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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Shareholders' Equity  
Summary of shares granted and vested

 

 
   2012   2011   2010  
 
   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

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

Shares granted

     84,017     25.09     77,300     24.20     63,900     22.89  

Shares vested

     (70,473 )   24.38     (56,622 )   23.76     (44,530 )   22.63  
                                 

Unvested shares, end of year

     127,654     24.88     114,110     22.70     93,432     22.31