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Stock-Based Compensation (Summary of Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Stock-Based Compensation [Abstract]      
Options, Outstanding, beginning of year 225,670    
Options, Granted 1,100    
Options, Exercised (12,933)    
Options, Forfeited (7,825)    
Options, Outstanding, end of year 206,012   225,670
Options, Exercisable, end of year 176,862    
Weighted Average Exercise Price Per Share, Outstanding, beginning of year $ 26.39    
Weighted Average Exercise Price Per Share, Granted $ 27.55    
Weighted Average Exercise Price Per Share, Exercised $ 24.77    
Weighted Average Exercise Price Per Share, Forfeited $ 29.33    
Weighted Average Exercise Price Per Share, Outstanding, end of year $ 26.39   $ 26.39
Weighted Average Exercise Price Per Share, Exercisable, end of year $ 26.28    
Weighted Average Remaining Contractual Term, Outstanding, 5 years 6 months   6 years 1 month 6 days
Weighted Average Remaining Contractual Term, Granted in Period 9 years 2 months 12 days    
Weighted Average Remaining Contractual Term, Exercised During Period 4 years 2 months 12 days    
Weighted Average Remaining Contractual Term, Forfeited During Period 4 years 8 months 12 days    
Weighted Average Remaining Contractual Term, Outstanding, 5 years 6 months   6 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 9 months 18 days    
Aggregate Intrinsic Value, Outstanding, $ 256    
Aggregate Intrinsic Value, Outstanding, end of year 527   256
Aggregate Intrinsic Value, Exercisable, end of year 472    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 12 months    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 40    
Share Price $ 28.95 $ 27.45 $ 27.05
Proceeds from Stock Options Exercised 320 99  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 527   $ 256