Defined Benefit and Other Postretirement Benefits (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Trustmark Capital Accumulation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Years of service required to vest	3 years
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year	$ 128,974,000	$ 103,235,000
Benefit obligation from business combination	0	43,138,000
Service cost	495,000	595,000	547,000
Interest cost	5,299,000	4,758,000	3,942,000
Actuarial loss (gain)	11,675,000	(8,060,000)
Benefits paid	(7,041,000)	(14,692,000)
Settlement loss from BancTrust termination	1,355,000	0
Benefit obligation, end of year	101,904,000	128,974,000	103,235,000
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	126,142,000	76,660,000
Fair value of plan assets from business combination	0	40,391,000
Actual return on plan assets	4,632,000	21,661,000
Employer contributions	1,407,000	2,122,000
Benefit payments	(7,041,000)	(14,692,000)
Fair value of plan assets, end of year	86,287,000	126,142,000	76,660,000
Funded status at end of year - net liability	(15,617,000)	(2,832,000)
Balance, end of period	86,287,000	126,142,000	76,660,000
Amounts recognized in accumulated other comprehensive income (loss) [Abstract]
Net loss	28,100,000	15,436,000
Net periodic benefit cost [Abstract]
Service cost	495,000	595,000	547,000
Interest cost	5,299,000	4,758,000	3,942,000
Expected return on plan assets	(6,245,000)	(7,720,000)	(5,983,000)
Recognized net loss due to BancTrust termination	1,355,000	0	0
Recognized net loss due to lump sum settlements	905,000	2,225,000	0
Recognized net actuarial (gain) loss	(283,000)	5,516,000	5,225,000
Net periodic benefit cost	1,526,000	5,374,000	3,731,000
Other changes in plan assets and benefit obligation recognized in other comprehensive (loss), before taxes [Abstract]
Total recognized in other comprehensive income (loss)	12,664,000	(29,742,000)	(3,861,000)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	14,190,000	(24,368,000)	(130,000)
Weighted-average assumptions as of end of year [Abstract]
Discount rate for benefit obligation (in hundredths)	3.57%	4.30%	3.50%
Discount rate for net periodic benefit cost (in hundredths)	4.30%	3.50%	4.00%
Expected long-term return on plan assets (in hundredths)	7.50%	7.50%	8.00%
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	100.00%	100.00%
Fair value of plan assets	86,287,000	126,142,000	76,660,000
Contributions [Abstract]
Expected minimum required contribution, Prior to HAFTA	1,800,000	2,100,000
Expected minimum required contribution in the next fiscal year	0
Expected minimum required contribution, after HAFTA	0
Actual contribution	1,000,000
Estimated future benefit payments [Abstract]
2015	10,654,000
2016	8,402,000
2017	7,734,000
2018	6,346,000
2019	6,286,000
2020 - 2024	28,762,000
Accumulated other comprehensive loss expected to be recognized during next fiscal year as components of net periodic benefit cost	(5,000,000)
Other Benefit Plans - Defined Contribution Plan [Abstract]
Trustmarks contribution to defined contribution plan	6,700,000	6,800,000	5,700,000
Trustmark contributions to the plan	100.00%
Contributions up to a maximum of eligible compensation	6.00%
Period when associates may become eligible to make elective deferral contributions after employment	30 days
Eligible associates must complete number of years of service	1 year
Trustmark Capital Accumulation Plan [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	86,133,000	118,999,000
Balance, end of period	86,133,000	118,999,000
Asset target allocations [Abstract]
Fair value of plan assets	86,133,000	118,999,000
Trustmark Capital Accumulation Plan [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	6,980,000
Balance, end of period	0	6,980,000
Asset target allocations [Abstract]
Fair value of plan assets	0	6,980,000
Trustmark Capital Accumulation Plan [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	154,000	163,000
Balance, end of period	154,000	163,000
Asset target allocations [Abstract]
Fair value of plan assets	154,000	163,000
Trustmark Capital Accumulation Plan [Member] \| Money Market Funds [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	7,544,000	6,563,000
Balance, end of period	7,544,000	6,563,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	8.70%	5.20%
Fair value of plan assets	7,544,000	6,563,000
Trustmark Capital Accumulation Plan [Member] \| Money Market Funds [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	7,544,000	6,563,000
Balance, end of period	7,544,000	6,563,000
Asset target allocations [Abstract]
