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Note 2 - Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Continuous unrealized loss, less than 12 months, fair value | $ 100,593 | $ 123,708
Continuous unrealized loss, less than 12 months, gross unrealized losses | (3,426) | (1,700)
Continuous unrealized loss, greater than 12 months, fair value | 211,591 | 190,196
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (12,254) | (6,811)
Continuous unrealized loss, fair value | 312,184 | 313,904
Continuous unrealized loss, gross unrealized losses | (15,680) | (8,511)
US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 96,095 | 120,139
Continuous unrealized loss, less than 12 months, gross unrealized losses | (3,370) | (1,655)
Continuous unrealized loss, greater than 12 months, fair value | 209,451 | 190,196
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (12,180) | (6,811)
Continuous unrealized loss, fair value | 305,546 | 310,335
Continuous unrealized loss, gross unrealized losses | (15,550) | (8,466)
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 2,498 | 2,598
Continuous unrealized loss, less than 12 months, gross unrealized losses | (21) | (23)
Continuous unrealized loss, greater than 12 months, fair value | 1,258 |
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (35) |
Continuous unrealized loss, fair value | 3,756 | 2,598
Continuous unrealized loss, gross unrealized losses | (56) | (23)
Corporate Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 2,000 |
Continuous unrealized loss, less than 12 months, gross unrealized losses | (35) |
Continuous unrealized loss, greater than 12 months, fair value | 882 |
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (39) |
Continuous unrealized loss, fair value | 2,882 |
Continuous unrealized loss, gross unrealized losses | $ (74) |
Asset-backed Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value |  | 971
Continuous unrealized loss, less than 12 months, gross unrealized losses |  | (22)
Continuous unrealized loss, greater than 12 months, fair value |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  |
Continuous unrealized loss, fair value |  | 971
Continuous unrealized loss, gross unrealized losses |  | $ (22)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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