COMPONENTS OF QUARTERLY AND YEAR TO DATE 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,
	2017			2016			2017			2016
Qualified Pension Plan
Service cost, benefits earned during the period	$	—		$	298		$	—		$	594
Interest cost on projected benefit obligation	403			470			806			940
Expected return on plan assets	(785		)	(756		)	(1,570		)	(1,511		)
Amortization of unrecognized transition obligation	—			—			—			—
Amortization of unrecognized prior service cost	—			2			—			4
Amortization of unrecognized net loss	58			383			116			767
Net periodic pension cost (benefit)	$	(324	)	$	397		$	(648	)	$	794

Supplemental Pension Plan
Service cost, benefits earned during the period	$	—		$	10		$	—		$	21
Interest cost on projected benefit obligation	12			13			24			26
Expected return on plan assets	—			—			—			—
Amortization of unrecognized prior service cost	—			—			—			—
Amortization of unrecognized net loss	1			7			2			13
Net periodic supplemental pension cost	$	13		$	30		$	26		$	60

Postretirement Plan, Medical and Life
Service cost, benefits earned during the period	$	—		$	12		$	—		$	24
Interest cost on projected benefit obligation	4			18			8			35
Expected return on plan assets	—			—			—			—
Amortization of unrecognized prior service cost	(55		)	(25		)	(110		)	(49		)
Amortization of unrecognized net loss	29			6			58			12
Net periodic postretirement, medical and life cost (benefit)	$	(22	)	$	11		$	(44	)	$	22