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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2011
Shareholders' Equity.  
Summary of shares granted and vested

 

 
   2011   2010   2009  
 
   Number
of
Shares 		  Weighted
Average
Grant Date
Fair Value 		  Number
of
Shares 		  Weighted
Average
Grant Date
Fair Value 		  Number
of
Shares 		  Weighted
Average
Grant Date
Fair Value 		 

Unvested shares, beginning of year

     93,432   $ 22.31     74,062   $ 23.20     44,877   $ 27.10  

Shares granted

     77,300     24.20     63,900     22.89     63,700     19.27  

Shares vested

     (56,622 )   23.76     (44,530 )   22.63     (34,515 )   18.06  
                                 

Unvested shares, end of year

     114,110     22.70     93,432     22.31     74,062     23.20