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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and 2016 for its pension and other postretirement benefit plans:

  
For the three months ended March 31,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2017
  
2016
  
2017
  
2016
 
             
Service cost
 
$
11
   
15
   
28
   
32
 
Interest cost
  
329
   
337
   
56
   
61
 
Expected return on plan assets
  
(686
)
  
(644
)
  
(191
)
  
(181
)
Amortization of net loss (gain)
  
23
   
87
   
(86
)
  
(54
)
Amortization of prior service cost
  
-
   
-
   
23
   
23
 
Net periodic benefit
 
$
(323
)
  
(205
)
  
(170
)
  
(119
)