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Note 4 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held-to-maturity, Amortized Costs | $ 130,712 | $ 134,957
Securities held-to-maturity, Gross Unrealized Gains | 4,640 | 3,817
Securities held-to-maturity, Gross Unrealized Losses | 55 | 1,082
Securities held-to-maturity, Fair Values | 135,297 | 137,692
US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 3,934 | 3,934
Securities held-to-maturity, Gross Unrealized Gains | 243 | 201
Securities held-to-maturity, Gross Unrealized Losses | 0 | 0
Securities held-to-maturity, Fair Values | 4,177 | 4,135
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 125,563 | 129,783
Securities held-to-maturity, Gross Unrealized Gains | 4,356 | 3,579
Securities held-to-maturity, Gross Unrealized Losses | 55 | 1,082
Securities held-to-maturity, Fair Values | 129,864 | 132,280
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 236 | 265
Securities held-to-maturity, Gross Unrealized Gains | 26 | 30
Securities held-to-maturity, Gross Unrealized Losses | 0 | 0
Securities held-to-maturity, Fair Values | 262 | 295
Corporate Debt Securities [Member] |  |
Securities held-to-maturity, Amortized Costs | 979 | 975
Securities held-to-maturity, Gross Unrealized Gains | 15 | 7
Securities held-to-maturity, Gross Unrealized Losses | 0 | 0
Securities held-to-maturity, Fair Values | $ 994 | $ 982

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- 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 + Details
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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 + Details
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- Definition 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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