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Note 3 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-Sale, Less than 12 Months, Fair Value | $ 142,723 | $ 111,208
Available-for-Sale, Less than 12 Months, Unrealized Losses | (2,936) | (751)
Available-for-Sale, 12 Months or More, Fair Value | 12,625 | 17,979
Available-for-Sale, 12 Months or More, Unrealized Losses | (368) | (494)
Held-to-Maturity, Less than 12 Months, Fair Value | 22,361 | 25,878
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (416) | (218)
Held-to-Maturity, 12 Months or More, Unrealized Losses |  | (1,560)
Held-to-Maturity, 12 Months or More, Fair Value |  | 1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses |  | (27)
Residential Mortgage Backed Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 85,741 | 83,403
Available-for-Sale, Less than 12 Months, Unrealized Losses | (1,976) | (458)
Available-for-Sale, 12 Months or More, Fair Value | 1,904 | 9,061
Available-for-Sale, 12 Months or More, Unrealized Losses | (27) | (150)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 54,475 | 24,337
Available-for-Sale, Less than 12 Months, Unrealized Losses | (946) | (272)
Available-for-Sale, 12 Months or More, Fair Value | 10,721 | 8,918
Available-for-Sale, 12 Months or More, Unrealized Losses | (341) | (344)
Held-to-Maturity, Less than 12 Months, Fair Value | 12,776 | 14,143
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (148) | (170)
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 | 1,982
Available-for-Sale, Less than 12 Months, Unrealized Losses | (7) | (17)
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 | 7,957 | 11,163
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (222) | (44)
Held-to-Maturity, 12 Months or More, Unrealized Losses |  | (1,560)
Held-to-Maturity, 12 Months or More, Fair Value |  | 1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses |  | (27)
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 434 | 707
Available-for-Sale, Less than 12 Months, Unrealized Losses | (7) | (4)
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 | 572
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (46) | (4)
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 |  |
Corporate Debt Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value |  | 779
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 Treasury Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 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=73527792&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=73527792&loc=d3e27337-111563 + Details
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