Earnings Per Common Share (Summary Of Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Income available to common shareholders	$ 21,827	$ 20,034	$ 41,446	$ 40,744
Denominator for basic earnings per share (weighted average common shares outstanding)	15,392,435	15,411,981	15,396,770	15,411,986
Effect of dilutive options and warrants	19,732	0	16,798	0
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	15,412,167	15,411,981	15,413,568	15,411,986
Basic earnings per common share	$ 1.42	$ 1.30	$ 2.69	$ 2.64
Diluted earnings per common share	$ 1.42	$ 1.30	$ 2.69	$ 2.64