Note 5. Earnings Per Common Share (Detail) - Weighted Average Common Shares (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income (in Dollars)	$ 2,524	$ 33,317	$ 15,096	$ 76,674
Preferred stock dividends (in Dollars)	(138)	(138)	(276)	(276)
Net income applicable to common shares for basic and diluted earnings per share (in Dollars)	$ 2,386	$ 33,179	$ 14,820	$ 76,398
Basic weighted average common shares	285,312	279,347	285,303	278,901
Dilutive stock options and restricted stock	9,848	16,409	10,797	17,119
Diluted weighted average common shares	295,160	295,756	296,100	296,020
Net income applicable to common shares (in Dollars per share)	$ 0.01	$ 0.12	$ 0.05	$ 0.27
Net income applicable to common shares (in Dollars per share)	$ 0.01	$ 0.11	$ 0.05	$ 0.26