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Note 4 - Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available-for-sale, amortized costs | $ 345,260 | $ 336,075
Securities available-for-sale, gross unrealized gains | 554 | 954
Securities available-for-sale, gross unrealized losses | 8,603 | 5,642
Securities available-for-sale, fair values | 337,211 | 331,387
US Government Agencies Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 322,585 | 312,604
Securities available-for-sale, gross unrealized gains | 393 | 609
Securities available-for-sale, gross unrealized losses | 8,089 | 5,494
Securities available-for-sale, fair values | 314,889 | 307,719
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 16,101 | 16,853
Securities available-for-sale, gross unrealized gains | 69 | 100
Securities available-for-sale, gross unrealized losses | 392 | 119
Securities available-for-sale, fair values | 15,778 | 16,834
Collateralized Mortgage Backed Securities [Member] |  |
Securities available-for-sale, amortized costs | 558 | 602
Securities available-for-sale, gross unrealized gains | 50 | 57
Securities available-for-sale, gross unrealized losses | 0 | 0
Securities available-for-sale, fair values | 608 | 659
Corporate Debt Securities [Member] |  |
Securities available-for-sale, amortized costs | 6,016 | 6,016
Securities available-for-sale, gross unrealized gains | 42 | 188
Securities available-for-sale, gross unrealized losses | 122 | 29
Securities available-for-sale, fair values | $ 5,936 | $ 6,175

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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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- Definition Amount 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 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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