Defined Benefit and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2021			2020
Service cost	$	63		$	64
Interest cost		43			60
Expected return on plan assets		(33	)		(38	)
Recognized net actuarial loss		149			81
Net periodic benefit cost	$	222		$	167

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,
	2021		2020
Service cost	$	19	$	19
Interest cost		293		414
Amortization of prior service cost		28		37
Recognized net actuarial loss		306		246
Net periodic benefit cost	$	646	$	716