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, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Income available to common shareholders	$ 22,372	$ 25,455
Denominator for basic earnings per share (weighted average common shares outstanding)	16,303,602	15,651,541
Effect of dilutive options and warrants	122,279	93,236
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	16,425,881	15,744,777
Basic earnings per common share	$ 1.37	$ 1.63
Diluted earnings per common share	$ 1.36	$ 1.62