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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2017 and 2016 for its pension and other postretirement benefit plans:

  
For the three months ended June 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2017
  
2016
  
2017
  
2016
 
             
Service cost
 
$
11
   
16
   
23
   
32
 
Interest cost
  
322
   
349
   
54
   
61
 
Expected return on plan assets
  
(686
)
  
(681
)
  
(190
)
  
(180
)
Amortization of net loss (gain)
  
10
   
5
   
(83
)
  
(55
)
Amortization of prior service cost
  
-
   
-
   
22
   
22
 
Net periodic benefit
 
$
(343
)
  
(311
)
  
(174
)
  
(120
)
 
  
For the six months ended June 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
  
2017
   
2016
   
2017
   
2016
 
                 
Service cost
 
$
22
   
31
   
51
   
64
 
Interest cost
  
651
   
686
   
110
   
123
 
Expected return on plan assets
  
(1,372
)
  
(1,325
)
  
(381
)
  
(360
)
Amortization of net loss (gain)
  
33
   
92
   
(169
)
  
(109
)
Amortization of prior service cost
  
-
   
-
   
45
   
45
 
Net periodic benefit
 
$
(666
)
  
(516
)
  
(344
)
  
(237
)