Note 5. Earnings Per Common Share (Detail) - Weighted Average Common Shares (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income	$ 33,317	$ 17,084	$ 76,674	$ 38,928
Preferred stock dividends	(138)	(3,409)	(276)	(6,817)
Net income applicable to common shares for basic and diluted earnings per share	33,179	13,675	76,398	32,111
Basic weighted average common shares (in Shares)	279,347	248,549	278,901	245,371
Dilutive stock options and restricted stock	$ 16,409	$ 17,825	$ 17,119	$ 18,497
Diluted weighted average common shares (in Shares)	295,756	266,374	296,020	263,868
Net income applicable to common shares (in Dollars per share)	$ 0.12	$ 0.06	$ 0.27	$ 0.13
Net income applicable to common shares (in Dollars per share)	$ 0.11	$ 0.05	$ 0.26	$ 0.12