Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2013

Shareholders' Equity [Abstract]

Table of actual regulatory capital amounts and ratios

Trustmark's and TNB's actual regulatory capital amounts and ratios are presented in the table below ($ in thousands):

											Minimum Regulatory
	Actual					Minimum Regulatory					Provision to be
	Regulatory Capital					Capital Required					Well-Capitalized
	Amount		Ratio			Amount		Ratio			Amount		Ratio
At March 31, 2013:
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,133,455		14.36	%	$	631,326		8.00	%		n/a		n/a
Trustmark National Bank		1,056,721		13.52	%		625,446		8.00	%	$	781,807		10.00	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,020,170		12.93	%	$	315,663		4.00	%		n/a		n/a
Trustmark National Bank		945,910		12.10	%		312,723		4.00	%	$	469,084		6.00	%
Tier 1 Capital (to Average Assets)
Trustmark Corporation	$	1,020,170		9.83	%	$	311,397		3.00	%		n/a		n/a
Trustmark National Bank		945,910		9.23	%		307,596		3.00	%	$	512,660		5.00	%
At December 31, 2012:
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,157,838		17.22	%	$	537,861		8.00	%		n/a		n/a
Trustmark National Bank		1,119,438		16.85	%		531,577		8.00	%	$	664,472		10.00	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,043,865		15.53	%	$	268,930		4.00	%		n/a		n/a
Trustmark National Bank		1,007,775		15.17	%		265,789		4.00	%	$	398,683		6.00	%
Tier 1 Capital (to Average Assets)
Trustmark Corporation	$	1,043,865		10.97	%	$	285,556		3.00	%		n/a		n/a
Trustmark National Bank		1,007,775		10.72	%		281,984		3.00	%	$	469,974		5.00	%

Components of accumulated other comprehensive income (loss) and the related tax effects

The following table presents the components of accumulated other comprehensive income and the related tax effects allocated to each component for the periods ended March 31, 2013 and 2012 ($ in thousands):

							Accumulated
							Other
	Before-Tax			Tax			Comprehensive
	Amount			Effect			Income- (Loss)
Balance, January 1, 2013	$	5,533		$	(2,138	)	$	3,395
Unrealized holding gains on AFS arising during period		2,234			(854	)		1,380
Adjustment for net gains realized in net income		(204	)		78			(126	)
Pension and other postretirement benefit plans		1,717			(657	)		1,060
Balance, March 31, 2013	$	9,280		$	(3,571	)	$	5,709
Balance, January 1, 2012	$	5,089		$	(1,968	)	$	3,121
Unrealized holding losses on AFS arising during period		(3,103	)		1,187			(1,916	)
Adjustment for net gains realized in net income		(1,050	)		402			(648	)
Pension and other postretirement benefit plans		1,587			(607	)		980
Balance, March 31, 2012	$	2,523		$	(986	)	$	1,537

Components of reclassifications out of accumulated other comprehensive income

The following table presents the amounts affecting accumulated other comprehensive income that are included in their entirety in net income for the periods presented ($ in thousands). Reclassification adjustments related to securities available for sale are included in securities gains, net in the accompanying consolidated statements of income. The amortization of prior service cost and recognized net actuarial loss on pension and other postretirement benefit plans are included in the computation of net periodic benefit cost (see Note 10 - Defined Benefit and Other Postretirement Benefits for additional details).

	Pre-Tax			Tax			After Tax
	Income			(Expense)			Income
	(Expense)			Benefit			(Expense)
Three Months Ended March 31, 2013:
Securities available for sale:
Reclassification adjustment for net gains realized in net income	$	204		$	(78	)	$	126
Pension and other postretirement benefit plans:
Amortization of prior service cost	$	(63	)	$	24		$	(39	)
Recognized net actuarial loss		(1,654	)		633			(1,021	)
Total pension and other postretirement benefit plans	$	(1,717	)	$	657		$	(1,060	)
Three Months Ended March 31, 2012:
Securities available for sale:
Reclassification adjustment for net gains realized in net income	$	1,050		$	(402	)	$	648
Pension and other postretirement benefit plans:
Amortization of prior service cost	$	(62	)	$	24		$	(38	)
Recognized net actuarial loss		(1,524	)		582			(942	)
Total pension and other postretirement benefit plans	$	(1,586	)	$	606		$	(980	)