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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Benefit Plans [Abstract]  
Net Periodic Benefit
The table below outlines the components of the Company’s net periodic benefit recognized during the three and nine months ended September 30, 2018 and 2017 for its pension and other postretirement benefit plans:

  
Three months ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2018
  
2017
  
2018
  
2017
 
             
Service cost
 
$
8
   
11
   
-
   
26
 
Interest cost
  
299
   
326
   
47
   
54
 
Expected return on plan assets
  
(753
)
  
(686
)
  
(323
)
  
(190
)
Amortization of net (gain) loss
  
-
   
17
   
(189
)
  
(89
)
Amortization of prior service cost
  
-
   
-
   
(73
)
  
23
 
Net periodic benefit
 
$
(446
)
  
(332
)
  
(538
)
  
(176
)


  
Nine months ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2018
  
2017
  
2018
  
2017
 
             
Service cost
 
$
25
   
33
   
52
   
77
 
Interest cost
  
898
   
977
   
156
   
164
 
Expected return on plan assets
  
(2,259
)
  
(2,058
)
  
(704
)
  
(571
)
Amortization of net loss (gain)
  
-
   
50
   
(367
)
  
(258
)
Amortization of prior service cost
  
-
   
-
   
(28
)
  
68
 
Net periodic benefit
 
$
(1,336
)
  
(998
)
  
(891
)
  
(520
)