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Note 7 - Securities - Available-for-sale Securities With Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | $ 53,233 | $ 13,548
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (336) | (25)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 53,990 | 220,625
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | (626) | (7,205)
Available-for-sale securities with unrealized loss positions, fair value | 107,223 | 234,173
Available-for-sale securities, with unrealized loss positions, unrealized losses | (962) | (7,230)
Obligations of States and Political Subdivisions Tax Exempt [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 6,429 | 5,084
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (38) | (11)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 0 | 32,684
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | 0 | (1,190)
Available-for-sale securities with unrealized loss positions, fair value | 6,429 | 37,768
Available-for-sale securities, with unrealized loss positions, unrealized losses | (38) | (1,201)
Obligations of States and Political Subdivisions Taxable [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 5,624 | 980
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (68) | (2)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 161 | 11,418
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | (2) | (125)
Available-for-sale securities with unrealized loss positions, fair value | 5,785 | 12,398
Available-for-sale securities, with unrealized loss positions, unrealized losses | (70) | (127)
Residential Pass-Through Securities [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 9,771 | 5,592
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (35) | (4)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 14,787 | 42,309
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | (102) | (1,426)
Available-for-sale securities with unrealized loss positions, fair value | 24,558 | 47,901
Available-for-sale securities, with unrealized loss positions, unrealized losses | (137) | (1,430)
Residential Collateralized Mortgage Obligations [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 31,409 | 1,892
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | (195) | (8)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 30,535 | 101,662
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | (415) | (3,282)
Available-for-sale securities with unrealized loss positions, fair value | 61,944 | 103,554
Available-for-sale securities, with unrealized loss positions, unrealized losses | (610) | (3,290)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value | 0 | 0
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses | 0 | 0
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value | 8,507 | 32,552
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses | (107) | (1,182)
Available-for-sale securities with unrealized loss positions, fair value | 8,507 | 32,552
Available-for-sale securities, with unrealized loss positions, unrealized losses | $ (107) | $ (1,182)

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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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