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Note 3 - Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Continuous unrealized loss, less than 12 months, fair value | $ 64,117 | $ 41,704
Continuous unrealized loss, less than 12 months, gross unrealized losses | (331) | (528)
Continuous unrealized loss, greater than 12 months, fair value | 119,894 | 258,492
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (1,927) | (10,160)
Continuous unrealized loss, fair value | 184,011 | 300,196
Continuous unrealized loss, gross unrealized losses | (2,258) | (10,688)
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 3,257 | 612
Continuous unrealized loss, less than 12 months, gross unrealized losses | (54) | (3)
Continuous unrealized loss, greater than 12 months, fair value |  | 1,882
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  | (34)
Continuous unrealized loss, fair value | 3,257 | 2,494
Continuous unrealized loss, gross unrealized losses | (54) | (37)
Corporate Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value |  | 2,009
Continuous unrealized loss, less than 12 months, gross unrealized losses |  | (21)
Continuous unrealized loss, greater than 12 months, fair value | 784 | 863
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (16) | (34)
Continuous unrealized loss, fair value | 784 | 2,872
Continuous unrealized loss, gross unrealized losses | (16) | (55)
US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 60,860 | 39,083
Continuous unrealized loss, less than 12 months, gross unrealized losses | (277) | (504)
Continuous unrealized loss, greater than 12 months, fair value | 119,110 | 255,747
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (1,911) | (10,092)
Continuous unrealized loss, fair value | 179,970 | 294,830
Continuous unrealized loss, gross unrealized losses | $ (2,188) | $ (10,596)

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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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: 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=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + 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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + 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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + 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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: 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=118939692&loc=d3e27337-111563 + Details
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