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Note 5 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Less than 12 months, estimated fair value | $ 28,024 | $ 30,256
Less than 12 months, unrealized losses | $ (273) | $ (421)
Less than 12 months, securities | 25 | 38
12 months or more, estimated fair value | $ 517,957 | $ 606,162
12 months or more, unrealized losses | $ (29,328) | $ (51,652)
12 months or more, securities | 723 | 832
Total estimated fair value | $ 545,981 | $ 636,418
Total unrealized losses | (29,601) | (52,073)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 5,466
Less than 12 months, unrealized losses | $ 0 | $ (43)
Less than 12 months, securities | 0 | 2
12 months or more, estimated fair value | $ 117,197 | $ 159,321
12 months or more, unrealized losses | $ (4,410) | $ (8,733)
12 months or more, securities | 68 | 94
Total estimated fair value | $ 117,197 | $ 164,787
Total unrealized losses | (4,410) | (8,776)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 13,331 | 3,953
Less than 12 months, unrealized losses | $ (90) | $ (34)
Less than 12 months, securities | 8 | 2
12 months or more, estimated fair value | $ 65,022 | $ 77,166
12 months or more, unrealized losses | $ (2,782) | $ (5,160)
12 months or more, securities | 56 | 70
Total estimated fair value | $ 78,353 | $ 81,119
Total unrealized losses | (2,872) | (5,194)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Less than 12 months, estimated fair value | 10,919 | 3,740
Less than 12 months, unrealized losses | $ (59) | $ (64)
Less than 12 months, securities | 9 | 5
12 months or more, estimated fair value | $ 79,653 | $ 86,870
12 months or more, unrealized losses | $ (8,577) | $ (12,856)
12 months or more, securities | 147 | 154
Total estimated fair value | $ 90,572 | $ 90,610
Total unrealized losses | (8,636) | (12,920)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 2,274 | 13,944
Less than 12 months, unrealized losses | $ (117) | $ (253)
Less than 12 months, securities | 6 | 25
12 months or more, estimated fair value | $ 204,049 | $ 226,201
12 months or more, unrealized losses | $ (10,937) | $ (20,338)
12 months or more, securities | 389 | 440
Total estimated fair value | $ 206,323 | $ 240,145
Total unrealized losses | (11,054) | (20,591)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 1,500 | 3,153
Less than 12 months, unrealized losses | $ (7) | $ (27)
Less than 12 months, securities | 2 | 4
12 months or more, estimated fair value | $ 52,036 | $ 56,604
12 months or more, unrealized losses | $ (2,622) | $ (4,565)
12 months or more, securities | 63 | 74
Total estimated fair value | $ 53,536 | $ 59,757
Total unrealized losses | $ (2,629) | $ (4,592)

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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/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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