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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following:
 
Three months ended March 31
 
2018
 
2017
 
(in thousands)
Interest cost
$
17

 
$
17

Net accretion and deferral
(141
)
 
(141
)
Net periodic benefit
$
(124
)
 
$
(124
)

The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
 
Three months ended March 31
 
2018
 
2017
 
(in thousands)
Interest cost
$
831

 
$
830

Expected return on plan assets
(451
)
 
(451
)
Net amortization and deferral
664

 
663

Net periodic pension cost
$
1,044

 
$
1,042