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Note 6 - Debt and Equity Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities held-to-maturity, amortized cost, due in one year or less	$ 1,045
Securities held-to-maturity, fair value, due in one year or less	1,045
Securities held-to-maturity, amortized cost, due after ten years	21,868
Securities held-to-maturity, fair value, due after ten years	20,844
Securities held-to-maturity	30,886	$ 37,735
Securities held-to-maturity, fair value	29,699	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	4,306
Securities available for sale, fair value, due after one year through five years	4,317
Securities available for sale, amortized cost, due after five years through ten years	129,931
Securities available for sale, fair value, due after five years through ten years	122,809
Securities available for sale, amortized cost, due after ten years	88,553
Securities available for sale, fair value, due after ten years	90,003
Securities available for sale, amortized cost, total other securities	222,790
Securities available for sale, fair value, total other securities	217,129
Securities available for sale, amortized cost	748,350	868,009
Securities available for sale	738,354	861,381
Other Debt Obligations [Member]
Securities held-to-maturity	22,913	37,735
Securities held-to-maturity, fair value	21,889	35,408
Securities available for sale	228,704	344,905
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity	7,973
Securities held-to-maturity, fair value	7,810
Securities available for sale, amortized cost	513,985	518,826
Securities available for sale	509,650	516,476
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost	11,575	21,366
Securities available for sale	11,575	$ 21,366
Commercial Mortgage Backed Securities [Member]
Securities available for sale, amortized cost	513,985
Securities available for sale	$ 509,650

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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