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Note 4 - Securities - Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Securities held-to-maturity, amortized costs |  | $ 118,662 | $ 127,164
Securities held-to-maturity, gross unrealized gains |  |  | 3,122
Securities held-to-maturity, gross unrealized losses |  |  | 173
Securities held to maturity, fair value | $ 0 | $ 119,790 | 130,113
US Government Agencies Debt Securities [Member] |  |  |
Securities held-to-maturity, amortized costs |  |  | 3,934
Securities held-to-maturity, gross unrealized gains |  |  | 167
Securities held-to-maturity, gross unrealized losses |  |  |
Securities held to maturity, fair value |  |  | 4,101
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities held-to-maturity, amortized costs |  |  | 122,039
Securities held-to-maturity, gross unrealized gains |  |  | 2,929
Securities held-to-maturity, gross unrealized losses |  |  | 173
Securities held to maturity, fair value |  |  | 124,795
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities held-to-maturity, amortized costs |  |  | 209
Securities held-to-maturity, gross unrealized gains |  |  | 21
Securities held-to-maturity, gross unrealized losses |  |  |
Securities held to maturity, fair value |  |  | 230
Corporate Debt Securities [Member] |  |  |
Securities held-to-maturity, amortized costs |  |  | 982
Securities held-to-maturity, gross unrealized gains |  |  | 5
Securities held-to-maturity, gross unrealized losses |  |  |
Securities held to maturity, fair value |  |  | $ 987

X
- 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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- Details
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- Details
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