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Note 4 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale, amortized cost	$ 118,410	$ 135,656
Available-for-sale, gross unrealized gains	488	174
Available-for-sale, gross unrealized losses	(937)	(3,343)
Available-for-sale, estimated fair value	117,961	132,487
Held-to-maturity, amortized cost	18,688	21,462
Held-to-maturity, gross unrealized gains	13
Held-to-maturity, gross unrealized losses	(127)	(610)
Held-to-maturity, estimated fair value	18,574	20,852
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	49,306	56,101
Available-for-sale, gross unrealized gains	46	10
Available-for-sale, gross unrealized losses	(603)	(1,822)
Available-for-sale, estimated fair value	48,749	54,289
Held-to-maturity, amortized cost	10,483	11,716
Held-to-maturity, gross unrealized gains
Held-to-maturity, gross unrealized losses	(86)	(349)
Held-to-maturity, estimated fair value	10,397	11,367
US Government Agencies Debt Securities [Member]
Held-to-maturity, amortized cost	6,548	8,026
Held-to-maturity, gross unrealized gains
Held-to-maturity, gross unrealized losses	(40)	(244)
Held-to-maturity, estimated fair value	6,508	7,782
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	64,271	73,859
Available-for-sale, gross unrealized gains	330	113
Available-for-sale, gross unrealized losses	(334)	(1,517)
Available-for-sale, estimated fair value	64,267	72,455
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	4,754	5,617
Available-for-sale, gross unrealized gains	111	51
Available-for-sale, gross unrealized losses		(4)
Available-for-sale, estimated fair value	4,865	5,664
Held-to-maturity, amortized cost	1,657	1,720
Held-to-maturity, gross unrealized gains	13
Held-to-maturity, gross unrealized losses	(1)	(17)
Held-to-maturity, estimated fair value	1,669	1,703
US Treasury Securities [Member]
Available-for-sale, amortized cost	79	79
Available-for-sale, gross unrealized gains	1
Available-for-sale, gross unrealized losses
Available-for-sale, estimated fair value	$ 80	$ 79

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Section 50
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