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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The net periodic benefit cost for the Corporation’s Pension Plan consisted of the following components:
 
Three months ended September 30
 
Nine months ended September 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Service cost (1)
$
172

 
$
145

 
$
516

 
$
435

Interest cost
880

 
851

 
2,640

 
2,553

Expected return on plan assets
(580
)
 
(752
)
 
(1,739
)
 
(2,256
)
Net amortization and deferral
605

 
782

 
1,815

 
2,346

Net periodic benefit cost
$
1,077

 
$
1,026

 
$
3,232

 
$
3,078


(1)
Service cost was related to administrative costs associated with the plan and was not due to the accrual of additional participant benefits.
The net periodic cost (benefit) of the Corporation’s Postretirement Plan consisted of the following components:
 
Three months ended September 30
 
Nine months ended September 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Interest cost
21

 
52

 
64

 
156

Expected return on plan assets
—

 
—

 
(1
)
 
—

Net accretion and deferral
(138
)
 
(65
)
 
(413
)
 
(195
)
Net periodic benefit
$
(117
)
 
$
(13
)
 
$
(350
)
 
$
(39
)