Defined Benefit and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2023

Trustmark Capital Accumulation Plan [Member]

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

Net Periodic Benefit Cost

The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2023			2022			2023			2022
Service cost	$	13		$	29		$	26		$	58
Interest cost		73			48			146			96
Expected return on plan assets		(27	)		(30	)		(53	)		(60	)
Recognized net loss due to lump sum settlements		—			—			25			—
Recognized net actuarial loss		—			60			—			120
Net periodic benefit cost	$	59		$	107		$	144		$	214

Supplemental Retirement Plan [Member]

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

Net Periodic Benefit Cost

The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Service cost	$	17	$	18	$	34	$	36
Interest cost		498		316		1,018		646
Amortization of prior service cost		27		27		55		55
Recognized net actuarial loss		69		244		146		499
Net periodic benefit cost	$	611	$	605	$	1,253	$	1,236