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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Less than 12 months, estimated fair value | $ 689,885 | $ 417,733
Less than 12 months, unrealized losses | (53,160) | (6,174)
12 months or more, estimated fair value | 95,363 | 10,085
12 months or more, unrealized losses | (13,050) | (329)
Total estimated fair value | 785,248 | 427,818
Total unrealized losses | (66,210) | (6,503)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 195,931 | 163,206
Less than 12 months, unrealized losses | (14,887) | (2,083)
12 months or more, estimated fair value | 11,227 | 0
12 months or more, unrealized losses | (1,161) | 0
Total estimated fair value | 207,158 | 163,206
Total unrealized losses | (16,048) | (2,083)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 94,147 | 30,647
Less than 12 months, unrealized losses | (5,000) | (570)
12 months or more, estimated fair value | 15,295 | 5,836
12 months or more, unrealized losses | (1,809) | (182)
Total estimated fair value | 109,442 | 36,483
Total unrealized losses | (6,809) | (752)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 81,207 | 92,192
Less than 12 months, unrealized losses | (6,843) | (1,580)
12 months or more, estimated fair value | 48,176 | 2,524
12 months or more, unrealized losses | (6,885) | (90)
Total estimated fair value | 129,383 | 94,716
Total unrealized losses | (13,728) | (1,670)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 248,471 | 115,204
Less than 12 months, unrealized losses | (21,340) | (1,667)
12 months or more, estimated fair value | 19,269 | 1,725
12 months or more, unrealized losses | (2,963) | (57)
Total estimated fair value | 267,740 | 116,929
Total unrealized losses | (24,303) | (1,724)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 70,129 | 16,484
Less than 12 months, unrealized losses | (5,090) | (274)
12 months or more, estimated fair value | 1,396 | 0
12 months or more, unrealized losses | (232) | 0
Total estimated fair value | 71,525 | 16,484
Total unrealized losses | $ (5,322) | $ (274)

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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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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