COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit costs

The components of net periodic expense for the Corporation’s pension and other benefit plans for the periods indicated are as follows (in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Qualified Pension Plan
Service cost, benefits earned during the period	$	354		$	271		$	1,061		$	813
Interest cost on projected benefit obligation	457			435			1,371			1,305
Expected return on plan assets	(824		)	(793		)	(2,471		)	(2,379		)
Amortization of unrecognized transition obligation	—			—			—			—
Amortization of unrecognized prior service cost	2			2			7			6
Amortization of unrecognized net loss	369			160			1,106			480
Net periodic pension cost	$	358		$	75		$	1,074		$	225
Supplemental Pension Plan
Service cost, benefits earned during the period	$	11		$	10		$	33		$	30
Interest cost on projected benefit obligation	13			14			37			40
Expected return on plan assets	—			—			—			—
Amortization of unrecognized prior service cost	—			—			—			—
Amortization of unrecognized net loss	12			9			38			19
Net periodic supplemental pension cost	$	36		$	33		$	108		$	89
Postretirement Plan, Medical and Life
Service cost, benefits earned during the period	$	11		$	11		$	35		$	33
Interest cost on projected benefit obligation	16			18			48			54
Expected return on plan assets	—			—			—			—
Amortization of unrecognized prior service cost	(24		)	(24		)	(72		)	(72		)
Amortization of unrecognized net loss	3			—			7			—
Net periodic postretirement, medical and life cost	$	6		$	5		$	18		$	15