Note 11 - Earnings Per Common Share (Detail) - Earnings per common share and diluted earnings per common share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income applicable to common equity (numerator) (in Dollars)	$ 17,271	$ 21,005
Weighted average number of common shares outstanding - basic	27,145	28,051
Add exercise of options reduced by the number of shares that could have been purchased with the proceeds of such exercise	12	60
Weighted average number of common shares outstanding - diluted (denominator)	27,157	28,111
Diluted earnings per common share (in Dollars per share)	$ 0.64	$ 0.75
Basic earnings per common share (in Dollars per share)	$ 0.64	$ 0.75