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Earnings Per Common Share (Summary Of Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Income available to common shareholders $ 38,875 $ 42,831
Denominator for basic earnings per share (weighted average common shares outstanding) 16,219,889 16,314,987
Effect of dilutive options and warrants 111,142 124,933
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants) 16,331,031 16,439,920
Basic earnings per common share $ 2.40 $ 2.63
Diluted earnings per common share $ 2.38 $ 2.61