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Note 4 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held-to-maturity, amortized costs | $ 122,905 | $ 127,164
Securities held-to-maturity, gross unrealized gains | 2,301 | 3,122
Securities held-to-maturity, gross unrealized losses | 657 | 173
Securities held-to-maturity, fair values | 124,549 | 130,113
US Government Agencies Debt Securities [Member] |  |
Securities held-to-maturity, amortized costs | 3,934 | 3,934
Securities held-to-maturity, gross unrealized gains | 99 | 167
Securities held-to-maturity, gross unrealized losses | 1 | 0
Securities held-to-maturity, fair values | 4,032 | 4,101
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized costs | 117,791 | 122,039
Securities held-to-maturity, gross unrealized gains | 2,184 | 2,929
Securities held-to-maturity, gross unrealized losses | 649 | 173
Securities held-to-maturity, fair values | 119,326 | 124,795
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized costs | 196 | 209
Securities held-to-maturity, gross unrealized gains | 18 | 21
Securities held-to-maturity, gross unrealized losses | 0 | 0
Securities held-to-maturity, fair values | 214 | 230
Corporate Debt Securities [Member] |  |
Securities held-to-maturity, amortized costs | 984 | 982
Securities held-to-maturity, gross unrealized gains |  | 5
Securities held-to-maturity, gross unrealized losses | 7 | 0
Securities held-to-maturity, fair values | $ 977 | $ 987

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Details
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- Details
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