Defined Benefit and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

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,
	2021			2020			2021			2020
Service cost	$	63		$	63		$	126		$	127
Interest cost		43			61			86			121
Expected return on plan assets		(32	)		(39	)		(65	)		(77	)
Recognized net loss due to lump sum settlements		—			40			—			40
Recognized net actuarial loss		148			82			297			163
Net periodic benefit cost	$	222		$	207		$	444		$	374

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,
	2021		2020		2021		2020
Service cost	$	19	$	20	$	38	$	39
Interest cost		277		387		570		801
Amortization of prior service cost		28		38		56		75
Recognized net actuarial loss		295		236		601		482
Net periodic benefit cost	$	619	$	681	$	1,265	$	1,397