Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2025

Stockholders' Equity Note [Abstract]

Table of Actual Regulatory Capital Amounts and Ratios

The following table provides Trustmark’s and TB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at December 31, 2025 and 2024 ($ in thousands):


	Actual
	Regulatory Capital					Minimum			To Be Well
	Amount		Ratio			Requirement			Capitalized
At December 31, 2025:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,814,295		11.72	%		7.000	%	n/a
Trustmark Bank		1,908,101		12.33	%		7.000	%		6.50	%

Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,874,295		12.11	%		8.500	%	n/a
Trustmark Bank		1,908,101		12.33	%		8.500	%		8.00	%

Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	2,231,283		14.41	%		10.500	%	n/a
Trustmark Bank		2,093,123		13.52	%		10.500	%		10.00	%

Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,874,295		10.18	%		4.00	%	n/a
Trustmark Bank		1,908,101		10.37	%		4.00	%		5.00	%

At December 31, 2024:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,729,672		11.54	%		7.000	%	n/a
Trustmark Bank		1,828,044		12.20	%		7.000	%		6.50	%

Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,789,672		11.94	%		8.500	%	n/a
Trustmark Bank		1,828,044		12.20	%		8.500	%		8.00	%

Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	2,094,874		13.97	%		10.500	%	n/a
Trustmark Bank		2,009,544		13.41	%		10.500	%		10.00	%

Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,789,672		9.99	%		4.00	%	n/a
Trustmark Bank		1,828,044		10.21	%		4.00	%		5.00	%

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

The following tables present the net change in the components of accumulated other comprehensive income (loss) and the related tax effects allocated to each component for the years ended December 31, 2025, 2024 and 2023 ($ in thousands).


	Before Tax			Tax (Expense)			Net of Tax
	Amount			Benefit			Amount
Year Ended December 31, 2025
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising during the period	$	61,389		$	(15,346	)	$	46,043
Reclassification adjustment for net (gains) losses realized in net income		—			—			—
Change in net unrealized holding loss on securities transferred to held to maturity		13,765			(3,441	)		10,324
Total securities available for sale and transferred securities		75,154			(18,787	)		56,367
Pension and other postretirement benefit plans:
Change in the actuarial loss of pension and other postretirement benefit plans		(660	)		165			(495	)
Reclassification adjustments for changes realized in net income:
Net change in prior service costs		15			(4	)		11
Recognized net loss due to lump sum settlements		(79	)		20			(59	)
Change in net actuarial loss		127			(32	)		95
Total pension and other postretirement benefit plans		(597	)		149			(448	)
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective cash flow hedge derivatives		9,299			(2,325	)		6,974
Reclassification adjustment for (gain) loss realized in net income		9,521			(2,380	)		7,141
Total cash flow hedge derivatives		18,820			(4,705	)		14,115
Total other comprehensive income (loss)	$	93,377		$	(23,343	)	$	70,034

Year Ended December 31, 2024
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising during the period	$	(13,666	)	$	3,417		$	(10,249	)
Reclassification adjustment for net (gains) losses realized in net income		182,792			(45,698	)		137,094
Change in net unrealized holding loss on securities transferred to held to maturity		14,587			(3,647	)		10,940
Total securities available for sale and transferred securities		183,713			(45,928	)		137,785
Pension and other postretirement benefit plans:
Change in the actuarial loss of pension and other postretirement benefit plans		1,460			(365	)		1,095
Reclassification adjustments for changes realized in net income:
Net change in prior service costs		111			(28	)		83
Recognized net loss due to lump sum settlements		(13	)		3			(10	)
Change in net actuarial loss		248			(62	)		186
Total pension and other postretirement benefit plans		1,806			(452	)		1,354
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective cash flow hedge derivatives		(22,232	)		5,558			(16,674	)
Reclassification adjustment for (gain) loss realized in net income		18,132			(4,533	)		13,599
Total cash flow hedge derivatives		(4,100	)		1,025			(3,075	)
Total other comprehensive income (loss)	$	181,419		$	(45,355	)	$	136,064

Year Ended December 31, 2023
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising during the period	$	50,537		$	(12,404	)	$	38,133
Reclassification adjustment for net (gains) losses realized in net income		(39	)		10			(29	)
Change in net unrealized holding loss on securities transferred to held to maturity		15,557			(3,889	)		11,668
Total securities available for sale and transferred securities		66,055			(16,283	)		49,772
Pension and other postretirement benefit plans:
Change in the actuarial loss of pension and other postretirement benefit plans		(691	)		173			(518	)
Reclassification adjustments for changes realized in net income:
Net change in prior service costs		111			(28	)		83
Recognized net loss due to lump sum settlements		25			(6	)		19
Change in net actuarial loss		177			(44	)		133
Total pension and other postretirement benefit plans		(378	)		95			(283	)
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective cash flow hedge derivatives		(8,131	)		2,033			(6,098	)
Reclassification adjustment for (gain) loss realized in net income		16,385			(4,096	)		12,289
Total cash flow hedge derivatives		8,254			(2,063	)		6,191
Total other comprehensive income (loss)	$	73,931		$	(18,251	)	$	55,680

Summary of Changes in Balances 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 Derivative			Total
Balance, January 1, 2023	$	(254,442	)	$	(5,792	)	$	(15,169	)	$	(275,403	)
Other comprehensive income (loss) before reclassification		49,801			(518	)		(6,098	)		43,185
Amounts reclassified from accumulated other comprehensive income (loss)		(29	)		235			12,289			12,495
Net other comprehensive income (loss)		49,772			(283	)		6,191			55,680
Balance, December 31, 2023		(204,670	)		(6,075	)		(8,978	)		(219,723	)
Other comprehensive income (loss) before reclassification		691			1,095			(16,674	)		(14,888	)
Amounts reclassified from accumulated other comprehensive income (loss)		137,094			259			13,599			150,952
Net other comprehensive income (loss)		137,785			1,354			(3,075	)		136,064
Balance, December 31, 2024		(66,885	)		(4,721	)		(12,053	)		(83,659	)
Other comprehensive income (loss) before reclassification		56,367			(495	)		6,974			62,846
Amounts reclassified from accumulated other comprehensive income (loss)		—			47			7,141			7,188
Net other comprehensive income (loss)		56,367			(448	)		14,115			70,034
Balance, December 31, 2025	$	(10,518	)	$	(5,169	)	$	2,062		$	(13,625	)