Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks (noninterest-bearing)	$ 335,244us-gaap_CashAndDueFromBanks	$ 315,973us-gaap_CashAndDueFromBanks
Federal funds sold and securities purchased under reverse repurchase agreements	0	1,885
Securities available for sale (at fair value)	2,381,459us-gaap_AvailableForSaleSecurities	2,374,567us-gaap_AvailableForSaleSecurities
Securities held to maturity (fair value: $1,212,505-2015; $1,182,846-2014)	1,184,554us-gaap_HeldToMaturitySecurities	1,170,685us-gaap_HeldToMaturitySecurities
Loans held for sale (LHFS) (includes $133,754 and $91,182 measured at fair value)	150,365us-gaap_LoansReceivableHeldForSaleNet	132,196us-gaap_LoansReceivableHeldForSaleNet
Loans held for investment (LHFI)	6,413,876	6,449,469
Less allowance for loan losses, LHFI	71,321	69,616
Net LHFI	6,342,555	6,379,853
Acquired loans:
Noncovered loans	478,172trmk_NoncoveredLoansCarryingValue	525,783trmk_NoncoveredLoansCarryingValue
Covered loans	20,271trmk_CarryingValueCoveredLoans	23,626trmk_CarryingValueCoveredLoans
Less allowance for loan losses, acquired loans	11,837	12,059
Net acquired loans	486,606	537,350
Net LHFI and acquired loans	6,829,161	6,917,203
Premises and equipment, net	198,039us-gaap_PropertyPlantAndEquipmentNet	200,781us-gaap_PropertyPlantAndEquipmentNet
Mortgage servicing rights	62,903us-gaap_ServicingAssetAtFairValueAmount	64,358us-gaap_ServicingAssetAtFairValueAmount
Goodwill	365,500us-gaap_Goodwill	365,500us-gaap_Goodwill
Identifiable intangible assets	31,250	33,234
Other real estate, excluding covered other real estate	90,175	92,509
Covered other real estate	4,794	6,060
FDIC indemnification asset	4,743us-gaap_FDICIndemnificationAsset	6,997us-gaap_FDICIndemnificationAsset
Other assets	540,977us-gaap_OtherAssets	568,685us-gaap_OtherAssets
Total Assets	12,179,164us-gaap_Assets	12,250,633us-gaap_Assets
Deposits:
Noninterest-bearing	2,936,875	2,748,635
Interest-bearing	6,970,115	6,949,723
Total deposits	9,906,990us-gaap_Deposits	9,698,358us-gaap_Deposits
Federal funds purchased and securities sold under repurchase agreements	523,187	443,543
Short-term borrowings	50,570us-gaap_ShortTermBorrowings	425,077us-gaap_ShortTermBorrowings
Long-term FHLB advances	1,222	1,253
Subordinated notes	49,944us-gaap_SubordinatedDebt	49,936us-gaap_SubordinatedDebt
Junior subordinated debt securities	61,856	61,856
Other liabilities	139,311us-gaap_OtherLiabilities	150,670us-gaap_OtherLiabilities
Total Liabilities	10,733,080us-gaap_Liabilities	10,830,693us-gaap_Liabilities
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 67,556,591 shares - 2015; 67,481,992 shares - 2014	14,076us-gaap_CommonStockValue	14,060us-gaap_CommonStockValue
Capital surplus	358,583us-gaap_AdditionalPaidInCapital	356,244us-gaap_AdditionalPaidInCapital
Retained earnings	1,103,077	1,092,120
Accumulated other comprehensive loss, net of tax	(29,652)	(42,484)
Total Shareholders' Equity	1,446,084us-gaap_StockholdersEquity	1,419,940us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity	$ 12,179,164	$ 12,250,633

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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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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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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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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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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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