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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2016 and 2015 for its pension and other postretirement benefit plans:

  
For the three months ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2016
  
2015
  
2016
  
2015
 
             
Service cost
 
$
15
   
15
   
32
   
47
 
Interest cost
  
343
   
337
   
61
   
72
 
Expected return on plan assets
  
(669
)
  
(684
)
  
(180
)
  
(182
)
Amortization of net loss (gain)
  
46
   
77
   
(54
)
  
(34
)
Amortization of prior service cost
  
-
   
-
   
22
   
23
 
Net periodic benefit
 
$
(265
)
  
(255
)
  
(119
)
  
(74
)
 
  
For the nine months ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2016
  
2015
  
2016
  
2015
 
             
Service cost
 
$
46
   
45
   
96
   
125
 
Interest cost
  
1,029
   
997
   
184
   
201
 
Expected return on plan assets
  
(1,994
)
  
(2,052
)
  
(540
)
  
(543
)
Amortization of net loss (gain)
  
138
   
158
   
(163
)
  
(105
)
Amortization of prior service cost
  
-
   
-
   
67
   
68
 
Net periodic benefit
 
$
(781
)
  
(852
)
  
(356
)
  
(254
)