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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Benefit Plans [Abstract]  
Components of Company's net periodic cost
The table below outlines the components of the Company's net periodic expense (benefit) recognized during the three month and six month periods ended June 30, 2013 and 2012 for its pension and other postretirement benefit plans:

 
For the three months ended June 30,
 
 
Pension Benefits
 
Other Postretirement Benefits
 
(dollars in thousands)
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
Service cost
 
$
20
   
12
   
14
   
8
 
Interest cost
  
322
   
365
   
27
   
25
 
Expected return on plan assets
  
(597
)
  
(474
)
  
(126
)
  
(112
)
Amortization of net loss (gain)
  
111
   
102
   
(10
)
  
(5
)
Amortization of prior service credit
  
-
   
-
   
(65
)
  
(65
)
Net periodic expense (benefit)
 
$
(144
)
  
5
   
(160
)
  
(149
)

 
 
For the six months ended June 30,
 
 
 
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2013
  
2012
  
2013
  
2012
 
 
 
  
  
  
 
Service cost
 
$
34
   
24
   
26
   
16
 
Interest cost
  
637
   
730
   
51
   
51
 
Expected return on plan assets
  
(1,095
)
  
(948
)
  
(249
)
  
(225
)
Amortization of net loss (gain)
  
258
   
204
   
(25
)
  
(10
)
Amortization of prior service credit
  
-
   
-
   
(131
)
  
(131
)
Net periodic expense (benefit)
 
$ 
(166
)
  
10
   
(328
)
  
(299
)