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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures

The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
 
Three months ended June 30
 
Six months ended June 30
 
2019
 
2018
 
2019
 
2018
 
        (in thousands)
Interest cost
$
815

 
$
696

 
$
1,630

 
$
1,527

Expected return on plan assets
(689
)
 
(573
)
 
(1,378
)
 
(1,024
)
Net amortization and deferral
495

 
551

 
990

 
1,215

Net periodic pension cost
$
621

 
$
674

 
$
1,242

 
$
1,718


The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
 
Three months ended June 30
 
Six months ended June 30
 
2019
 
2018
 
2019
 
2018
 
        (in thousands)
Interest cost
$
15

 
$
12

 
$
30

 
$
29

Net accretion and deferral
(139
)
 
(139
)
 
(278
)
 
(280
)
Net periodic benefit
$
(124
)
 
$
(127
)
 
$
(248
)
 
$
(251
)