Defined Benefit and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

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,
	2020			2019			2020			2019
Service cost	$	63		$	53		$	127		$	106
Interest cost		61			90			121			180
Expected return on plan assets		(39	)		(50	)		(77	)		(101	)
Recognized net loss due to lump sum settlements		40			63			40			94
Recognized net actuarial loss		82			93			163			186
Net periodic benefit cost	$	207		$	249		$	374		$	465

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,
	2020		2019		2020		2019
Service cost	$	20	$	28	$	39	$	55
Interest cost		387		501		801		1,042
Amortization of prior service cost		38		62		75		125
Recognized net actuarial loss		236		154		482		316
Net periodic benefit cost	$	681	$	745	$	1,397	$	1,538