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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2012
Employee Benefit Plans [Abstract]  
Activity of restricted stock awards
                         
    2012     2011     2010  

Beginning of period

    29,715       28,925       27,775  

Granted

    11,000       11,000       10,150  

Vested

    (8,910     (9,432     (7,425

Forfeited

    (1,135     (778     (1,575
   

 

 

   

 

 

   

 

 

 

Nonvested, end of period

    30,670       29,715       28,925