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Note 2 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale securities, amortized cost | $ 343,971 | $ 331,267
Available for sale securities, gross unrealized gains | 413 | 94
Available for sale securities, gross unrealized losses | (6,135) | (7,703)
Available for sale securities, fair value | 338,249 | 323,658
US Government Agencies Debt Securities [Member] |  |
Available for sale securities, amortized cost | 336,376 | 326,694
Available for sale securities, gross unrealized gains | 368 | 76
Available for sale securities, gross unrealized losses | (6,086) | (7,673)
Available for sale securities, fair value | 330,658 | 319,097
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, amortized cost | 4,527 | 4,573
Available for sale securities, gross unrealized gains | 37 | 18
Available for sale securities, gross unrealized losses | (25) | (30)
Available for sale securities, fair value | 4,539 | $ 4,561
Corporate Debt Securities [Member] |  |
Available for sale securities, amortized cost | 2,052 |
Available for sale securities, gross unrealized gains | 8 |
Available for sale securities, gross unrealized losses |  |
Available for sale securities, fair value | 2,060 |
Asset-backed Securities [Member] |  |
Available for sale securities, amortized cost | 1,016 |
Available for sale securities, gross unrealized gains |  |
Available for sale securities, gross unrealized losses | (24) |
Available for sale securities, fair value | $ 992 |

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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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