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Earnings Per Common Share (Summary Of Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Common Share [Abstract]
Income available to common shareholders	$ 16,845	$ 18,125	$ 55,612	$ 57,167
Denominator for basic earnings per share (weighted average common shares outstanding)	15,398,909	15,272,720	15,398,919	15,090,113
Effect of dilutive options and warrants			1,722
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	15,398,909	15,272,720	15,400,641	15,090,113
Basic earnings per common share	$ 1.09	$ 1.19	$ 3.61	$ 3.79
Diluted earnings per common share	$ 1.09	$ 1.19	$ 3.61	$ 3.79

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