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Note 2 - Investment Securities - Securities Available For Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available for sale, amortized cost | $ 172,510 | $ 166,450 |
Securities available for sale, unrealized gains | 2,759 | 2,345 |
Securities available for sale, unrealized losses | (845) | (3,216) |
Securities available for sale, fair value | 174,424 | 165,579 | [1]
US Treasury Securities [Member] |  |  |
Securities available for sale, amortized cost | 36,973 |  |
Securities available for sale, unrealized gains |  |  |
Securities available for sale, unrealized losses | (9) |  |
Securities available for sale, fair value | 36,964 |  |
US Government Agencies Debt Securities [Member] |  |  |
Securities available for sale, amortized cost | 1,254 | 1,342 |
Securities available for sale, unrealized gains | 21 | 3 |
Securities available for sale, unrealized losses |  |  |
Securities available for sale, fair value | 1,275 | 1,345 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities available for sale, amortized cost | 102,347 | 111,659 |
Securities available for sale, unrealized gains | 2,648 | 2,258 |
Securities available for sale, unrealized losses | (88) | (586) |
Securities available for sale, fair value | 104,907 | 113,331 |
Single Issue Trust Preferred Securities [Member] |  |  |
Securities available for sale, amortized cost | 9,363 | 22,104 |
Securities available for sale, unrealized gains |  |  |
Securities available for sale, unrealized losses | (401) | (2,165) |
Securities available for sale, fair value | 8,962 | 19,939 |
Mortgage-backed Agency Securities [Member] |  |  |
Securities available for sale, amortized cost | 22,518 | 31,290 |
Securities available for sale, unrealized gains | 72 | 66 |
Securities available for sale, unrealized losses | (347) | (465) |
Securities available for sale, fair value | 22,243 | 30,891 |
Equity Securities [Member] |  |  |
Securities available for sale, amortized cost | 55 | 55 |
Securities available for sale, unrealized gains | 18 | 18 |
Securities available for sale, unrealized losses |  |  |
Securities available for sale, fair value | $ 73 | $ 73 |
[1] | Derived from audited financial statements

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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