Defined Benefit and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2016

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 Plan for the periods presented ($ in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Service cost	$	106		$	127		$	322		$	387
Interest cost		847			867			2,507			2,593
Expected return on plan assets		(426	)		(1,297	)		(2,470	)		(3,890	)
Recognized net loss due to lump sum settlements		463			603			3,134			1,499
Recognized net actuarial loss		714			969			2,035			2,907
Net periodic benefit cost	$	1,704		$	1,269		$	5,528		$	3,496

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 September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Service cost	$	73	$	107	$	221	$	323
Interest cost		542		520		1,630		1,563
Amortization of prior service cost		63		63		188		188
Recognized net actuarial loss		214		246		649		745
Net periodic benefit cost	$	892	$	936	$	2,688	$	2,819