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Note 4 - Debt and Equity Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities held-to-maturity, amortized cost, due in one year or less	$ 2,585
Securities held-to-maturity, fair value, due in one year or less	2,585
Securities held-to-maturity, amortized cost, due after ten years	21,866
Securities held-to-maturity, fair value, due after ten years	20,192
Securities held-to-maturity	32,434	$ 37,735
Securities held-to-maturity, fair value	30,593	35,408
Securities available for sale, amortized cost, due in one year or less	0
Securities available for sale, fair value, due in one year or less	0
Securities available for sale, amortized cost, due after one year through five years	1,751
Securities available for sale, fair value, due after one year through five years	1,762
Securities available for sale, amortized cost, due after five years through ten years	123,872
Securities available for sale, fair value, due after five years through ten years	120,810
Securities available for sale, amortized cost, due after ten years	173,806
Securities available for sale, fair value, due after ten years	173,558
Securities available for sale, amortized cost	841,336	868,009
Securities available for sale, fair value	837,705	861,381
Securities available for sale, amortized cost, total other securities	320,992
Securities available for sale, fair value, total other securities	317,693
Other Debt Obligations [Member]
Securities held-to-maturity	24,451	37,735
Securities held-to-maturity, fair value	22,777	35,408
Securities available for sale, fair value	317,693	344,905
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity	7,983
Securities held-to-maturity, fair value	7,816
Securities available for sale, amortized cost	520,344	518,826
Securities available for sale, fair value	520,012	516,476
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost	21,563	21,366
Securities available for sale, fair value	21,563	$ 21,366
Commercial Mortgage Backed Securities [Member]
Securities available for sale, amortized cost	520,344
Securities available for sale, fair value	$ 520,012

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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