Shareholders' Equity And Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income	$ 11,750	$ 13,009	$ 28,152	$ 29,027
Less: Preferred stock dividends and discount accretion	1,033	4,943	2,064	9,887
Net income applicable to common shares	10,717	8,066	26,088	19,140
Weighted average common shares outstanding	34,971	31,074	34,950	28,522
Effect of dilutive potential common shares	8,438	1,267	8,437	1,203
Weighted average common shares and effect of dilutive potential common shares	43,409	32,341	43,387	29,725
Net income per common share - Basic	$ 0.31	$ 0.26	$ 0.75	$ 0.67
Net income per common share - Diluted	$ 0.25	$ 0.25	$ 0.60	$ 0.64
Earnings Per Share, Basic [Member]
Net income applicable to common shares	10,717	8,066	26,088	19,140
Earnings Per Share, Diluted [Member]
Net income applicable to common shares	$ 10,717	$ 8,066	$ 26,088	$ 19,140