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Note 5 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Less than 12 months, estimated fair value | $ 24,314 | $ 30,256
Less than 12 months, unrealized losses | $ (256) | $ (421)
Less than 12 months, securities | 24 | 38
12 months or more, estimated fair value | $ 546,396 | $ 606,162
12 months or more, unrealized losses | $ (35,327) | $ (51,652)
12 months or more, securities | 766 | 832
Total estimated fair value | $ 570,710 | $ 636,418
Total unrealized losses | (35,583) | (52,073)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 3,020 | 5,466
Less than 12 months, unrealized losses | $ (7) | $ (43)
Less than 12 months, securities | 1 | 2
12 months or more, estimated fair value | $ 126,092 | $ 159,321
12 months or more, unrealized losses | $ (5,525) | $ (8,733)
12 months or more, securities | 73 | 94
Total estimated fair value | $ 129,112 | $ 164,787
Total unrealized losses | (5,532) | (8,776)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 3,066 | 3,953
Less than 12 months, unrealized losses | $ (22) | $ (34)
Less than 12 months, securities | 1 | 2
12 months or more, estimated fair value | $ 71,156 | $ 77,166
12 months or more, unrealized losses | $ (3,281) | $ (5,160)
12 months or more, securities | 64 | 70
Total estimated fair value | $ 74,222 | $ 81,119
Total unrealized losses | (3,303) | (5,194)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Less than 12 months, estimated fair value | 7,751 | 3,740
Less than 12 months, unrealized losses | $ (57) | $ (64)
Less than 12 months, securities | 5 | 5
12 months or more, estimated fair value | $ 82,612 | $ 86,870
12 months or more, unrealized losses | $ (9,733) | $ (12,856)
12 months or more, securities | 150 | 154
Total estimated fair value | $ 90,363 | $ 90,610
Total unrealized losses | (9,790) | (12,920)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 9,487 | 13,944
Less than 12 months, unrealized losses | $ (167) | $ (253)
Less than 12 months, securities | 16 | 25
12 months or more, estimated fair value | $ 212,559 | $ 226,201
12 months or more, unrealized losses | $ (13,677) | $ (20,338)
12 months or more, securities | 412 | 440
Total estimated fair value | $ 222,046 | $ 240,145
Total unrealized losses | (13,844) | (20,591)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 990 | 3,153
Less than 12 months, unrealized losses | $ (3) | $ (27)
Less than 12 months, securities | 1 | 4
12 months or more, estimated fair value | $ 53,977 | $ 56,604
12 months or more, unrealized losses | $ (3,111) | $ (4,565)
12 months or more, securities | 67 | 74
Total estimated fair value | $ 54,967 | $ 59,757
Total unrealized losses | $ (3,114) | $ (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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