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

6 Months Ended

Jun. 30, 2018

Retirement Benefits [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   June 30,						Six Months Ended   June 30,
	2018			2017			2018			2017
Qualified Pension Plan
Service cost, benefits earned during the period	$	—		$	—		$	—		$	—
Interest cost on projected benefit obligation	384			403			769			806
Expected return on plan assets	(826		)	(785		)	(1,652		)	(1,570		)
Amortization of unrecognized transition obligation	—			—			—			—
Amortization of unrecognized prior service cost	—			—			—			—
Amortization of unrecognized net loss	44			58			87			116
Net periodic pension benefit	$	(398	)	$	(324	)	$	(796	)	$	(648	)
Supplemental Pension Plan
Service cost, benefits earned during the period	$	—		$	—		$	—		$	—
Interest cost on projected benefit obligation	12			12			24			24
Expected return on plan assets	—			—			—			—
Amortization of unrecognized prior service cost	—			—			—			—
Amortization of unrecognized net loss	2			1			4			2
Net periodic supplemental pension cost	$	14		$	13		$	28		$	26
Postretirement Plan, Medical and Life
Service cost, benefits earned during the period	$	—		$	—		$	—		$	—
Interest cost on projected benefit obligation	4			4			7			8
Expected return on plan assets	—			—			—			—
Amortization of unrecognized prior service cost	(55		)	(55		)	(110		)	(110		)
Amortization of unrecognized net loss	27			29			55			58
Net periodic postretirement, medical and life benefit	$	(24	)	$	(22	)	$	(48	)	$	(44	)