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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Less than 12 months, estimated fair value | $ 28,146 | $ 30,256
Less than 12 months, unrealized losses | $ (329) | $ (421)
Less than 12 months, securities | 34 | 38
12 months or more, estimated fair value | $ 583,978 | $ 606,162
12 months or more, unrealized losses | $ (42,365) | $ (51,652)
12 months or more, securities | 814 | 832
Total estimated fair value | $ 612,124 | $ 636,418
Total unrealized losses | (42,694) | (52,073)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 3,903 | 5,466
Less than 12 months, unrealized losses | $ (3) | $ (43)
Less than 12 months, securities | 3 | 2
12 months or more, estimated fair value | $ 143,722 | $ 159,321
12 months or more, unrealized losses | $ (6,878) | $ (8,733)
12 months or more, securities | 83 | 94
Total estimated fair value | $ 147,625 | $ 164,787
Total unrealized losses | (6,881) | (8,776)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 5,391 | 3,953
Less than 12 months, unrealized losses | $ (42) | $ (34)
Less than 12 months, securities | 4 | 2
12 months or more, estimated fair value | $ 75,426 | $ 77,166
12 months or more, unrealized losses | $ (4,062) | $ (5,160)
12 months or more, securities | 67 | 70
Total estimated fair value | $ 80,817 | $ 81,119
Total unrealized losses | (4,104) | (5,194)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Less than 12 months, estimated fair value | 2,659 | 3,740
Less than 12 months, unrealized losses | $ (21) | $ (64)
Less than 12 months, securities | 2 | 5
12 months or more, estimated fair value | $ 85,071 | $ 86,870
12 months or more, unrealized losses | $ (11,094) | $ (12,856)
12 months or more, securities | 152 | 154
Total estimated fair value | $ 87,730 | $ 90,610
Total unrealized losses | (11,115) | (12,920)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 13,742 | 13,944
Less than 12 months, unrealized losses | $ (253) | $ (253)
Less than 12 months, securities | 22 | 25
12 months or more, estimated fair value | $ 223,917 | $ 226,201
12 months or more, unrealized losses | $ (16,540) | $ (20,338)
12 months or more, securities | 441 | 440
Total estimated fair value | $ 237,659 | $ 240,145
Total unrealized losses | (16,793) | (20,591)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 2,451 | 3,153
Less than 12 months, unrealized losses | $ (10) | $ (27)
Less than 12 months, securities | 3 | 4
12 months or more, estimated fair value | $ 55,842 | $ 56,604
12 months or more, unrealized losses | $ (3,791) | $ (4,565)
12 months or more, securities | 71 | 74
Total estimated fair value | $ 58,293 | $ 59,757
Total unrealized losses | $ (3,801) | $ (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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