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Note 3 - Investment Securities Available-for-sale - Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
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US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 14 | 13
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 38,625 | $ 32,927
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 107 | 277
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 1,986 |
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 29 |
Available-for-sale securities in a continuous loss position, estimated fair value | 40,611 | 32,927
Available-for-sale securities in a continuous loss position, unrealized losses | $ 136 | $ 277
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 38 | 92
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 57,588 | $ 157,871
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 162 | 1,438
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 20,789 | 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 188 | 1,722
Available-for-sale securities in a continuous loss position, estimated fair value | 78,377 | 216,825
Available-for-sale securities in a continuous loss position, unrealized losses | $ 350 | $ 3,160
Corporate Debt Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 2 | 4
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 4,986 | $ 14,938
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 23 | 152
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value |  |
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses |  |
Available-for-sale securities in a continuous loss position, estimated fair value | 4,986 | 14,938
Available-for-sale securities in a continuous loss position, unrealized losses | $ 23 | $ 152
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities |  | 2
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value |  | $ 1,559
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses |  | 3
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value |  |
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses |  |
Available-for-sale securities in a continuous loss position, estimated fair value |  | 1,559
Available-for-sale securities in a continuous loss position, unrealized losses |  | $ 3
Available-for-sale securities in a continuous loss position, number of securities | 54 | 111
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 101,199 | $ 207,295
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 292 | 1,870
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 22,775 | 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 217 | 1,722
Available-for-sale securities in a continuous loss position, estimated fair value | 123,974 | 266,249
Available-for-sale securities in a continuous loss position, unrealized losses | $ 509 | $ 3,592

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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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 Reference 2: 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + 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=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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