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Note 4 - Investment Securities Available-for-sale - Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Available-for-sale securities in a continuous loss position, number of securities | 157 | 111
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 361,079 | $ 207,295
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 5,285 | 1,870
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 23,170 | 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 619 | 1,722
Available-for-sale securities in a continuous loss position, estimated fair value | 384,249 | 266,249
Available-for-sale securities in a continuous loss position, unrealized losses | $ 5,904 | $ 3,592
US Government Agencies Debt Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 27 | 13
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 88,991 | $ 32,927
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 1,764 | 277
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 3,768 |
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 38 |
Available-for-sale securities in a continuous loss position, estimated fair value | 92,759 | 32,927
Available-for-sale securities in a continuous loss position, unrealized losses | $ 1,802 | $ 277
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 112 | 92
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 232,347 | $ 157,871
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 3,110 | 1,438
Available-for-sale securities in a continuous loss position, 12 months or greater, estimated fair value | 19,402 | 58,954
Available-for-sale securities in a continuous loss position, 12 months or greater, unrealized losses | 581 | 1,722
Available-for-sale securities in a continuous loss position, estimated fair value | 251,749 | 216,825
Available-for-sale securities in a continuous loss position, unrealized losses | $ 3,691 | $ 3,160
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale securities in a continuous loss position, number of securities | 16 | 2
Available-for-sale securities in a continuous loss position, less than 12 months, estimated fair value | $ 34,743 | $ 1,559
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 400 | 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 | 34,743 | 1,559
Available-for-sale securities in a continuous loss position, unrealized losses | $ 400 | $ 3
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 | $ 4,998 | $ 14,938
Available-for-sale securities in a continuous loss position, less than 12 months, unrealized losses | 11 | 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 | 4,998 | 14,938
Available-for-sale securities in a continuous loss position, unrealized losses | $ 11 | $ 152

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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 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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