Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

The net periodic benefit of the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:

	Three months ended March 31
	2017			2016
	(in thousands)
Interest cost	$	17		$	38
Net accretion and deferral	(141		)	(65		)
Net periodic benefit	$	(124	)	$	(27	)

The net periodic benefit cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:

	Three months ended March 31
	2017			2016
	(in thousands)
Service cost (1)	$	—		$	150
Interest cost	830			881
Expected return on plan assets	(451		)	(726		)
Net amortization and deferral	663			782
Net periodic benefit cost	$	1,042		$	1,087

(1) The Pension Plan was curtailed effective January 1, 2008. Service cost was related to administrative costs associated with the plan and was not due to the accrual of additional participant benefits.