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Stock-Based Compensation (Schedule of Restricted Stock Award Activity) (Details) (Restricted Stock, USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Restricted Stock
    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Outstanding at beginning of year, Shares 19,750  
Granted, Shares 0  
Vested, Shares (5,750)  
Forfeited or Cancelled, Shares 0  
Outstanding at June 30, 2012, Shares 14,000 19,750
Outstanding at beginning of year, Price $ 22.96  
Granted, Price $ 0.00  
Vested, Price $ 21.00  
Forfeited or Cancelled, Price $ 0.00  
Outstanding at beginning of year, Weighted-average remaining contractual term (in years) 2 years 7 months 10 days 3 years 5 months 23 days
Outstanding at June 30, 2012, Price $ 23.76 $ 22.96
Outstanding at June 30, 2012, Wieghted-average remaining contractual term (in years) 2 years 7 months 10 days 3 years 5 months 23 days