Fair value of plan assets	7,544,000	6,563,000
Trustmark Capital Accumulation Plan [Member] \| Money Market Funds [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Money Market Funds [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Mutual Funds [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	10,267,000	22,225,000
Balance, end of period	10,267,000	22,225,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	11.90%	17.60%
Fair value of plan assets	10,267,000	22,225,000
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Mutual Funds [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	10,267,000	15,245,000
Balance, end of period	10,267,000	15,245,000
Asset target allocations [Abstract]
Fair value of plan assets	10,267,000	15,245,000
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Mutual Funds [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	6,980,000
Balance, end of period	0	6,980,000
Asset target allocations [Abstract]
Fair value of plan assets	0	6,980,000
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Mutual Funds [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Equity Mutual Funds [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	62,265,000	73,608,000
Balance, end of period	62,265,000	73,608,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	72.20%	58.40%
Fair value of plan assets	62,265,000	73,608,000
Trustmark Capital Accumulation Plan [Member] \| Equity Mutual Funds [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	62,265,000	73,608,000
Balance, end of period	62,265,000	73,608,000
Asset target allocations [Abstract]
Fair value of plan assets	62,265,000	73,608,000
Trustmark Capital Accumulation Plan [Member] \| Equity Mutual Funds [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Equity Mutual Funds [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Equity Securities [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	6,057,000	23,583,000
Balance, end of period	6,057,000	23,583,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	7.00%	18.70%
Fair value of plan assets	6,057,000	23,583,000
Trustmark Capital Accumulation Plan [Member] \| Equity Securities [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	6,057,000	23,583,000
Balance, end of period	6,057,000	23,583,000
Asset target allocations [Abstract]
Fair value of plan assets	6,057,000	23,583,000
Trustmark Capital Accumulation Plan [Member] \| Equity Securities [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Equity Securities [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Hedge Funds [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	154,000	163,000
Balance, end of period	154,000	163,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	0.20%	0.10%
Fair value of plan assets	154,000	163,000
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Hedge Funds [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Hedge Funds [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	0	0
Balance, end of period	0	0
Asset target allocations [Abstract]
Fair value of plan assets	0	0
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Hedge Funds [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	163,000	163,000
Fair value of plan assets, end of year	154,000	163,000
Change in fair value	(9,000)	0
Balance, end of period	154,000	163,000
Asset target allocations [Abstract]
Fair value of plan assets	154,000	163,000
Trustmark Capital Accumulation Plan [Member] \| Cash and Cash Equivalents [Member]
Asset target allocations [Abstract]
Target asset allocation, minimum (in hundredths)	0.00%
Target asset allocation, maximum (in hundredths)	10.00%
Trustmark Capital Accumulation Plan [Member] \| Fixed Income Funds [Member]
Asset target allocations [Abstract]
Target asset allocation, minimum (in hundredths)	10.00%
Target asset allocation, maximum (in hundredths)	30.00%
Trustmark Capital Accumulation Plan [Member] \| Domestic Equity [Member]
Asset target allocations [Abstract]
Target asset allocation, minimum (in hundredths)	30.00%
Target asset allocation, maximum (in hundredths)	55.00%
Trustmark Capital Accumulation Plan [Member] \| International Equity [Member]
Asset target allocations [Abstract]
Target asset allocation, minimum (in hundredths)	10.00%
Target asset allocation, maximum (in hundredths)	30.00%
Trustmark Capital Accumulation Plan [Member] \| Other Investments [Member]
Asset target allocations [Abstract]
Target asset allocation, minimum (in hundredths)	0.00%
Target asset allocation, maximum (in hundredths)	20.00%
