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Note 4 - Investment Securities Available-for-Sale (Details) - Securities Available-for-sale by Contractual Maturity (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
U. S. Government agency securities maturing:
Amortized Cost	$ 379,947	$ 383,665
Estimated Fair Value	382,468	378,133
US Government Agencies Debt Securities [Member]
U. S. Government agency securities maturing:
Amortized Cost	3,000	19,025
Estimated Fair Value	2,981	19,133
Amortized Cost	29,152	27,615
Estimated Fair Value	29,565	28,202
Amortized Cost	6,484
Estimated Fair Value	6,538
Residential Mortgage Backed Securities [Member]
U. S. Government agency securities maturing:
Amortized Cost	227,525	234,206
Estimated Fair Value	225,129	228,674
Municipal Bond [Member]
U. S. Government agency securities maturing:
Amortized Cost	2,846	25,718
Estimated Fair Value	2,876	26,008
Amortized Cost	46,404
Estimated Fair Value	48,757
Amortized Cost	62,682	76,705
Estimated Fair Value	64,649	75,732
Ten years through fifteen years	1,458
Ten years through fifteen years	1,574
Equity Investment Other [Member]
U. S. Government agency securities maturing:
Amortized Cost	396	396
Estimated Fair Value	$ 399	$ 384

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Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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