Note 5 - Earnings Per Common Share (Details) - Weighted Average Common Shares (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net income	$ 12,552	$ 11,641
Preferred stock dividends	(138)	(138)
Net income applicable to common shares for basic and diluted earnings per share	$ 12,414	$ 11,503
Denominator
Basic weighted average common shares	368,789	342,666
Dilutive stock options and restricted stock	902	7,352
Diluted weighted average common shares	369,691	350,018
Basic earnings per common share
Net income applicable to common shares	$ 0.03	$ 0.03
Diluted earnings per common share
Net income applicable to common shares	$ 0.03	$ 0.03