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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic benefit cost for the Corporation’s Pension Plan consisted of the following components:
 
Three months ended March 31
 
2015
 
2014
 
(in thousands)
Service cost (1)
$
145

 
$
92

Interest cost
851

 
853

Expected return on plan assets
(752
)
 
(811
)
Net amortization and deferral
782

 
244

Net periodic benefit cost
$
1,026

 
$
378

 
(1)
The Pension Plan service cost recorded for the three months ended March 31, 2015 and 2014 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, excluding the $1.5 million plan amendment gain in 2014:
 
Three months ended March 31
 
2015
 
2014
 
(in thousands)
Service cost (1)
$
—

 
$
15

Interest cost
52

 
61

Net accretion and deferral
(65
)
 
(95
)
Net periodic benefit
$
(13
)
 
$
(19
)

(1)
As a result of the plan amendment, additional participant benefits are not accrued under the Postretirement Plan after February 1, 2014.