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, 2013	Mar. 31, 2012
Net income (in Dollars)	$ 11,094	$ 12,572
Preferred stock dividends (in Dollars)	(138)	(138)
Net income applicable to common shares for basic and diluted earnings per share (in Dollars)	$ 10,956	$ 12,434
Denominator
Basic weighted average common shares	285,171	285,292
Dilutive stock options and restricted stock	11,993	11,636
Diluted weighted average common shares	297,164	296,928
Basic earnings per common share
Net income applicable to common shares (in Dollars per share)	$ 0.04	$ 0.04
Diluted earnings per common share
Net income applicable to common shares (in Dollars per share)	$ 0.04	$ 0.04