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Note 3 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-Sale, Less than 12 Months, Fair Value | $ 124,317 | $ 142,723
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1,732) | (2,936)
Available-for-Sale, 12 Months or More, Fair Value | 19,795 | 12,625
Available-for-Sale, 12 Months or More, Unrealized Losses | (370) | (368)
Held-to-Maturity, Less than 12 Months, Fair Value | 22,704 | 22,361
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (299) | (416)
Held-to-Maturity, 12 Months or More, Unrealized Losses | (549) |
Held-to-Maturity, 12 Months or More, Fair Value | 549 |
Held-to-Maturity, 12 Months or More, Unrealized Losses | (7) |
Residential Mortgage Backed Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 75,284 | 85,741
Available-for-Sale, Less than 12 Months, Unrealized Losses | (917) | (1,976)
Available-for-Sale, 12 Months or More, Fair Value | 1,729 | 1,904
Available-for-Sale, 12 Months or More, Unrealized Losses | (21) | (27)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 48,106 | 54,475
Available-for-Sale, Less than 12 Months, Unrealized Losses | (807) | (946)
Available-for-Sale, 12 Months or More, Fair Value | 18,066 | 10,721
Available-for-Sale, 12 Months or More, Unrealized Losses | (349) | (341)
Held-to-Maturity, Less than 12 Months, Fair Value | 13,030 | 12,776
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (132) | (148)
Held-to-Maturity, 12 Months or More, Unrealized Losses |  |
Held-to-Maturity, 12 Months or More, Fair Value |  |
Held-to-Maturity, 12 Months or More, Unrealized Losses |  |
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 | 8,618 | 7,957
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (152) | (222)
Held-to-Maturity, 12 Months or More, Unrealized Losses |  |
Held-to-Maturity, 12 Months or More, Fair Value |  |
Held-to-Maturity, 12 Months or More, Unrealized Losses |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 847 | 434
Available-for-Sale, Less than 12 Months, Unrealized Losses | (8) | (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 | 1,056 | 1,628
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (15) | (46)
Held-to-Maturity, 12 Months or More, Unrealized Losses | (549) |
Held-to-Maturity, 12 Months or More, Fair Value | 549 |
Held-to-Maturity, 12 Months or More, Unrealized Losses | (7) |
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 |  |

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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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