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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-Sale, Amortized Cost	$ 184,278	$ 197,995
Available-for-Sale, Gross Unrealized Gains	936	2,093
Available-for-Sale, Gross Unrealized Losses	(3,304)	(1,245)
Available-for-Sale, Estimated Fair Value	181,910	198,843
Held-to-Maturity, Amortized Cost	25,904	32,359
Held-to-Maturity, Gross Unrealized Gains	20	70
Held-to-Maturity, Gross Unrealized Losses	(416)	(245)
Held-to-Maturity, Estimated Fair Value	25,508	32,184
Residential Mortgage Backed Securities [Member]
Available-for-Sale, Amortized Cost	99,922	135,104
Available-for-Sale, Gross Unrealized Gains	490	998
Available-for-Sale, Gross Unrealized Losses	(2,003)	(608)
Available-for-Sale, Estimated Fair Value	98,409	135,494
Commercial Mortgage Backed Securities [Member]
Available-for-Sale, Amortized Cost	71,761	45,961
Available-for-Sale, Gross Unrealized Gains	56	164
Available-for-Sale, Gross Unrealized Losses	(1,287)	(616)
Available-for-Sale, Estimated Fair Value	70,530	45,509
Held-to-Maturity, Amortized Cost	14,684	16,321
Held-to-Maturity, Gross Unrealized Gains	5	33
Held-to-Maturity, Gross Unrealized Losses	(148)	(170)
Held-to-Maturity, Estimated Fair Value	14,541	16,184
US Government Agencies Debt Securities [Member]
Available-for-Sale, Amortized Cost	2,000	1,999
Available-for-Sale, Gross Unrealized Gains
Available-for-Sale, Gross Unrealized Losses	(7)	(17)
Available-for-Sale, Estimated Fair Value	1,993	1,982
Held-to-Maturity, Amortized Cost	9,129	13,766
Held-to-Maturity, Gross Unrealized Gains	13	19
Held-to-Maturity, Gross Unrealized Losses	(222)	(71)
Held-to-Maturity, Estimated Fair Value	8,920	13,714
US States and Political Subdivisions Debt Securities [Member]
Available-for-Sale, Amortized Cost	9,759	14,071
Available-for-Sale, Gross Unrealized Gains	390	931
Available-for-Sale, Gross Unrealized Losses	(7)	(4)
Available-for-Sale, Estimated Fair Value	10,142	14,998
Held-to-Maturity, Amortized Cost	2,091	2,272
Held-to-Maturity, Gross Unrealized Gains	2	18
Held-to-Maturity, Gross Unrealized Losses	(46)	(4)
Held-to-Maturity, Estimated Fair Value	2,047	2,286
Corporate Debt Securities [Member]
Available-for-Sale, Amortized Cost	756	780
Available-for-Sale, Gross Unrealized Gains
Available-for-Sale, Gross Unrealized Losses
Available-for-Sale, Estimated Fair Value	756	780
US Treasury Securities [Member]
Available-for-Sale, Amortized Cost	80	80
Available-for-Sale, Gross Unrealized Gains
Available-for-Sale, Gross Unrealized Losses
Available-for-Sale, Estimated Fair Value	$ 80	$ 80

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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