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Note 2 - Investment Securities - Securities Available For Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available for sale, Amortized Cost | $ 155,770 | $ 166,450
Securities available for sale, Unrealized Gains | 3,030 | 2,345
Securities available for sale, Unrealized Losses | (946) | (3,216)
Securities available for sale | 157,854 | 165,579
US Treasury Securities [Member] |  |
Securities available for sale, Amortized Cost | 16,993 |
Securities available for sale, Unrealized Gains |  |
Securities available for sale, Unrealized Losses | (13) |
Securities available for sale | 16,980 |
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, Amortized Cost | 1,283 | 1,342
Securities available for sale, Unrealized Gains | 17 | 3
Securities available for sale, Unrealized Losses |  |
Securities available for sale | 1,300 | 1,345
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, Amortized Cost | 104,089 | 111,659
Securities available for sale, Unrealized Gains | 2,918 | 2,258
Securities available for sale, Unrealized Losses | (98) | (586)
Securities available for sale | 106,909 | 113,331
Single Issue Trust Preferred Securities [Member] |  |
Securities available for sale, Amortized Cost | 9,360 | 22,104
Securities available for sale, Unrealized Gains |  |
Securities available for sale, Unrealized Losses | (417) | (2,165)
Securities available for sale | 8,943 | 19,939
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, Amortized Cost | 23,990 | 31,290
Securities available for sale, Unrealized Gains | 77 | 66
Securities available for sale, Unrealized Losses | (418) | (465)
Securities available for sale | 23,649 | 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 | $ 73 | $ 73

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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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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