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Note 5 - Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Residential Mortgage Backed Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 7,855 | $ 83,403
Available-for-Sale, Less than 12 Months, Unrealized Losses | (15) | (458)
Available-for-Sale, 12 Months or More, Fair Value | 1,954 | 9,061
Available-for-Sale, 12 Months or More, Unrealized Losses | (23) | (150)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value | 28,829 | 24,337
Available-for-Sale, Less than 12 Months, Unrealized Losses | (82) | (272)
Available-for-Sale, 12 Months or More, Fair Value | 11,498 | 8,918
Available-for-Sale, 12 Months or More, Unrealized Losses | (302) | (344)
Held-to-Maturity, Less than 12 Months, Fair Value | 1,948 | 14,143
Held-to-Maturity, Less than 12 Months, Unrealized Losses |  | (170)
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 |  | 1,982
Available-for-Sale, Less than 12 Months, Unrealized Losses |  | (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 | 1,397 | 11,163
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (2) | (44)
Held-to-Maturity, 12 Months or More, Fair Value |  | 1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses |  | (27)
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 |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-Sale, Less than 12 Months, Fair Value |  | 707
Available-for-Sale, Less than 12 Months, Unrealized Losses |  | (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 | 563 | 572
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (3) | (4)
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 |  |
Available-for-Sale, Less than 12 Months, Fair Value | 36,764 | 111,208
Available-for-Sale, Less than 12 Months, Unrealized Losses | (97) | (751)
Available-for-Sale, 12 Months or More, Fair Value | 13,452 | 17,979
Available-for-Sale, 12 Months or More, Unrealized Losses | (325) | (494)
Held-to-Maturity, Less than 12 Months, Fair Value | 3,908 | 25,878
Held-to-Maturity, Less than 12 Months, Unrealized Losses | (5) | (218)
Held-to-Maturity, 12 Months or More, Fair Value |  | 1,560
Held-to-Maturity, 12 Months or More, Unrealized Losses |  | $ (27)

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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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