurities	1,168,728us-gaap_HeldToMaturitySecurities
Loans held for sale (LHFS) (2014 includes $91,182 measured at fair value)	132,196us-gaap_LoansReceivableHeldForSaleNet	149,169us-gaap_LoansReceivableHeldForSaleNet
Loans held for investment (LHFI)	6,449,469	5,798,881
Less allowance for loan losses, LHFI	69,616	66,448
Net LHFI	6,379,853	5,732,433
Acquired loans:
Noncovered loans	525,783trmk_NoncoveredLoansCarryingValue	769,990trmk_NoncoveredLoansCarryingValue
Covered loans	23,626trmk_CarryingValueCoveredLoans	34,216trmk_CarryingValueCoveredLoans
Less allowance for loan losses, acquired loans	12,059	9,636
Net acquired loans	537,350	794,570
Net LHFI and acquired loans	6,917,203	6,527,003
Premises and equipment, net	200,781us-gaap_PropertyPlantAndEquipmentNet	207,283us-gaap_PropertyPlantAndEquipmentNet
Mortgage servicing rights	64,358us-gaap_ServicingAssetAtFairValueAmount	67,834us-gaap_ServicingAssetAtFairValueAmount
Goodwill	365,500us-gaap_Goodwill	372,851us-gaap_Goodwill
Identifiable intangible assets	33,234	41,990
Other real estate, excluding covered other real estate	92,509	106,539
Covered other real estate	6,060	5,108
FDIC indemnification asset	6,997trmk_FdicIndemnificationAssetDeprecated	14,347trmk_FdicIndemnificationAssetDeprecated
Other assets	568,685us-gaap_OtherAssets	582,363us-gaap_OtherAssets
Total Assets	12,250,633us-gaap_Assets	11,790,383us-gaap_Assets
Deposits:
Noninterest-bearing	2,748,635	2,663,503
Interest-bearing	6,949,723	7,196,399
Total deposits	9,698,358us-gaap_Deposits	9,859,902us-gaap_Deposits
Federal funds purchased and securities sold under repurchase agreements	443,543	251,587
Short-term borrowings	425,077us-gaap_ShortTermBorrowings	66,385us-gaap_ShortTermBorrowings
Long-term FHLB advances	1,253	8,458
Subordinated notes	49,936us-gaap_SubordinatedDebt	49,904us-gaap_SubordinatedDebt
Junior subordinated debt securities	61,856	61,856
Other liabilities	150,670us-gaap_OtherLiabilities	137,338us-gaap_OtherLiabilities
Total Liabilities	10,830,693us-gaap_Liabilities	10,435,430us-gaap_Liabilities
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 67,481,992 shares - 2014; 67,372,980 shares - 2013	14,060us-gaap_CommonStockValue	14,038us-gaap_CommonStockValue
Capital surplus	356,244us-gaap_AdditionalPaidInCapital	349,680us-gaap_AdditionalPaidInCapital
Retained earnings	1,092,120	1,034,966
Accumulated other comprehensive loss, net of tax	(42,484)	(43,731)
Total Shareholders' Equity	1,419,940us-gaap_StockholdersEquity	1,354,953us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity	$ 12,250,633	$ 11,790,383

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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The allowance for other loan and lease losses represents the reserve to cover probable credit losses related to specifically identified other loans and leases, as well as probable credit losses inherent in the remainder of the other loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for other loan losses in connection with business combinations determined to be appropriate.

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Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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