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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Income available to common shareholders	$ 19,029	$ 11,982	$ 59,773	$ 58,918
Denominator for basic earnings per share (weighted average common shares outstanding)	15,411,972	15,405,894	15,411,981	15,405,902
Effect of dilutive options and warrants	0	0	0	3,284
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	15,411,972	15,405,894	15,411,981	15,409,186
Basic earnings per common share	$ 1.23	$ 0.78	$ 3.88	$ 3.82
Diluted earnings per common share	$ 1.23	$ 0.78	$ 3.88	$ 3.82