Note 5. Earnings Per Common Share (Detail) - Weighted Average Common Shares (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	$ 55,921	$ 19,791	$ 132,595	$ 58,719
Preferred stock dividends	(138)	(3,408)	(414)	(10,225)
Net income applicable to common shares for basic and diluted earnings per share	55,783	16,383	132,181	48,494
Basic weighted average common shares (in Shares)	279,541	256,095	279,067	249,039
Dilutive stock options and restricted stock	$ 15,459	$ 14,413	$ 16,672	$ 17,106
Diluted weighted average common shares (in Shares)	295,000	270,508	295,739	266,145
Net income applicable to common shares (in Dollars per share)	$ 0.20	$ 0.06	$ 0.47	$ 0.19
Net income applicable to common shares (in Dollars per share)	$ 0.19	$ 0.06	$ 0.45	$ 0.18