Defined Benefit and Other Postretirement Benefits (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	$ 77,764,000
Fair value of plan assets, end of year	72,304,000	77,764,000
Balance, end of period	72,304,000	77,764,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	100.00%	100.00%
Fair value of plan assets	72,304,000	77,764,000
Estimated future benefit payments [Abstract]
Accumulated other comprehensive loss expected to be recognized during next fiscal year	4,000,000
Other Benefit Plans - Defined Contribution Plan [Abstract]
Defined contribution plan contribution	5,400,000	5,300,000	5,200,000
Trustmark Capital Accumulation Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Years of service required to vest (in years)		3 Y
One-time curtailment gain			1,900,000
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year	94,136,000	91,709,000
Service cost	522,000	550,000	392,000
Interest cost	4,460,000	4,777,000	4,837,000
Actuarial loss	7,620,000	3,766,000
Benefits paid	(6,182,000)	(6,666,000)
Curtailment gain		0
Benefit obligation, end of year	100,556,000	94,136,000	91,709,000
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	77,764,000	72,175,000
Actual return on plan assets	(331,000)	10,330,000
Employer contributions	1,053,000	1,925,000
Benefit payments	(6,182,000)	(6,666,000)
Fair value of plan assets, end of year	72,304,000	77,764,000	72,175,000
Funded status at end of year - net liability	(28,252,000)	(16,372,000)
Balance, end of period	72,304,000	77,764,000	72,175,000
Amounts recognized in accumulated other comprehensive income (loss) [Abstract]
Net loss - amount recognized	49,040,000	39,333,000
Net periodic benefit cost [Abstract]
Service cost	522,000	550,000	392,000
Interest cost	4,460,000	4,777,000	4,837,000
Expected return on plan assets	(5,882,000)	(5,926,000)	(6,036,000)
Amortization of prior service credits	0	0	(127,000)
Curtailment gain			(1,887,000)
Recognized net actuarial loss	4,127,000	3,397,000	2,872,000
Net periodic benefit cost	3,227,000	2,798,000	51,000
Other changes in plan assets and benefit obligation recognized in other comprehensive loss, before taxes [Abstract]
Net (gain) loss	9,707,000	(4,035,000)	(3,032,000)
Amortization of prior service credits	0	0	2,015,000
Total recognized in other comprehensive loss	9,707,000	(4,035,000)	(1,017,000)
Total recognized in net periodic benefit cost and other comprehensive loss	12,934,000	(1,237,000)	(966,000)
Weighted-average assumptions as of end of year [Abstract]
Discount rate for benefit obligation (in hundredths)	4.00%	5.05%	5.50%
Discount rate for net periodic benefit cost (in hundredths)	5.05%	5.50%	6.00%
Expected long-term return on plan assets (in hundredths)	8.00%	8.00%	8.00%
Rate of compensation increase (in hundredths)	3.00%	4.00%	4.00%
Voluntary contribution	1,000,000	1,900,000
Asset target allocations [Abstract]
Fair value of plan assets	72,304,000	77,764,000	72,175,000
Estimated future benefit payments [Abstract]
2012	12,209,000
2013	7,593,000
2014	7,700,000
2015	6,706,000
2016	6,554,000
2017-2020	30,205,000
Other Benefit Plans - Defined Contribution Plan [Abstract]
Minimum required contribution	896,000	0
Expected minimum required contribution in next fiscal year	3,400,000
Trustmark Capital Accumulation Plan [Member] \| Level 1 [ Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	69,814,000	75,870,000
Balance, end of period	69,814,000	75,870,000
Asset target allocations [Abstract]
Fair value of plan assets	69,814,000	75,870,000
Trustmark Capital Accumulation Plan [Member] \| Level 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	2,189,000	1,297,000
Balance, end of period	2,189,000	1,297,000
Asset target allocations [Abstract]
Fair value of plan assets	2,189,000	1,297,000
Trustmark Capital Accumulation Plan [Member] \| Level 3 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	301,000	597,000
Balance, end of period	301,000	597,000
Asset target allocations [Abstract]
Fair value of plan assets	301,000	597,000
Trustmark Capital Accumulation Plan [Member] \| Money Market Funds [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	2,189,000	1,297,000
Balance, end of period	2,189,000	1,297,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	3.00%	1.70%
Fair value of plan assets	2,189,000	1,297,000
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	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 2 [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	2,189,000	1,297,000
Balance, end of period	2,189,000	1,297,000
Asset target allocations [Abstract]
Fair value of plan assets	2,189,000	1,297,000
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	14,422,000	14,341,000
Balance, end of period	14,422,000	14,341,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	19.90%	18.40%
Fair value of plan assets	14,422,000	14,341,000
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	14,422,000	14,341,000
Balance, end of period	14,422,000	14,341,000
Asset target allocations [Abstract]
Fair value of plan assets	14,422,000	14,341,000
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	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] \| 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	50,886,000	57,334,000
Balance, end of period	50,886,000	57,334,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	70.40%	73.70%
Fair value of plan assets	50,886,000	57,334,000
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	50,886,000	57,334,000
Balance, end of period	50,886,000	57,334,000
Asset target allocations [Abstract]
Fair value of plan assets	50,886,000	57,334,000
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
Balance, end of period	0
