Note 11 - Earnings Per Common Share (Details) - Earnings per common share and diluted earnings per common share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings per common share and diluted earnings per common share [Abstract]
Net income applicable to common equity (numerator) (in Dollars)	$ 17,112	$ 20,964	$ 34,383	$ 41,969
Weighted average number of common shares outstanding - basic	26,890	27,744	27,017	27,897
Add exercise of options reduced by the number of shares that could have been purchased with the proceeds of such exercise	8	46	10	54
Weighted average number of common shares outstanding - diluted (denominator)	26,898	27,790	27,027	27,951
Diluted earnings per common share (in Dollars per share)	$ 0.64	$ 0.75	$ 1.27	$ 1.50
Basic earnings per common share (in Dollars per share)	$ 0.64	$ 0.76	$ 1.27	$ 1.50