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Note 3 - Investment Securities Available for Sale (Details) - The Amortized Cost And Estimated Fair Value Of Investments Available For Sale (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
U. S. Government agency securities maturing:
Amortized Cost	$ 383,665	$ 290,712
Estimated Fair Value	378,133	299,820
US Government Agencies Debt Securities [Member]
U. S. Government agency securities maturing:
One year or less	19,025	5,038
One year or less	19,133	5,053
Amortized Cost	27,615	42,568
Estimated Fair Value	28,202	44,029
Residential Mortgage Backed Securities [Member]
U. S. Government agency securities maturing:
Amortized Cost	234,206	170,649
Estimated Fair Value	228,674	173,083
Municipal Bond [Member]
U. S. Government agency securities maturing:
Amortized Cost	25,718	11,469
Estimated Fair Value	26,008	11,978
Five years through ten years	76,705	60,581
Five years through ten years	75,732	65,335
Equity Investment Other [Member]
U. S. Government agency securities maturing:
Amortized Cost	396	407
Estimated Fair Value	$ 384	$ 342

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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