Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 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 June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
	(In thousands)
Defined Benefit Pension Plans
Service cost	$	251		$	325		$	501		$	650
Interest cost	1,312			1,167			2,624			2,334
Expected return on plan assets	(2,079		)	(1,948		)	(4,157		)	(3,896		)
Amortization of prior service credit	(1		)	(1		)	(1		)	(1		)
Amortization of unrecognized net loss	569			946			1,138			1,892
Net periodic benefit cost	$	52		$	489		$	105		$	979
Postretirement Benefit Plan
Service cost	$	4		$	4		$	9		$	9
Interest cost	36			36			71			72
Amortization of prior service cost	33			153			65			206
Amortization of unrecognized net gain	(26		)	(18		)	(52		)	(37		)
Net periodic benefit cost	$	47		$	175		$	93		$	250