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Earnings Per Common Share And Stock Options (Summary Of Share-Based Award Transactions) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Common Share And Stock Options [Abstract]      
Number Of Shares, Outstanding Beginning Balance 101,600 110,800  
Number Of Shares, SARs granted 3,000 3,000  
Number Of Shares, Options exercised (6,380) (7,700)  
Number Of Shares, Options/SARs cancelled/forfeited/expired (70) (4,500)  
Number Of Shares, Outstanding Ending Balance 98,150 101,600 110,800
Number Of Shares, Exercisable as of December 31, 2012 97,150    
Number Of Shares, Unvested as of December 31, 2012 1,000    
Weighted Average Exercise Price, Outstanding Beginning Balance $ 29.81 $ 28.77  
Weighted Average Exercise Price, SARs granted $ 50.50 $ 41.50  
Weighted Average Exercise Price, Options exercised $ 25.17 $ 20.15  
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired $ 31.00 $ 28.61  
Weighted Average Exercise Price, Outstanding Ending Balance $ 30.74 $ 29.81 $ 28.77
Weighted Average Exercise Price, Exercisable as of December 31, 2012 $ 30.59    
Weighted Average Exercise Price, Unvested as of December 31, 2012 $ 45.64    
Average Remaining Contractual Term, Outstanding Beginning Balance 3 years 2 months 1 day 3 years 10 months 28 days 4 years 6 months 4 days
Average Remaining Contractual Term, Outstanding Ending Balance 3 years 2 months 1 day 3 years 10 months 28 days 4 years 6 months 4 days
Average Remaining Contractual Term, Exercisable as of December 31, 2012 3 years 1 month 24 days    
Average Remaining Contractual Term, Unvested as of December 31, 2012 5 years 2 months 12 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 697,780 $ 353,955  
Aggregate Intrinsic Value, Outstanding Ending Balance 2,871,710 697,780 353,955
Aggregate Intrinsic Value, Exercisable as of December 31, 2012 2,857,350    
Aggregate Intrinsic Value, Unvested as of December 31, 2012 $ 14,360