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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Less than 12 months, estimated fair value | $ 603,352 | $ 417,733
Less than 12 months, unrealized losses | (32,528) | (6,174)
12 months or more, estimated fair value | 100,318 | 10,085
12 months or more, unrealized losses | (9,459) | (329)
Total estimated fair value | 703,670 | 427,818
Total unrealized losses | (41,987) | (6,503)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 181,570 | 163,206
Less than 12 months, unrealized losses | (10,962) | (2,083)
12 months or more, estimated fair value | 11,487 | 0
12 months or more, unrealized losses | (924) | 0
Total estimated fair value | 193,057 | 163,206
Total unrealized losses | (11,886) | (2,083)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 77,732 | 30,647
Less than 12 months, unrealized losses | (3,006) | (570)
12 months or more, estimated fair value | 15,671 | 5,836
12 months or more, unrealized losses | (1,438) | (182)
Total estimated fair value | 93,403 | 36,483
Total unrealized losses | (4,444) | (752)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 82,105 | 92,192
Less than 12 months, unrealized losses | (4,063) | (1,580)
12 months or more, estimated fair value | 51,997 | 2,524
12 months or more, unrealized losses | (4,853) | (90)
Total estimated fair value | 134,102 | 94,716
Total unrealized losses | (8,916) | (1,670)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 218,589 | 115,204
Less than 12 months, unrealized losses | (11,894) | (1,667)
12 months or more, estimated fair value | 19,703 | 1,725
12 months or more, unrealized losses | (2,070) | (57)
Total estimated fair value | 238,292 | 116,929
Total unrealized losses | (13,964) | (1,724)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 43,356 | 16,484
Less than 12 months, unrealized losses | (2,603) | (274)
12 months or more, estimated fair value | 1,460 | 0
12 months or more, unrealized losses | (174) | 0
Total estimated fair value | 44,816 | 16,484
Total unrealized losses | $ (2,777) | $ (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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