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Stock-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Stock-Based Compensation [Abstract]      
Options, Outstanding, beginning of period 209,914    
Options, Exercised in Period (4,775)    
Options, Forfeited in Period (12,225)    
Options, Outstanding, end of period 192,914 209,914  
Options, Exercisable at Period End 164,914    
Weighted Average Exercise Price Per Share, Outstanding, $ 28.43    
Weighted Average Exercise Price Per Share, Exercised in Period $ 20.72    
Weighted Average Exercise Price Per Share, Forfeited in Period $ 29.65    
Weighted Average Exercise Price Per Share, Outstanding, $ 28.54 $ 28.43  
Weighted Average Exercise Price Per Share, Exercisable at End of Period $ 28.72    
Weighted Average Remaining Contractual Term, Outstanding, 5 years 8 months 12 days 6 years 3 months 18 days  
Weighted Average Remaining Contractual Term, Granted in Period 0 years    
Weighted Average Remaining Contractual Term, Exercised During Period 0 years 9 months 18 days    
Weighted Average Remaining Contractual Term, Forfeited During Period 5 years 2 months 12 days    
Weighted Average Remaining Contractual Term, Outstanding, 5 years 8 months 12 days 6 years 3 months 18 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 5 years    
Aggregate Intrinsic Value, Outstanding, $ 113    
Aggregate Intrinsic Value, Exercised in Period 31    
Aggregate Intrinsic Value, Outstanding, 370 113  
Aggregate Intrinsic Value, Exercisable at End of Period 293    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 33    
Amortization Date of Unrecognized Compensation Cost, Related to Non-Vested Options Granted in 2011 Dec. 31, 2012    
Share Price $ 30.20 $ 27.47 $ 24.02