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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six months ended June 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Service cost (1)
$
194

 
$
145

 
$
344

 
$
290

Interest cost
879

 
851

 
1,760

 
1,702

Expected return on plan assets
(433
)
 
(752
)
 
(1,159
)
 
(1,504
)
Net amortization and deferral
428

 
782

 
1,210

 
1,564

Net periodic benefit cost
$
1,068

 
$
1,026

 
$
2,155

 
$
2,052


(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 June 30
 
Six months ended June 30
 
2016
 
2015
 
2016
 
2015
 
(in thousands)
Interest cost
5

 
52

 
43

 
104

Expected return on plan assets
(1
)
 
—

 
(1
)
 
—

Net accretion and deferral
(210
)
 
(65
)
 
(275
)
 
(130
)
Net periodic benefit
$
(206
)
 
$
(13
)
 
$
(233
)
 
$
(26
)