Defined Benefit and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2022

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 September 30,						Nine Months Ended September 30,
	2022			2021			2022			2021
Service cost	$	28		$	63		$	86		$	189
Interest cost		48			43			144			129
Expected return on plan assets		(30	)		(33	)		(90	)		(98	)
Recognized net loss due to lump sum settlements		—			183			—			183
Recognized net actuarial loss		52			149			172			446
Net periodic benefit cost	$	98		$	405		$	312		$	849

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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Service cost	$	18	$	19	$	54	$	57
Interest cost		316		277		962		847
Amortization of prior service cost		28		28		83		84
Recognized net actuarial loss		243		295		742		896
Net periodic benefit cost	$	605	$	619	$	1,841	$	1,884