Shareholders' Equity And Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income	$ 30,202	$ 20,098	$ 58,354	$ 49,125
Less: Preferred stock dividends and discount accretion	1,032	4,943	3,096	14,830
Net income applicable to common shares	29,170	15,155	55,258	34,295
Add: Dividends on convertible preferred stock	1,000
Weighted average common shares outstanding	35,550	31,117	35,152	29,396
Effect of dilutive potential common shares	10,551	988	8,683	1,132
Weighted average common shares and effect of dilutive potential common shares	46,101	32,105	43,835	30,528
Net income per common share - Basic	$ 0.82	$ 0.49	$ 1.57	$ 1.17
Net income per common share - Diluted	$ 0.65	$ 0.47	$ 1.26	$ 1.12
Earnings Per Share, Basic [Member]
Net income applicable to common shares	29,170	15,155	55,258	34,295
Earnings Per Share, Diluted [Member]
Net income applicable to common shares	$ 30,170	$ 15,155	$ 55,258	$ 34,295