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Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2012
Employee Benefits [Abstract]  
Schedule of unvested RRP shares
     
Number
of Shares
   
Grant Date
Fair Value
 
               
 
Beginning of year
    4,500     $ 16.68  
 
Granted
           
 
Vested
    1,900       17.82  
 
End of year
    2,600     $ 15.85