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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Income available to common shareholders $ 31,584 $ 34,324 $ 65,317 $ 73,199
Denominator for basic earnings per share (weighted average common shares outstanding) 16,165,119 16,249,307 16,203,736 16,234,598
Effect of dilutive options and warrants 75,481 111,939 78,957 111,543
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants) 16,240,600 16,361,246 16,282,693 16,346,141
Basic earnings per common share $ 1.95 $ 2.11 $ 4.03 $ 4.51
Diluted earnings per common share $ 1.94 $ 2.10 $ 4.01 $ 4.48