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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale, less than 12 months, fair value | $ 58,440 | $ 142,723
Available-for-sale, less than 12 months, unrealized losses | (260) | (2,936)
Available-for-sale, 12 months or more, fair value | 51,641 | 12,625
Available-for-sale, 12 months or more, unrealized losses | (763) | (368)
Held-to-maturity, less than 12 months, fair value | 12,860 | 22,361
Held-to-maturity, less than 12 months, unrealized losses | (85) | (416)
Held-to-maturity, 12 months or more, fair value | 5,311 |
Held-to-maturity, 12 months or more, unrealized losses | (58) |
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 38,784 | 85,741
Available-for-sale, less than 12 months, unrealized losses | (115) | (1,976)
Available-for-sale, 12 months or more, fair value | 14,350 | 1,904
Available-for-sale, 12 months or more, unrealized losses | (203) | (27)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale, less than 12 months, fair value | 19,576 | 54,475
Available-for-sale, less than 12 months, unrealized losses | (145) | (946)
Available-for-sale, 12 months or more, fair value | 37,291 | 10,721
Available-for-sale, 12 months or more, unrealized losses | (560) | (341)
Held-to-maturity, less than 12 months, fair value | 9,643 | 12,776
Held-to-maturity, less than 12 months, unrealized losses | (58) | (148)
Held-to-maturity, 12 months or more, fair value | 423 |
Held-to-maturity, 12 months or more, unrealized losses | (3) |
US Government Agencies Debt Securities [Member] |  |
Available-for-sale, less than 12 months, fair value |  | 1,993
Available-for-sale, less than 12 months, unrealized losses |  | (7)
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 | 3,217 | 7,957
Held-to-maturity, less than 12 months, unrealized losses | (27) | (222)
Held-to-maturity, 12 months or more, fair value | 4,345 |
Held-to-maturity, 12 months or more, unrealized losses | (52) |
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 |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale, less than 12 months, fair value |  | 434
Available-for-sale, less than 12 months, unrealized losses |  | (7)
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 |  | 1,628
Held-to-maturity, less than 12 months, unrealized losses |  | (46)
Held-to-maturity, 12 months or more, fair value | 543 |
Held-to-maturity, 12 months or more, unrealized losses | $ (3) |

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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 twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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