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Note 3 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities held-to-maturity, amortized cost	$ 127,164	$ 134,957
Securities held-to-maturity, gross unrealized gains	3,122	3,817
Securities held-to-maturity, gross unrealized losses	173	1,082
Securities held-to-maturity, fair value	130,113	137,692
US Government Agencies Debt Securities [Member]
Securities held-to-maturity, amortized cost	3,934	3,934
Securities held-to-maturity, gross unrealized gains	167	201
Securities held-to-maturity, gross unrealized losses	0	0
Securities held-to-maturity, fair value	4,101	4,135
US States and Political Subdivisions Debt Securities [Member]
Securities held-to-maturity, amortized cost	122,039	129,783
Securities held-to-maturity, gross unrealized gains	2,929	3,579
Securities held-to-maturity, gross unrealized losses	173	1,082
Securities held-to-maturity, fair value	124,795	132,280
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	209	265
Securities held-to-maturity, gross unrealized gains	21	30
Securities held-to-maturity, gross unrealized losses	0	0
Securities held-to-maturity, fair value	230	295
Corporate Debt Securities [Member]
Securities held-to-maturity, amortized cost	982	975
Securities held-to-maturity, gross unrealized gains	5	7
Securities held-to-maturity, gross unrealized losses	0	0
Securities held-to-maturity, fair value	$ 987	$ 982

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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

+ References

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Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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