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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale, less than 12 months, fair value | $ 50,143 | $ 66,069
Available-for-sale, less than 12 months, unrealized losses | (1,142) | (650)
Available-for-sale, 12 months or more, fair value | 83,952 | 67,434
Available-for-sale, 12 months or more, unrealized losses | (2,925) | (1,447)
Held-to-maturity, less than 12 months, fair value | 7,204 | 9,331
Held-to-maturity, less than 12 months, unrealized losses | (150) | (68)
Held-to-maturity, 12 months or more, fair value | 15,998 | 14,594
Held-to-maturity, 12 months or more, unrealized losses | (554) | (275)
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 33,424 | 47,007
Available-for-sale, less than 12 months, unrealized losses | (722) | (467)
Available-for-sale, 12 months or more, fair value | 39,041 | 21,122
Available-for-sale, 12 months or more, unrealized losses | (1,275) | (393)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 16,215 | 18,554
Available-for-sale, less than 12 months, unrealized losses | (418) | (180)
Available-for-sale, 12 months or more, fair value | 44,911 | 46,312
Available-for-sale, 12 months or more, unrealized losses | (1,650) | (1,054)
Held-to-maturity, less than 12 months, fair value | 4,730 | 7,895
Held-to-maturity, less than 12 months, unrealized losses | (109) | (63)
Held-to-maturity, 12 months or more, fair value | 8,280 | 6,675
Held-to-maturity, 12 months or more, unrealized losses | (290) | (123)
US Government Agencies Debt Securities [Member] |  |
Held-to-maturity, less than 12 months, fair value | 1,633 | 865
Held-to-maturity, less than 12 months, unrealized losses | (25) | (2)
Held-to-maturity, 12 months or more, fair value | 7,194 | 7,388
Held-to-maturity, 12 months or more, unrealized losses | (258) | (142)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 424 | 428
Available-for-sale, less than 12 months, unrealized losses | (2) | (3)
Available-for-sale, 12 months or more, fair value |  |
Available-for-sale, 12 months or more, unrealized losses |  |
Held-to-maturity, less than 12 months, fair value | 841 | 571
Held-to-maturity, less than 12 months, unrealized losses | (16) | (3)
Held-to-maturity, 12 months or more, fair value | 524 | 531
Held-to-maturity, 12 months or more, unrealized losses | (6) | (10)
US Treasury Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 80 | 80
Available-for-sale, less than 12 months, unrealized losses |  |
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=82897076&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=82897076&loc=d3e27290-111563 + Details
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