Asset target allocations [Abstract]
Fair value of plan assets	0
Trustmark Capital Accumulation Plan [Member] \| Equity Securities [Member]
Change in plan assets [ Roll Forward]
Fair value of plan assets, end of year	4,506,000	4,195,000
Balance, end of period	4,506,000	4,195,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	6.30%	5.40%
Fair value of plan assets	4,506,000	4,195,000
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	4,506,000	4,195,000
Balance, end of period	4,506,000	4,195,000
Asset target allocations [Abstract]
Fair value of plan assets	4,506,000	4,195,000
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
Balance, end of period		0
Asset target allocations [Abstract]
Fair value of plan assets		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
Balance, end of period		0
Asset target allocations [Abstract]
Fair value of plan assets		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	301,000	597,000
Balance, end of period	301,000	597,000
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	0.40%	0.80%
Fair value of plan assets	301,000	597,000
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	597,000	4,930,000
Fair value of plan assets, end of year	301,000	597,000
Sales, net	(373,000)	(5,016,000)
Net gains included in plan	(8,000)	678,000
Change in fair value	85,000	5,000
Balance, end of period	301,000	597,000
Asset target allocations [Abstract]
Fair value of plan assets	301,000	597,000
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 [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 Plan [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year	45,433,000	41,598,000
Service cost	589,000	756,000	913,000
Interest cost	2,276,000	2,242,000	2,209,000
Actuarial loss	5,831,000	2,627,000
Benefits paid	(2,676,000)	(1,818,000)
Curtailment gain	1,193,000	28,000
Benefit obligation, end of year	52,646,000	45,433,000	41,598,000
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	0	0
Employer contributions	2,676,000	1,818,000
Benefit payments	(2,676,000)	(1,818,000)
Fair value of plan assets, end of year	0	0	0
Funded status at end of year - net liability	(52,646,000)	(45,433,000)
Balance, end of period	0	0	0
Amounts recognized in accumulated other comprehensive income (loss) [Abstract]
Net loss - amount recognized	17,226,000	11,890,000
Prior service cost	2,412,000	1,455,000
Amounts recognized	19,638,000	13,345,000
Net periodic benefit cost [Abstract]
Service cost	589,000	756,000	913,000
Interest cost	2,276,000	2,242,000	2,209,000
Amortization of prior service credits	236,000	152,000	150,000
Recognized net actuarial loss	495,000	355,000	237,000
Net periodic benefit cost	3,596,000	3,505,000	3,509,000
Other changes in plan assets and benefit obligation recognized in other comprehensive loss, before taxes [Abstract]
Net (gain) loss	5,336,000	2,272,000	2,115,000
Prior service credits	1,192,000	28,000	20,000
Amortization of prior service credits	(236,000)	(152,000)	(150,000)
Total recognized in other comprehensive loss	6,292,000	2,148,000	1,985,000
Total recognized in net periodic benefit cost and other comprehensive loss	9,888,000	5,653,000	5,494,000
Weighted-average assumptions as of end of year [Abstract]
Discount rate for benefit obligation (in hundredths)	4.00%	5.05%	5.50%
Discount rate for net periodic benefit cost (in hundredths)	5.05%	5.50%	6.00%
Asset target allocations [Abstract]
Fair value of plan assets	0	0	0
Estimated future benefit payments [Abstract]
2012	2,357,000
2013	2,613,000
2014	2,771,000
2015	2,951,000
2016	3,122,000
2017-2020	17,665,000
Accumulated other comprehensive loss expected to be recognized during next fiscal year	862,000
Prior service cost to be recognized during next fiscal year	$ 243,000

For a defined benefit plan, the minimum required employer contribution for the period.

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The net gain (loss) included in plan assets.

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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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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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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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Purchases, sales, and settlements of plan assets that occurred during the period.

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

+ References

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

-Publisher FASB

-Number 88

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 106

-Paragraph 518

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-Name Statement of Financial Accounting Standard (FAS)

-Number 87

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The aggregate amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits.

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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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The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date.

+ References

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

-Publisher FASB

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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The net gain (loss) previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

+ References

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

-Publisher FASB

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

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The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 28

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