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Note 3 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) Pure in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Less than 12 months, estimated fair value | $ 14,624 | $ 406,076
Less than 12 months, unrealized losses | $ (204) | $ (31,483)
Less than 12 months, securities | 28 | 606
12 months or more, estimated fair value | $ 706,936 | $ 367,850
12 months or more, unrealized losses | $ (62,245) | $ (52,117)
12 months or more, securities | 912 | 404
Total estimated fair value | $ 721,560 | $ 773,926
Total unrealized losses | (62,449) | (83,600)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 57,882
Less than 12 months, unrealized losses | $ 0 | $ (3,960)
Less than 12 months, securities | 0 | 45
12 months or more, estimated fair value | $ 196,432 | $ 147,215
12 months or more, unrealized losses | $ (13,587) | $ (15,508)
12 months or more, securities | 121 | 89
Total estimated fair value | $ 196,432 | $ 205,097
Total unrealized losses | (13,587) | (19,468)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 1,986 | 61,821
Less than 12 months, unrealized losses | $ (11) | $ (4,293)
Less than 12 months, securities | 2 | 51
12 months or more, estimated fair value | $ 90,137 | $ 38,492
12 months or more, unrealized losses | $ (6,831) | $ (5,148)
12 months or more, securities | 78 | 32
Total estimated fair value | $ 92,123 | $ 100,313
Total unrealized losses | (6,842) | (9,441)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than 12 months, estimated fair value | 467 | 45,440
Less than 12 months, unrealized losses | $ (12) | $ (4,393)
Less than 12 months, securities | 4 | 104
12 months or more, estimated fair value | $ 101,265 | $ 70,854
12 months or more, unrealized losses | $ (14,112) | $ (12,075)
12 months or more, securities | 155 | 57
Total estimated fair value | $ 101,732 | $ 116,294
Total unrealized losses | (14,124) | (16,468)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 9,054 | 181,640
Less than 12 months, unrealized losses | $ (73) | $ (14,556)
Less than 12 months, securities | 18 | 335
12 months or more, estimated fair value | $ 251,286 | $ 97,907
12 months or more, unrealized losses | $ (22,604) | $ (16,647)
12 months or more, securities | 474 | 203
Total estimated fair value | $ 260,340 | $ 279,547
Total unrealized losses | (22,677) | (31,203)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 3,117 | 59,293
Less than 12 months, unrealized losses | $ (108) | $ (4,281)
Less than 12 months, securities | 4 | 71
12 months or more, estimated fair value | $ 67,816 | $ 13,382
12 months or more, unrealized losses | $ (5,111) | $ (2,739)
12 months or more, securities | 84 | 23
Total estimated fair value | $ 70,933 | $ 72,675
Total unrealized losses | $ (5,219) | $ (7,020)

X
- 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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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