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Note 6 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Estimated fair value, less than 12 months | $ 14,196 | $ 204,281
Unrealized losses, less than 12 months | (322) | (40,890)
Estimated fair value, 12 months or longer | 353,586 | 163,050
Unrealized losses, 12 months or longer | (73,271) | (43,698)
Estimated fair value, total | 367,782 | 367,331
Unrealized losses, total | $ (73,593) | $ (84,588)
percentage | 97.30% | 99.00%
Number of securities, unrealized losses, less than 12 months | 28 | 311
Number of securities, unrealized losses, 12 months or longer | 408 | 135
Number of securitiesunrealized losses, total | 436 | 446
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 | 7,742 | 7,625
Unrealized losses, 12 months or longer | (1,141) | (1,258)
Estimated fair value, total | 7,742 | 7,625
Unrealized losses, total | $ (1,141) | $ (1,258)
percentage | 100.00% | 100.00%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Estimated fair value, less than 12 months | $ 3,617 | $ 32,700
Unrealized losses, less than 12 months | (125) | (4,955)
Estimated fair value, 12 months or longer | 129,692 | 101,416
Unrealized losses, 12 months or longer | (25,942) | (23,929)
Estimated fair value, total | 133,309 | 134,116
Unrealized losses, total | $ (26,067) | $ (28,884)
percentage | 100.00% | 100.00%
US States and Political Subdivisions Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 10,579 | $ 171,581
Unrealized losses, less than 12 months | (197) | (35,935)
Estimated fair value, 12 months or longer | 215,135 | 52,961
Unrealized losses, 12 months or longer | (45,032) | (17,386)
Estimated fair value, total | 225,714 | 224,542
Unrealized losses, total | $ (45,229) | $ (53,321)
percentage | 95.90% | 98.60%
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 | 1,017 | 1,048
Unrealized losses, 12 months or longer | (1,156) | (1,125)
Estimated fair value, total | 1,017 | 1,048
Unrealized losses, total | $ (1,156) | $ (1,125)
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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