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Note 4 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale, less than 12 months, fair value | $ 345 | $ 10,836
Available-for-sale, less than 12 months, unrealized losses | (1) | (92)
Available-for-sale, 12 months or more, fair value | 103,915 | 107,357
Available-for-sale, 12 months or more, unrealized losses | (2,304) | (3,251)
Held-to-maturity, less than 12 months, fair value |  | 770
Held-to-maturity, less than 12 months, unrealized losses |  |
Held-to-maturity, 12 months or more, fair value | 19,692 | 20,082
Held-to-maturity, 12 months or more, unrealized losses | (379) | (610)
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 139 | 9,417
Available-for-sale, less than 12 months, unrealized losses |  | (87)
Available-for-sale, 12 months or more, fair value | 52,754 | 53,507
Available-for-sale, 12 months or more, unrealized losses | (1,027) | (1,430)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 3 | 461
Available-for-sale, less than 12 months, unrealized losses |  | (3)
Available-for-sale, 12 months or more, fair value | 50,743 | 53,430
Available-for-sale, 12 months or more, unrealized losses | (1,276) | (1,819)
Held-to-maturity, less than 12 months, fair value |  |
Held-to-maturity, less than 12 months, unrealized losses |  |
Held-to-maturity, 12 months or more, fair value | 10,914 | 11,367
Held-to-maturity, 12 months or more, unrealized losses | (229) | (349)
US Government Agencies Debt Securities [Member] |  |
Held-to-maturity, less than 12 months, fair value |  |
Held-to-maturity, less than 12 months, unrealized losses |  |
Held-to-maturity, 12 months or more, fair value | 7,866 | 7,782
Held-to-maturity, 12 months or more, unrealized losses | (145) | (244)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 125 | 879
Available-for-sale, less than 12 months, unrealized losses |  | (2)
Available-for-sale, 12 months or more, fair value | 418 | 420
Available-for-sale, 12 months or more, unrealized losses | (1) | (2)
Held-to-maturity, less than 12 months, fair value |  | 770
Held-to-maturity, less than 12 months, unrealized losses |  |
Held-to-maturity, 12 months or more, fair value | 912 | 933
Held-to-maturity, 12 months or more, unrealized losses | (5) | (17)
US Treasury Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 78 | 79
Available-for-sale, less than 12 months, unrealized losses | (1) |
Available-for-sale, 12 months or more, fair value |  |
Available-for-sale, 12 months or more, unrealized losses |  |

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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