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Note 3 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Less than 12 months, estimated fair value | $ 30,256 | $ 14,624
Less than 12 months, unrealized losses | $ (421) | $ (204)
Less than 12 months, securities | 38 | 28
12 months or more, estimated fair value | $ 606,162 | $ 706,936
12 months or more, unrealized losses | $ (51,652) | $ (62,245)
12 months or more, securities | 832 | 912
Total estimated fair value | $ 636,418 | $ 721,560
Total unrealized losses | (52,073) | (62,449)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 5,466 | 0
Less than 12 months, unrealized losses | $ (43) | $ 0
Less than 12 months, securities | 2 | 0
12 months or more, estimated fair value | $ 159,321 | $ 196,432
12 months or more, unrealized losses | $ (8,733) | $ (13,587)
12 months or more, securities | 94 | 121
Total estimated fair value | $ 164,787 | $ 196,432
Total unrealized losses | (8,776) | (13,587)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 3,953 | 1,986
Less than 12 months, unrealized losses | $ (34) | $ (11)
Less than 12 months, securities | 2 | 2
12 months or more, estimated fair value | $ 77,166 | $ 90,137
12 months or more, unrealized losses | $ (5,160) | $ (6,831)
12 months or more, securities | 70 | 78
Total estimated fair value | $ 81,119 | $ 92,123
Total unrealized losses | (5,194) | (6,842)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Less than 12 months, estimated fair value | 3,740 | 467
Less than 12 months, unrealized losses | $ (64) | $ (12)
Less than 12 months, securities | 5 | 4
12 months or more, estimated fair value | $ 86,870 | $ 101,265
12 months or more, unrealized losses | $ (12,856) | $ (14,112)
12 months or more, securities | 154 | 155
Total estimated fair value | $ 90,610 | $ 101,732
Total unrealized losses | (12,920) | (14,124)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 13,944 | 9,054
Less than 12 months, unrealized losses | $ (253) | $ (73)
Less than 12 months, securities | 25 | 18
12 months or more, estimated fair value | $ 226,201 | $ 251,286
12 months or more, unrealized losses | $ (20,338) | $ (22,604)
12 months or more, securities | 440 | 474
Total estimated fair value | $ 240,145 | $ 260,340
Total unrealized losses | (20,591) | (22,677)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 3,153 | 3,117
Less than 12 months, unrealized losses | $ (27) | $ (108)
Less than 12 months, securities | 4 | 4
12 months or more, estimated fair value | $ 56,604 | $ 67,816
12 months or more, unrealized losses | $ (4,565) | $ (5,111)
12 months or more, securities | 74 | 84
Total estimated fair value | $ 59,757 | $ 70,933
Total unrealized losses | $ (4,592) | $ (5,219)

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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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