Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Stockholders Equity Note [Abstract]

Table of Actual Regulatory Capital Amounts and Ratios

The following table provides Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at June 30, 2020 and December 31, 2019 ($ in thousands):

	Actual
	Regulatory Capital					Minimum			To Be Well
	Amount		Ratio			Requirement			Capitalized
At June 30, 2020:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,317,378		11.42	%		7.00	%	n/a
Trustmark National Bank		1,353,727		11.73	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,377,378		11.94	%		8.50	%	n/a
Trustmark National Bank		1,353,727		11.73	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,499,887		13.00	%		10.50	%	n/a
Trustmark National Bank		1,476,236		12.80	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,377,378		9.08	%		4.00	%	n/a
Trustmark National Bank		1,353,727		8.94	%		4.00	%		5.00	%
At December 31, 2019:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,312,668		11.93	%		7.00	%	n/a
Trustmark National Bank		1,352,893		12.30	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,372,668		12.48	%		8.50	%	n/a
Trustmark National Bank		1,352,893		12.30	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,457,760		13.25	%		10.50	%	n/a
Trustmark National Bank		1,437,985		13.07	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,372,668		10.48	%		4.00	%	n/a
Trustmark National Bank		1,352,893		10.35	%		4.00	%		5.00	%

Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects

	Six Months Ended June 30, 2020							Six Months Ended June 30, 2019
	Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount		Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising    during the period	$	43,155	$	(10,789	)	$	32,366	$	38,903		$	(9,726	)	$	29,177
Change in net unrealized holding loss on    securities transferred to held to maturity		1,639		(410	)		1,229		2,003			(501	)		1,502
Total securities available for sale    and transferred securities		44,794		(11,199	)		33,595		40,906			(10,227	)		30,679
Pension and other postretirement benefit plans:
Reclassification adjustments for changes realized    in net income:
Net change in prior service costs		75		(19	)		56		125			(31	)		94
Recognized net loss due to lump sum    settlements		40		(10	)		30		94			(23	)		71
Change in net actuarial loss		645		(161	)		484		502			(126	)		376
Total pension and other postretirement benefit    plans		760		(190	)		570		721			(180	)		541
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective    cash flow hedge derivatives		—		—			—		(164	)		41			(123	)
Reclassification adjustment for (gain) loss realized    in net income		—		—			—		(312	)		78			(234	)
Total cash flow hedge derivatives		—		—			—		(476	)		119			(357	)
Total other comprehensive income (loss)	$	45,554	$	(11,389	)	$	34,165	$	41,151		$	(10,288	)	$	30,863

Components of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands).  All amounts are presented net of tax.

	Securities Available for Sale and Transferred Securities			Defined Benefit Pension Items			Cash Flow Hedge Derivatives			Total
Balance at January 1, 2020	$	(8,017	)	$	(15,583	)	$	—		$	(23,600	)
Other comprehensive income (loss) before reclassification		33,595			—			—			33,595
Amounts reclassified from accumulated other    comprehensive income (loss)		—			570			—			570
Net other comprehensive income (loss)		33,595			570			—			34,165
Balance at June 30, 2020	$	25,578		$	(15,013	)	$	—		$	10,565
Balance at January 1, 2019	$	(43,824	)	$	(12,324	)	$	469		$	(55,679	)
Other comprehensive income (loss) before reclassification		30,679			—			(123	)		30,556
Amounts reclassified from accumulated other    comprehensive income (loss)		—			541			(234	)		307
Net other comprehensive income (loss)		30,679			541			(357	)		30,863
Balance at June 30, 2019	$	(13,145	)	$	(11,783	)	$	112		$	(24,816	)