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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Benefit Plans [Abstract]  
Components of Company's net periodic benefit
The table below outlines the components of the Company's net periodic benefit recognized during the three months ended March 31, 2018 and 2017 for its pension and other postretirement benefit plans:

  
For the three months ended March 31,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2018
  
2017
  
2018
  
2017
 
             
Service cost
 
$
11
   
11
   
26
   
28
 
Interest cost
  
326
   
329
   
54
   
56
 
Expected return on plan assets
  
(687
)
  
(686
)
  
(190
)
  
(191
)
Amortization of net loss (gain)
  
17
   
23
   
(89
)
  
(86
)
Amortization of prior service cost
  
-
   
-
   
23
   
23
 
Net periodic benefit
 
$
(333
)
  
(323
)
  
(176
)
  
(170
)