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Note 2 - Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Continuous unrealized loss, less than 12 months, fair value | $ 201,090 | $ 177,689
Continuous unrealized loss, less than 12 months, gross unrealized losses | (3,420) | (3,490)
Continuous unrealized loss, greater than 12 months, fair value | 108,603 | 107,482
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (4,124) | (4,213)
Continuous unrealized loss, fair value | 309,693 | 285,171
Continuous unrealized loss, gross unrealized losses | (7,544) | (7,703)
US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 196,927 | 174,201
Continuous unrealized loss, less than 12 months, gross unrealized losses | (3,362) | (3,460)
Continuous unrealized loss, greater than 12 months, fair value | 108,603 | 107,482
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (4,124) | (4,213)
Continuous unrealized loss, fair value | 305,530 | 281,683
Continuous unrealized loss, gross unrealized losses | (7,486) | (7,673)
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 2,138 | 3,488
Continuous unrealized loss, less than 12 months, gross unrealized losses | (23) | (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 | 2,138 | 3,488
Continuous unrealized loss, gross unrealized losses | (23) | $ (30)
Corporate Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 2,025 |
Continuous unrealized loss, less than 12 months, gross unrealized losses | (35) |
Continuous unrealized loss, greater than 12 months, fair value |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  |
Continuous unrealized loss, fair value | 2,025 |
Continuous unrealized loss, gross unrealized losses | $ (35) |

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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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