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, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Income available to common shareholders	$ 33,733	$ 38,875
Denominator for basic earnings per share (weighted average common shares outstanding)	16,242,353	16,219,889
Effect of dilutive options and warrants	82,470	111,142
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	16,324,823	16,331,031
Basic earnings per common share	$ 2.08	$ 2.40
Diluted earnings per common share	$ 2.07	$ 2.38