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Employee Post-Retirement Benefits (Tables)
3 Months Ended
Mar. 31, 2014
Employee Post-Retirement Benefits [Abstract]  
Employee Post-Retirement Benefits
The components of net periodic benefit cost were as follows:

 
 
Three Months Ended
 
 
 
March 31
 
(Dollars in thousands)
 
2014
  
2013
 
Service cost
 
$
55
  
$
67
 
Interest cost
  
132
   
120
 
Amortization of prior service credit
  
(236
)
  
(236
)
Recognized net actuarial loss
  
98
   
120
 
Net periodic benefit cost
 
$
49
  
$
71