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Note 2 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available for sale securities, amortized cost | $ 333,656 | $ 362,465
Available for sale securities, gross unrealized gains | 56 | 293
Available for sale securities, gross unrealized losses | (15,680) | (8,511)
Investment Securities Available for Sale, at Fair Value | 318,032 | 354,247
US Government Agencies Debt Securities [Member] |  |
Available for sale securities, amortized cost | 326,676 | 354,931
Available for sale securities, gross unrealized gains | 52 | 258
Available for sale securities, gross unrealized losses | (15,550) | (8,466)
Investment Securities Available for Sale, at Fair Value | 311,178 | 346,723
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, amortized cost | 4,024 | 4,493
Available for sale securities, gross unrealized gains | 4 | 23
Available for sale securities, gross unrealized losses | (56) | (23)
Investment Securities Available for Sale, at Fair Value | 3,972 | 4,493
Corporate Debt Securities [Member] |  |
Available for sale securities, amortized cost | 2,956 | 2,048
Available for sale securities, gross unrealized gains |  | 12
Available for sale securities, gross unrealized losses | (74) |
Investment Securities Available for Sale, at Fair Value | $ 2,882 | 2,060
Asset-backed Securities [Member] |  |
Available for sale securities, amortized cost |  | 993
Available for sale securities, gross unrealized gains |  |
Available for sale securities, gross unrealized losses |  | (22)
Investment Securities Available for Sale, at Fair Value |  | $ 971

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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