Defined Benefit and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2023			2022
Service cost	$	13		$	29
Interest cost		73			48
Expected return on plan assets		(26	)		(30	)
Recognized net loss due to lump sum settlements		25			—
Recognized net actuarial loss		—			60
Net periodic benefit cost	$	85		$	107

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 March 31,
	2023		2022
Service cost	$	17	$	18
Interest cost		520		330
Amortization of prior service cost		28		28
Recognized net actuarial loss		77		255
Net periodic benefit cost	$	642	$	631