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Benefit Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2016 and 2015 for its pension and other postretirement benefit plans:

  
For the three months ended June 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2016
  
2015
  
2016
  
2015
 
             
Service cost
 
$
16
   
15
   
32
   
39
 
Interest cost
  
349
   
330
   
61
   
64
 
Expected return on plan assets
  
(681
)
  
(684
)
  
(180
)
  
(180
)
Amortization of net (gain) loss
  
5
   
121
   
(55
)
  
(106
)
Amortization of prior service cost
  
-
   
-
   
22
   
67
 
Net periodic benefit
 
$
(311
)
  
(218
)
  
(120
)
  
(116
)

  
For the six months ended June 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2016
  
2015
  
2016
  
2015
 
             
Service cost
 
$
31
   
30
   
64
   
78
 
Interest cost
  
686
   
660
   
123
   
129
 
Expected return on plan assets
  
(1,325
)
  
(1,368
)
  
(360
)
  
(361
)
Amortization of net loss (gain)
  
92
   
81
   
(109
)
  
(71
)
Amortization of prior service cost
  
-
   
-
   
45
   
45
 
Net periodic benefit
 
$
(516
)
  
(597
)
  
(237
)
  
(180
)