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Employee Post-Retirement Benefits (Tables)
6 Months Ended
Jun. 30, 2012
Employee Post-Retirement Benefits [Abstract]  
Employee Post-Retirement Benefits
Three Months Ended June 30
  
Six Months Ended June 30
 
(Dollars in thousands)
 
2012
  
2011
  
2012
  
2011
 
Components of net periodic benefit cost
            
Service cost
 $150  $127  $300  $254 
Interest cost
  188   200   376   400 
Expected return on plan assets
  -   -   -   - 
Amortization of transition obligation
  15   15   30   30 
Amortization of prior service cost
  (19)  (14)  (38)  (28)
Recognized net actuarial loss
  135   107   270   214 
Net periodic benefit cost
 $469  $435  $938  $870 
Employer's Contributions For Current Premiums [Table Text Block]
Employer's contributions for current premiums:
              June 30, 2012 
Contributions made for the six months ended June 30, 2012
             $168 
Expected contributions for remainder of 2012
              169 
Total estimated employer contributions for fiscal year 2012
             $337