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Note 2 - Investment Securities - Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities held to maturity, amortized cost	$ 25,182	$ 47,133	[1]
Securities held to maturity, unrealized gains	44	135
Securities held to maturity, unrealized losses	0	(2)
Securities held to maturity, fair value	25,226	47,266
US Government Agencies Debt Securities [Member]
Securities held to maturity, amortized cost	17,949	36,741
Securities held to maturity, unrealized gains	31	124
Securities held to maturity, unrealized losses
Securities held to maturity, fair value	17,980	36,865
Corporate Debt Securities [Member]
Securities held to maturity, amortized cost	7,233	10,392
Securities held to maturity, unrealized gains	13	11
Securities held to maturity, unrealized losses		(2)
Securities held to maturity, fair value	$ 7,246	$ 10,401
[1] Derived from audited financial statements

X

- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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