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Note 4 - Earnings Per Share (Detail) - Basic and Diluted Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator for basic and diluted earnings per share-
Net income available to common shareholders (in Dollars)	$ 13,547	$ 15,906
Denominator-
Denominator for basic earnings per share, weighted average shares outstanding	39,119	38,387
Employee and Director stock options and restricted share awards	1,150	1,220
Denominator for diluted earnings per share, adjusted weighted average shares and assumed conversions	40,269	39,607
Basic earnings per common share (in Dollars per share)	$ 0.35	$ 0.41
Diluted earnings per common share and common share equivalents (in Dollars per share)	$ 0.34	$ 0.40

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