Defined Benefit and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2020			2019
Service cost	$	64		$	53
Interest cost		60			90
Expected return on plan assets		(38	)		(51	)
Recognized net loss due to lump sum settlements		—			31
Recognized net actuarial loss		81			93
Net periodic benefit cost	$	167		$	216

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,
	2020		2019
Service cost	$	19	$	27
Interest cost		414		541
Amortization of prior service cost		37		63
Recognized net actuarial loss		246		162
Net periodic benefit cost	$	716	$	793