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, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Income available to common shareholders	$ 25,455	$ 31,123
Denominator for basic earnings per share (weighted average common shares outstanding)	15,651,541	15,288,332
Effect of dilutive options and warrants	93,236	142,996
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	15,744,777	15,431,328
Basic earnings per common share	$ 1.63	$ 2.04
Diluted earnings per common share	$ 1.62	$ 2.02