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Shareholders' Equity (Schedule of Non-vested restricted shares granted and vested) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Balance 63,777 61,642
Granted 57,012 52,139
Vested (5,130) (49,805)
Cancelled (407) (5,504)
Stock Dividends 110,688 5,305
Balance 115,252 63,777