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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Less than 12 months, estimated fair value | $ 309,555 | $ 19,522
Less than 12 months, unrealized losses | (3,098) | (73)
12 months or more, estimated fair value | 896 | 1,076
12 months or more, unrealized losses | (23) | (8)
Total estimated fair value | 310,451 | 20,598
Total unrealized losses | (3,121) | (81)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 102,182 |
Less than 12 months, unrealized losses | (716) |
12 months or more, estimated fair value | 0 |
12 months or more, unrealized losses | 0 |
Total estimated fair value | 102,182 |
Total unrealized losses | (716) |
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 29,722 | 6,016
Less than 12 months, unrealized losses | (436) | (7)
12 months or more, estimated fair value | 0 | 896
12 months or more, unrealized losses | 0 | (6)
Total estimated fair value | 29,722 | 6,912
Total unrealized losses | (436) | (13)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 100,746 | 5,097
Less than 12 months, unrealized losses | (1,177) | (31)
12 months or more, estimated fair value | 0 | 0
12 months or more, unrealized losses | 0 | 0
Total estimated fair value | 100,746 | 5,097
Total unrealized losses | (1,177) | (31)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 67,527 | 7,875
Less than 12 months, unrealized losses | (672) | (34)
12 months or more, estimated fair value | 896 | 180
12 months or more, unrealized losses | (23) | (2)
Total estimated fair value | 68,423 | 8,055
Total unrealized losses | (695) | (36)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 9,378 | 534
Less than 12 months, unrealized losses | (97) | (1)
12 months or more, estimated fair value | 0 | 0
12 months or more, unrealized losses | 0 | 0
Total estimated fair value | 9,378 | 534
Total unrealized losses | $ (97) | $ (1)

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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=124269663&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=123581744&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=121590138&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=123581744&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=124269663&loc=SL82922890-210455 + Details
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