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Earnings Per Common Share And Share Awards (Summary Of Share-Based Award Transactions) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number Of Shares, Outstanding Beginning Balance 98,150 101,600  
Number Of Shares, SARs granted 0 3,000  
Number Of Shares, Options exercised (1,400) (6,380)  
Number Of Shares, Options/SARs cancelled/forfeited/expired 0 (70)  
Number Of Shares, Outstanding Ending Balance 93,750 98,150 101,600
Number Of Shares, Exercisable as of March 31, 2013 93,500    
Number Of Shares, Unvested as of March 31, 2013 250    
Weighted Average Exercise Price, Outstanding Beginning Balance $ 30.74 $ 29.81  
Weighted Average Exercise Price, SARs granted $ 0.00 $ 50.50  
Weighted Average Exercise Price, Options exercised $ 30.59 $ 25.17  
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired $ 0.00 $ 31.00  
Weighted Average Exercise Price, Outstanding Ending Balance $ 30.41 $ 30.74 $ 29.81
Weighted Average Exercise Price, Exercisable as of March 31, 2013 $ 30.41    
Weighted Average Exercise Price, Unvested as of March 31, 2013 $ 31.06    
Average Remaining Contractual Term, Outstanding Beginning Balance 2 years 11 months 19 days 3 years 2 months 1 day 3 years 10 months 28 days
Average Remaining Contractual Term, Outstanding Ending Balance 2 years 11 months 19 days 3 years 2 months 1 day 3 years 10 months 28 days
Average Remaining Contractual Term, Exercisable as of March 31, 2013 2 years 11 months 19 days    
Average Remaining Contractual Term, Unvested as of March 31, 2013 1 year 5 months 9 days    
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 2,871,710 $ 697,780  
Aggregate Intrinsic Value, Outstanding Ending Balance 3,624,608 2,871,710 697,780
Aggregate Intrinsic Value, Exercisable as of March 31, 2013 3,615,105    
Aggregate Intrinsic Value, Unvested as of March 31, 2013 $ 9,503    
SARs [Member]
      
Number Of Shares, Options exercised (3,000) 0  
Weighted Average Exercise Price, Options exercised $ 41.25 $ 0.00