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Stock-Based Compensation (Summary of Stock Option Activity) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 26, 2006
Stock-Based Compensation [Abstract]        
Options, Outstanding, beginning of year 225,670 229,836 207,534  
Options, Granted 28,600 30,250 31,900  
Options, Exercised (24,127) (20,435) (2,833)  
Options, Forfeited (10,603) (13,981) (6,765)  
Options, Outstanding, end of year 219,540 225,670 229,836  
Options, Exercisable, end of year 190,940 196,489 199,005  
Weighted Average Exercise Price Per Share, Outstanding, beginning of year $ 26.27 $ 25.85 $ 25.93  
Weighted Average Exercise Price Per Share, Granted $ 27.07 $ 27.05 $ 24.94  
Weighted Average Exercise Price Per Share, Exercised $ 23.83 $ 22.19 $ 17.90  
Weighted Average Exercise Price Per Share, Forfeited $ 28.92 $ 26.88 $ 27.50  
Weighted Average Exercise Price Per Share, Outstanding, end of year $ 26.64 $ 26.27 $ 25.85  
Weighted Average Exercise Price Per Share, Exercisable, end of year $ 26.58 $ 26.15 $ 25.99  
Weighted Average Remaining Contractual Term, Outstanding, 4 years 9 months 18 days      
Weighted Average Remaining Contractual Term, Outstanding, 4 years 9 months 18 days      
Aggregate Intrinsic Value, Outstanding, $ 256,499 $ 113,352    
Aggregate Intrinsic Value, Outstanding, end of year 146,970 256,499 113,352  
Aggregate Intrinsic Value, Exercisable, end of year 146,900 256,499 112,152  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       275,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 157,000 154,000 130,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 146,970 $ 256,499 $ 113,352