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Note 4 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Estimated fair value, less than 12 months | $ 0 | $ 3,310
Unrealized losses, less than 12 months | 0 | (156)
Estimated fair value, 12 months or longer | 330,127 | 330,244
Unrealized losses, 12 months or longer | (76,624) | (76,258)
Estimated fair value, total | 330,127 | 333,554
Unrealized losses, total | $ (76,624) | $ (76,414)
percentage | 100.00% | 100.00%
Number of securities, unrealized losses, less than 12 months | 0 | 4
Number of securities, unrealized losses, 12 months or longer | 413 | 409
Number of securitiesunrealized losses, total | 413 | 413
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 | 8,215 | 8,061
Unrealized losses, 12 months or longer | (669) | (823)
Estimated fair value, total | 8,215 | 8,061
Unrealized losses, total | $ (669) | $ (823)
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 | 109,583 | 109,325
Unrealized losses, 12 months or longer | (23,516) | (26,649)
Estimated fair value, total | 109,583 | 109,325
Unrealized losses, total | $ (23,516) | $ (26,649)
percentage | 100.00% | 100.00%
US States and Political Subdivisions Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 0 | $ 3,310
Unrealized losses, less than 12 months | 0 | (156)
Estimated fair value, 12 months or longer | 210,699 | 211,439
Unrealized losses, 12 months or longer | (51,917) | (48,049)
Estimated fair value, total | 210,699 | 214,749
Unrealized losses, total | $ (51,917) | $ (48,205)
percentage | 100.00% | 100.00%
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 | 1,630 | 1,419
Unrealized losses, 12 months or longer | (522) | (737)
Estimated fair value, total | 1,630 | 1,419
Unrealized losses, total | $ (522) | $ (737)
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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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
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