Defined Benefit and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2015

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 Trustmark’s qualified defined benefit pension plans for the periods presented ($ in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Service cost	$	127		$	123		$	387		$	372
Interest cost		867			1,328			2,593			3,971
Expected return on plan assets		(1,297	)		(1,563	)		(3,890	)		(4,681	)
Recognized net loss due to lump sum settlements		603			1,709			1,499			2,459
Recognized net actuarial loss (gain)		969			(1,701	)		2,907			(229	)
Net periodic benefit cost	$	1,269		$	(104	)	$	3,496		$	1,892

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,
	2015		2014		2015		2014
Service cost	$	107	$	74	$	323	$	222
Interest cost		520		548		1,563		1,650
Amortization of prior service cost		63		63		188		188
Recognized net actuarial loss		246		164		745		497
Net periodic benefit cost	$	936	$	849	$	2,819	$	2,557