Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

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 (income) 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,
	2013			2012			2013			2012
	(In thousands)
Defined Benefit Pension Plans
Service cost	$	326		$	304		$	976		$	910
Interest cost	1,166			1,214			3,500			3,644
Expected return on plan assets	(1,949		)	(1,731		)	(5,845		)	(5,194		)
Amortization of prior service credit	—			—			(1		)	(1		)
Amortization of unrecognized net loss	946			614			2,838			1,843
Net periodic benefit cost	$	489		$	401		$	1,468		$	1,202
Postretirement Benefit Plan
Service cost	$	5		$	—		$	14		$	—
Interest cost	36			37			108			110
Amortization of prior service cost (credit)	27			(75		)	233			(225		)
Amortization of unrecognized net gain	(18		)	(7		)	(55		)	(21		)
Net periodic benefit cost (income)	$	50		$	(45	)	$	300		$	(136	)