Supplemental Retirement Plans [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year	52,489,000	56,619,000
Benefit obligation from business combination	0	1,658,000
Service cost	296,000	597,000	679,000
Interest cost	2,198,000	1,943,000	2,067,000
Actuarial loss (gain)	7,392,000	(4,187,000)
Benefits paid	(2,631,000)	(4,141,000)
Prior service cost due to amendment	0	0
Benefit obligation, end of year	59,744,000	52,489,000	56,619,000
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	0	0
Employer contributions	2,631,000	4,141,000
Benefit payments	(2,631,000)	(4,141,000)
Fair value of plan assets, end of year	0	0	0
Funded status at end of year - net liability	(59,744,000)	(52,489,000)
Balance, end of period	0	0	0
Amounts recognized in accumulated other comprehensive income (loss) [Abstract]
Net loss	21,242,000	14,509,000
Prior service cost	1,860,000	2,110,000
Amounts recognized	23,102,000	16,619,000
Net periodic benefit cost [Abstract]
Service cost	296,000	597,000	679,000
Interest cost	2,198,000	1,943,000	2,067,000
Amortization of prior service credits	250,000	250,000	250,000
Recognized net actuarial (gain) loss	661,000	1,038,000	861,000
Net periodic benefit cost	3,405,000	3,828,000	3,857,000
Other changes in plan assets and benefit obligation recognized in other comprehensive (loss), before taxes [Abstract]
Net (gain) loss	6,733,000	(5,224,000)	2,507,000
Prior service cost	0	0	198,000
Amortization of prior service cost	(250,000)	(250,000)	(250,000)
Total recognized in other comprehensive income (loss)	6,483,000	(5,474,000)	2,455,000
Total recognized in net periodic benefit cost and other comprehensive income (loss)	9,888,000	(1,646,000)	6,312,000
Weighted-average assumptions as of end of year [Abstract]
Discount rate for benefit obligation (in hundredths)	3.57%	4.30%	3.50%
Discount rate for net periodic benefit cost (in hundredths)	4.30%	3.50%	4.00%
Asset target allocations [Abstract]
Fair value of plan assets	0	0	0
Estimated future benefit payments [Abstract]
2015	2,868,000
2016	3,145,000
2017	3,479,000
2018	3,591,000
2019	3,656,000
2020 - 2024	19,504,000
Accumulated other comprehensive loss expected to be recognized during next fiscal year as components of net periodic benefit cost	(992,000)
Accumulated other comprehensive loss expected to be recognized during next fiscal year as prior service cost	250,000
BancTrust Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pre-tax gain recognized in OCI as a result of the termination of the plan	1,200,000
Change in benefit obligation [Roll Forward]
Benefits paid	(38,853,000)	0
Change in plan assets [ Roll Forward]
Benefit payments	(38,853,000)	0
Other Benefit Plans - Defined Contribution Plan [Abstract]
Contribution to complete the plan termination	$ 334,000

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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement. that is attributable to the acquisition.

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For a defined benefit plan, the minimum required employer contribution in the next fiscal year.

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For a defined benefit plan, the previous minimum required employer contribution for the period, prior to government enactment.

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Target allocation maximum percentage in asset securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation minimum percentage in asset securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Total amount recognized in net periodic benefit cost and other comprehensive income (loss).

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Refers to the deferral contribution of the month.

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The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The amount of prior service cost that would be recognized during next fiscal year.

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No definition available.

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The loss recognized on settlement from BancTrust termination.

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Number of years service required before retirement benefits vest.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The interest rate used to adjust for the time value of money for the plan.

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The amount of increase in the benefit obligation attributed to business combinations.

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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