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Note 6 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Less than 12 months, estimated fair value | $ 2,810 | $ 14,624
Less than 12 months, unrealized losses | $ (14) | $ (204)
Less than 12 months, securities | 8 | 28
12 months or more, estimated fair value | $ 646,591 | $ 706,936
12 months or more, unrealized losses | $ (39,821) | $ (62,245)
12 months or more, securities | 854 | 912
Total estimated fair value | $ 649,401 | $ 721,560
Total unrealized losses | (39,835) | (62,449)
US Treasury Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 0
Less than 12 months, unrealized losses | $ 0 | $ 0
Less than 12 months, securities | 0 | 0
12 months or more, estimated fair value | $ 170,184 | $ 196,432
12 months or more, unrealized losses | $ (7,840) | $ (13,587)
12 months or more, securities | 102 | 121
Total estimated fair value | $ 170,184 | $ 196,432
Total unrealized losses | (7,840) | (13,587)
US Government Agencies Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 1,986
Less than 12 months, unrealized losses | $ 0 | $ (11)
Less than 12 months, securities | 0 | 2
12 months or more, estimated fair value | $ 85,317 | $ 90,137
12 months or more, unrealized losses | $ (4,064) | $ (6,831)
12 months or more, securities | 73 | 78
Total estimated fair value | $ 85,317 | $ 92,123
Total unrealized losses | (4,064) | (6,842)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] |  |
Less than 12 months, estimated fair value | 0 | 467
Less than 12 months, unrealized losses | $ 0 | $ (12)
Less than 12 months, securities | 0 | 4
12 months or more, estimated fair value | $ 93,339 | $ 101,265
12 months or more, unrealized losses | $ (10,142) | $ (14,112)
12 months or more, securities | 154 | 155
Total estimated fair value | $ 93,339 | $ 101,732
Total unrealized losses | (10,142) | (14,124)
US States and Political Subdivisions Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 2,810 | 9,054
Less than 12 months, unrealized losses | $ (14) | $ (73)
Less than 12 months, securities | 8 | 18
12 months or more, estimated fair value | $ 236,197 | $ 251,286
12 months or more, unrealized losses | $ (14,456) | $ (22,604)
12 months or more, securities | 447 | 474
Total estimated fair value | $ 239,007 | $ 260,340
Total unrealized losses | (14,470) | (22,677)
Corporate Debt Securities [Member] |  |
Less than 12 months, estimated fair value | 0 | 3,117
Less than 12 months, unrealized losses | $ 0 | $ (108)
Less than 12 months, securities | 0 | 4
12 months or more, estimated fair value | $ 61,554 | $ 67,816
12 months or more, unrealized losses | $ (3,319) | $ (5,111)
12 months or more, securities | 78 | 84
Total estimated fair value | $ 61,554 | $ 70,933
Total unrealized losses | $ (3,319) | $ (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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