Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 29,148us-gaap_NetIncomeLoss	$ 29,003us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses, net	2,132	(742)
Depreciation and amortization	9,080	8,756
Net amortization of securities	2,050	1,958
Securities gains, net	0us-gaap_GainLossOnSaleOfInvestments	(389)us-gaap_GainLossOnSaleOfInvestments
Gains on sales of loans, net	(3,713)us-gaap_GainLossOnSaleOfLoansAndLeases	(1,839)us-gaap_GainLossOnSaleOfLoansAndLeases
Deferred income tax provision	4,625us-gaap_DeferredIncomeTaxExpenseBenefit	2,400us-gaap_DeferredIncomeTaxExpenseBenefit
Proceeds from sales of loans held for sale	236,732	186,788
Purchases and originations of loans held for sale	(275,587)	(162,937)
Originations and sales of mortgage servicing rights, net	(3,126)	(2,315)
Increase in bank-owned life insurance	(1,179)us-gaap_BankOwnedLifeInsuranceIncome	(1,166)us-gaap_BankOwnedLifeInsuranceIncome
Net decrease in other assets	2,275	7,891
Net decrease in other liabilities	(9,839)	(14,172)
Other operating activities, net	4,554	4,159
Net cash (used in) provided by operating activities	(2,848)	57,395
Investing Activities
Proceeds from calls and maturities of securities held to maturity	24,372	17,411
Proceeds from calls and maturities of securities available for sale	91,776	80,309
Proceeds from sales of securities available for sale	0	26,274
Purchases of securities held to maturity	(6,738)	(2,968)
Purchases of securities available for sale	(112,367)	(289,931)
Net decrease in federal funds sold and securities purchased under reverse repurchase agreements	1,885	7,253
Net decrease in member bank stock	14,100trmk_DecreaseIncreaseInMemberBankStock	0trmk_DecreaseIncreaseInMemberBankStock
Net decrease (increase) in loans	78,479	(78,370)
Purchases of premises and equipment	(2,790)	(2,337)
Proceeds from sales of premises and equipment	1,300	2,251
Proceeds from sales of other real estate	10,632	7,330
Investments in tax credit and other partnerships	(38)	0
Net cash provided by (used in) investing activities	100,611	(232,778)
Financing Activities
Net increase in deposits	208,632us-gaap_IncreaseDecreaseInDeposits	262,217us-gaap_IncreaseDecreaseInDeposits
Net increase in federal funds purchased and securities sold under repurchase agreements	79,644	7,754
Net (decrease) increase in short-term borrowings	(350,051)	16
Payments on long-term FHLB advances	(30)	(60)
Common stock dividends	(15,639)us-gaap_PaymentsOfDividendsCommonStock	(15,597)us-gaap_PaymentsOfDividendsCommonStock
Common stock issued-net, long-term incentive plans	(830)	(792)
Excess tax expense from stock-based compensation arrangements	(218)	(97)
Net cash (used in) provided by financing activities	(78,492)	253,441
Increase in cash and cash equivalents	19,271	78,058
Cash and cash equivalents at beginning of period	315,973	345,761
Cash and cash equivalents at end of period	$ 335,244	$ 423,819

The increase (decrease) during the reporting period in member bank stock.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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The net cash inflow or outflow from the fund lent to other financial institution arising from the excess in reserve deposited at Federal Reserve Bank to meet legal requirement. This borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash inflow or outflow from investment sold under the agreement to reacquire such investment.

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The increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities.

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The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash outflow from payments for Federal Home Loan Bank (FHLBank) advances.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

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-Publisher FASB

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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-Publisher FASB

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

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- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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-Paragraph 12

-Subparagraph (a),(b)

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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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-Publisher FASB

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The cash flow from the funds lent to and (borrowed from) other financial reporting institutions arising from excess or shortfall in reserve deposited at the Federal Reserve Bank to meet legal requirements. This lending and borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash outflow or inflow from investments purchased under the agreement to resell such investment.

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

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- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 9

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

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-Paragraph 12

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- Definition

The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

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-Topic 230

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-Paragraph 12

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- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 21

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

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-Paragraph 3

-Subparagraph (a)(2)

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