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Note 2 - Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Continuous unrealized loss, less than 12 months, fair value | $ 139,240 | $ 177,689
Continuous unrealized loss, less than 12 months, gross unrealized losses | (2,022) | (3,490)
Continuous unrealized loss, greater than 12 months, fair value | 126,175 | 107,482
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (4,113) | (4,213)
Continuous unrealized loss, fair value | 265,415 | 285,171
Continuous unrealized loss, gross unrealized losses | (6,135) | (7,703)
US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 136,825 | 174,201
Continuous unrealized loss, less than 12 months, gross unrealized losses | (1,973) | (3,460)
Continuous unrealized loss, greater than 12 months, fair value | 126,175 | 107,482
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (4,113) | (4,213)
Continuous unrealized loss, fair value | 263,000 | 281,683
Continuous unrealized loss, gross unrealized losses | (6,086) | (7,673)
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 1,423 | 3,488
Continuous unrealized loss, less than 12 months, gross unrealized losses | (25) | (30)
Continuous unrealized loss, greater than 12 months, fair value |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  |
Continuous unrealized loss, fair value | 1,423 | 3,488
Continuous unrealized loss, gross unrealized losses | (25) | $ (30)
Asset-backed Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 992 |
Continuous unrealized loss, less than 12 months, gross unrealized losses | (24) |
Continuous unrealized loss, greater than 12 months, fair value |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  |
Continuous unrealized loss, fair value | 992 |
Continuous unrealized loss, gross unrealized losses | $ (24) |

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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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- 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=82897076&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=82897076&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=82897076&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=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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