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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Benefit Plans [Abstract]  
Components of Company's net periodic cost
The table below outlines the components of the Company's net periodic benefit recognized during the three months ended March 31, 2016 and 2015 for its pension and other postretirement benefit plans:

  
For the three months ended March 31,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2016
  
2015
  
2016
  
2015
 
             
Service cost
 
$
15
   
15
   
32
   
39
 
Interest cost
  
337
   
330
   
61
   
65
 
Expected return on plan assets
  
(644
)
  
(684
)
  
(181
)
  
(181
)
Amortization of net (gain) loss
  
87
   
(40
)
  
(54
)
  
35
 
Amortization of prior service cost (credit)
  
-
   
-
   
23
   
(22
)
Net periodic benefit
 
$
(205
)
  
(379
)
  
(119
)
  
(64
)