Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2014

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost (income) for the Corporation's qualified and nonqualified pension plans and nonqualified postretirement benefits plan

The components of net periodic benefit cost for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
	(In thousands)
Defined Benefit Pension Plans
Service cost	$	250		$	326		$	751		$	976
Interest cost	1,312			1,166			3,936			3,500
Expected return on plan assets	(2,078		)	(1,949		)	(6,235		)	(5,845		)
Amortization of prior service credit	—			—			(1		)	(1		)
Amortization of unrecognized net loss	569			946			1,707			2,838
Net periodic benefit cost	$	53		$	489		$	158		$	1,468
Postretirement Benefit Plan
Service cost	$	5		$	5		$	14		$	14
Interest cost	36			36			107			108
Amortization of prior service cost	32			27			97			233
Amortization of unrecognized net gain	(26		)	(18		)	(78		)	(55		)
Net periodic benefit cost	$	47		$	50		$	140		$	300