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Note 4 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated fair value, less than 12 months | $ 0 | $ 0
Unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or longer | 345,401 | 362,299
Unrealized losses, 12 months or longer | (74,086) | (67,963)
Estimated fair value, total | 345,401 | 362,299
Unrealized losses, total | $ (74,086) | $ (67,963)
percentage | 99.80% | 97.60%
Number of securities, unrealized losses, less than 12 months | 0 | 0
Number of securities, unrealized losses, 12 months or longer | 420 | 434
Number of securitiesunrealized losses, total | 420 | 434
US Government-sponsored Enterprises Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 0 | $ 0
Unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or longer | 7,866 | 7,883
Unrealized losses, 12 months or longer | (1,018) | (1,001)
Estimated fair value, total | 7,866 | 7,883
Unrealized losses, total | $ (1,018) | $ (1,001)
percentage | 100.00% | 100.00%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Estimated fair value, less than 12 months | $ 0 | $ 0
Unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or longer | 117,897 | 123,464
Unrealized losses, 12 months or longer | (27,180) | (25,946)
Estimated fair value, total | 117,897 | 123,464
Unrealized losses, total | $ (27,180) | $ (25,946)
percentage | 100.00% | 100.00%
US States and Political Subdivisions Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 0 | $ 0
Unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or longer | 218,196 | 229,595
Unrealized losses, 12 months or longer | (45,164) | (40,203)
Estimated fair value, total | 218,196 | 229,595
Unrealized losses, total | $ (45,164) | $ (40,203)
percentage | 99.60% | 96.20%
Collateralized Debt Obligations [Member] |  |
Estimated fair value, less than 12 months | $ 0 | $ 0
Unrealized losses, less than 12 months | 0 | 0
Estimated fair value, 12 months or longer | 1,442 | 1,357
Unrealized losses, 12 months or longer | (724) | (813)
Estimated fair value, total | 1,442 | 1,357
Unrealized losses, total | $ (724) | $ (813)
percentage | 100.00% | 100.00%

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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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