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Note 2 - Investment Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 54,282 | $ 37,086
Securities available for sale, less than 12 months, unrealized losses | (120) | (693)
Securities available for sale, 12 months or longer, fair value | 18,670 | 32,505
Securities available for sale, 12 months or longer, unrealized losses | (725) | (2,523)
Securities available for sale, total fair value | 72,952 | 69,591
Securities available for sale, total unrealized losses | (845) | (3,216)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 36,963 |
Securities available for sale, less than 12 months, unrealized losses | (9) |
Securities available for sale, 12 months or longer, fair value |  |
Securities available for sale, 12 months or longer, unrealized losses |  |
Securities available for sale, total fair value | 36,963 |
Securities available for sale, total unrealized losses | (9) |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 9,421 | 24,252
Securities available for sale, less than 12 months, unrealized losses | (52) | (527)
Securities available for sale, 12 months or longer, fair value | 1,427 | 715
Securities available for sale, 12 months or longer, unrealized losses | (36) | (59)
Securities available for sale, total fair value | 10,848 | 24,967
Securities available for sale, total unrealized losses | (88) | (586)
Single Issue Trust Preferred Securities [Member] |  |
Securities available for sale, less than 12 months, fair value |  |
Securities available for sale, less than 12 months, unrealized losses |  |
Securities available for sale, 12 months or longer, fair value | 8,962 | 19,939
Securities available for sale, 12 months or longer, unrealized losses | (401) | (2,165)
Securities available for sale, total fair value | 8,962 | 19,939
Securities available for sale, total unrealized losses | (401) | (2,165)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 7,898 | 12,834
Securities available for sale, less than 12 months, unrealized losses | (59) | (166)
Securities available for sale, 12 months or longer, fair value | 8,281 | 11,851
Securities available for sale, 12 months or longer, unrealized losses | (288) | (299)
Securities available for sale, total fair value | 16,179 | 24,685
Securities available for sale, total unrealized losses | $ (347) | $ (465)

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- 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 less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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