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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
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 month periods ended March 31, 2015 and 2014 for its pension and other postretirement benefit plans:
 
  
For the three months ended March 31,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2015
  
2014
  
2015
  
2014
 
         
Service cost
 
$
15
   
18
   
39
   
14
 
Interest cost
  
330
   
336
   
65
   
32
 
Expected return on plan assets
  
(684
)
  
(609
)
  
(181
)
  
(169
)
Amortization of net (gain) loss
  
(40
)
  
-
   
35
   
(72
)
Amortization of prior service cost (credit)
  
-
   
-
   
(22
)
  
(45
)
Net periodic benefit
 
$
(379
)
  
(255
)
  
(64
)
  
(240
)