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Note 4 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, less than 12 months, fair value	$ 39,644	$ 66,069
Available-for-sale, less than 12 months, unrealized losses	(865)	(650)
Available-for-sale, 12 months or more, fair value	88,761	67,434
Available-for-sale, 12 months or more, unrealized losses	(3,168)	(1,447)
Held-to-maturity, less than 12 months, fair value	5,666	9,331
Held-to-maturity, less than 12 months, unrealized losses	(146)	(68)
Held-to-maturity, 12 months or more, fair value	15,813	14,594
Held-to-maturity, 12 months or more, unrealized losses	(613)	(275)
Residential Mortgage Backed Securities [Member]
Available-for-sale, less than 12 months, fair value	28,238	47,007
Available-for-sale, less than 12 months, unrealized losses	(591)	(467)
Available-for-sale, 12 months or more, fair value	39,667	21,122
Available-for-sale, 12 months or more, unrealized losses	(1,305)	(393)
Commercial Mortgage Backed Securities [Member]
Available-for-sale, less than 12 months, fair value	9,681	18,554
Available-for-sale, less than 12 months, unrealized losses	(252)	(180)
Available-for-sale, 12 months or more, fair value	47,607	46,312
Available-for-sale, 12 months or more, unrealized losses	(1,839)	(1,054)
Held-to-maturity, less than 12 months, fair value	3,797	7,895
Held-to-maturity, less than 12 months, unrealized losses	(111)	(63)
Held-to-maturity, 12 months or more, fair value	8,152	6,675
Held-to-maturity, 12 months or more, unrealized losses	(297)	(123)
US Government Agencies Debt Securities [Member]
Held-to-maturity, less than 12 months, fair value	660	865
Held-to-maturity, less than 12 months, unrealized losses	(14)	(2)
Held-to-maturity, 12 months or more, fair value	7,143	7,388
Held-to-maturity, 12 months or more, unrealized losses	(310)	(142)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, less than 12 months, fair value	1,645	428
Available-for-sale, less than 12 months, unrealized losses	(22)	(3)
Available-for-sale, 12 months or more, fair value	1,487
Available-for-sale, 12 months or more, unrealized losses	(24)
Held-to-maturity, less than 12 months, fair value	1,209	571
Held-to-maturity, less than 12 months, unrealized losses	(21)	(3)
Held-to-maturity, 12 months or more, fair value	518	531
Held-to-maturity, 12 months or more, unrealized losses	(6)	(10)
US Treasury Securities [Member]
Available-for-sale, less than 12 months, fair value	80	80
Available-for-sale, less than 12 months, unrealized losses
Available-for-sale, 12 months or more, fair value
Available-for-sale, 12 months or more, unrealized losses

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

No definition available.

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+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

+ References

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-Topic 320
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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.

+ References

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