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Defined Benefit and Other Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2025

Trustmark Capital Accumulation Plan [Member]

Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]

Plan Benefit Obligation, Plan Assets and Funded Status of the Plan

The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for the Continuing Plan for the periods presented ($ in thousands):

		December 31,
		2025				2024
Change in benefit obligation:
Benefit obligation, beginning of year		$	5,531			$	5,923
Service cost			36				40
Interest cost			275				246
Actuarial (gain) loss			(23	)			(214	)
Benefits paid			(1,500	)			(464	)
Benefit obligation, end of year		$	4,319			$	5,531
Change in plan assets:
Fair value of plan assets, beginning of year		$	2,685			$	2,403
Actual return on plan assets			161				233
Employer contributions			299				513
Benefit payments			(1,500	)			(464	)
Fair value of plan assets, end of year		$	1,645			$	2,685
Funded status at end of year - net liability		$	(2,674	)		$	(2,846	)
Amounts recognized in accumulated other comprehensive loss:
Net (gain) loss - amount recognized		$	(574	)		$	(601	)
Actuarial (gain) loss included in benefit obligation:
Change in discount rate		$	120			$	(344	)
Change in mortality table			—				—
Other			(143	)			130
Actuarial (gain) loss		$	(23	)		$	(214	)

Net Periodic Benefit Cost

		Years Ended December 31,
		2025				2024				2023
Net periodic benefit cost:
Service cost		$	36			$	40			$	52
Interest cost			275				246				292
Expected return on plan assets			(125	)			(96	)			(107	)
Recognized net (gain) loss due to lump sum settlements			(79	)			(13	)			25
Recognized net actuarial loss			(7	)			—				—
Net periodic benefit cost		$	100			$	177			$	262
Other changes in plan assets and benefit obligation recognized in other    comprehensive income (loss), before taxes:
Net loss - Total recognized in other comprehensive income (loss)		$	27			$	(339	)		$	9
Total recognized in net periodic benefit cost and other comprehensive    income (loss)		$	127			$	(162	)		$	271
Weighted-average assumptions as of end of year:
Discount rate for benefit obligation			4.99	%			5.30	%			4.67	%
Discount rate for net periodic benefit cost			5.30	%			4.67	%			4.88	%
Expected long-term return on plan assets			5.00	%			5.00	%			5.00	%

Weighted-Average Asset Allocation

The weighted-average asset allocations by asset category are presented below for the Continuing Plan at December 31, 2025 and 2024.

		December 31,
		2025				2024
Money market fund			5.0	%			2.0	%
Exchange traded funds:
Equity securities			30.0	%			33.0	%
Fixed income			55.0	%			59.0	%
International			10.0	%			6.0	%
Total			100.0	%			100.0	%

Plan Assets Measured at Fair Value

The following tables set forth by level, within the fair value hierarchy, the Continuing Plan’s assets measured at fair value at December 31, 2025 and 2024 ($ in thousands):

		December 31, 2025
		Total				Level 1				Level 2				Level 3
Money market fund		$	75			$	75			$	—			$	—
Exchange traded funds:
Equity securities			500				500				—				—
Fixed income			905				905				—				—
International			165				165				—				—
Total assets at fair value		$	1,645			$	1,645			$	—			$	—

		December 31, 2024
		Total				Level 1				Level 2				Level 3
Money market fund		$	55			$	55			$	—			$	—
Exchange traded funds:
Equity securities			874				874				—				—
Fixed income			1,600				1,600				—				—
International			156				156				—				—
Total assets at fair value		$	2,685			$	2,685			$	—			$	—

Estimated Future Benefit Payments and Other Disclosures

The following table presents the expected benefit payments, which reflect expected future service, for the Continuing Plan ($ in thousands):

Year		Amount
2026		$	624
2027			846
2028			513
2029			374
2030			334
2031 - 2035			1,178

Supplemental Retirement Plan [Member]

Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]

Plan Benefit Obligation, Plan Assets and Funded Status of the Plan

The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands):

		December 31,
		2025				2024
Change in benefit obligation:
Benefit obligation, beginning of year		$	38,162			$	41,619
Service cost			15				45
Interest cost			1,921				1,851
Actuarial (gain) loss			845				(1,009	)
Benefits paid			(3,868	)			(4,344	)
Benefit obligation, end of year		$	37,075			$	38,162
Change in plan assets:
Fair value of plan assets, beginning of year		$	—			$	—
Employer contributions			3,868				4,344
Benefit payments			(3,868	)			(4,344	)
Fair value of plan assets, end of year		$	—			$	—
Funded status at end of year - net liability		$	(37,075	)		$	(38,162	)
Amounts recognized in accumulated other comprehensive loss:
Net loss		$	7,465			$	6,880
Prior service cost			—				15
Amounts recognized		$	7,465			$	6,895
Actuarial (gain) loss included in benefit obligation:
Change in discount rate		$	788			$	(1,794	)
Change in mortality table			—				—
Other			57				785
Actuarial (gain) loss		$	845			$	(1,009	)

Net Periodic Benefit Cost

		Years Ended December 31,
		2025				2024				2023
Net periodic benefit cost:
Service cost		$	15			$	45			$	69
Interest cost			1,921				1,851				2,013
Amortization of prior service cost			15				111				111
Recognized net actuarial loss			261				346				284
Net periodic benefit cost		$	2,212			$	2,353			$	2,477
Other changes in plan assets and benefit obligation recognized in other    comprehensive income (loss), before taxes:
Net (gain) loss		$	585			$	(1,355	)		$	479
Amortization of prior service cost			(15	)			(111	)			(111	)
Total recognized in other comprehensive income (loss)		$	570			$	(1,466	)		$	368
Total recognized in net periodic benefit cost and other comprehensive    income (loss)		$	2,782			$	887			$	2,845
Weighted-average assumptions as of end of year:
Discount rate for benefit obligation			4.99	%			5.30	%			4.67	%
Discount rate for net periodic benefit cost			5.30	%			4.67	%			4.88	%

Estimated Future Benefit Payments and Other Disclosures

The following table presents the expected benefits payments for Trustmark’s supplemental retirement plans ($ in thousands):

Year		Amount
2026		$	3,856
2027			3,687
2028			3,562
2029			3,563
2030			3,465
2031 - 2035			14,656

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Tabular disclosure of assets, including [financial] instruments measured at fair value, by class that are measured at fair value on a recurring basis. Fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits.

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Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

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Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

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