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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Income available to common shareholders $ 30,846 $ 31,146 $ 82,723 $ 78,764
Denominator for basic earnings per share (weighted average common shares outstanding) 16,300,720 16,382,798 16,300,250 16,198,294
Effect of dilutive options and warrants 93,072 92,943 98,100 89,401
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants) 16,393,792 16,475,741 16,398,350 16,287,695
Basic earnings per common share $ 1.89 $ 1.90 $ 5.07 $ 4.86
Diluted earnings per common share $ 1.88 $ 1.89 $ 5.04 $ 4.84