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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale, less than 12 months, fair value	$ 77,546	$ 66,069
Available-for-sale, less than 12 months, unrealized losses	(1,610)	(650)
Available-for-sale, 12 months or more, fair value	65,861	67,434
Available-for-sale, 12 months or more, unrealized losses	(2,244)	(1,447)
Held-to-maturity, less than 12 months, fair value	10,609	9,331
Held-to-maturity, less than 12 months, unrealized losses	(181)	(68)
Held-to-maturity, 12 months or more, fair value	14,078	14,594
Held-to-maturity, 12 months or more, unrealized losses	(432)	(275)
Residential Mortgage Backed Securities [Member]
Available-for-sale, less than 12 months, fair value	56,885	47,007
Available-for-sale, less than 12 months, unrealized losses	(1,209)	(467)
Available-for-sale, 12 months or more, fair value	21,126	21,122
Available-for-sale, 12 months or more, unrealized losses	(774)	(393)
Commercial Mortgage Backed Securities [Member]
Available-for-sale, less than 12 months, fair value	20,155	18,554
Available-for-sale, less than 12 months, unrealized losses	(398)	(180)
Available-for-sale, 12 months or more, fair value	44,735	46,312
Available-for-sale, 12 months or more, unrealized losses	(1,470)	(1,054)
Held-to-maturity, less than 12 months, fair value	7,642	7,895
Held-to-maturity, less than 12 months, unrealized losses	(150)	(63)
Held-to-maturity, 12 months or more, fair value	6,253	6,675
Held-to-maturity, 12 months or more, unrealized losses	(192)	(123)
US Government Agencies Debt Securities [Member]
Held-to-maturity, less than 12 months, fair value	1,656	865
Held-to-maturity, less than 12 months, unrealized losses	(23)	(2)
Held-to-maturity, 12 months or more, fair value	7,298	7,388
Held-to-maturity, 12 months or more, unrealized losses	(232)	(142)
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, less than 12 months, fair value	426	428
Available-for-sale, less than 12 months, unrealized losses	(3)	(3)
Available-for-sale, 12 months or more, fair value
Available-for-sale, 12 months or more, unrealized losses
Held-to-maturity, less than 12 months, fair value	1,311	571
Held-to-maturity, less than 12 months, unrealized losses	(8)	(3)
Held-to-maturity, 12 months or more, fair value	527	531
Held-to-maturity, 12 months or more, unrealized losses	(8)	(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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+ References

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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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