Note 5. Earnings Per Common Share (Detail) - Weighted Average Common Shares (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income (in Dollars)	$ 12,572	$ 43,357
Preferred stock dividends (in Dollars)	(138)	(138)
Net income applicable to common shares for basic and diluted earnings per share (in Dollars)	$ 12,434	$ 43,219
Basic weighted average common shares	285,292	278,448
Dilutive stock options and restricted stock	11,636	17,796
Diluted weighted average common shares	296,928	296,244
Net income applicable to common shares (in Dollars per share)	$ 0.04	$ 0.16
Net income applicable to common shares (in Dollars per share)	$ 0.04	$ 0.15