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Note 4 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Estimated fair value, less than 12 months | $ 212,213 | $ 205,351
Unrealized losses, less than 12 months | (56,834) | (3,916)
Estimated fair value, 12 months or longer | 146,159 | 9,101
Unrealized losses, 12 months or longer | (44,233) | (1,545)
Estimated fair value, total | 358,371 | 214,452
Unrealized losses, total | $ (101,068) | $ (5,461)
percentage | 99.80% | 40.70%
Number of securities, unrealized losses, less than 12 months | 333 | 133
Number of securities, unrealized losses, 12 months or longer | 120 | 5
Number of securitiesunrealized losses, total | 453 | 138
US Government-sponsored Enterprises Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 0 | $ 8,669
Unrealized losses, less than 12 months | 0 | (214)
Estimated fair value, 12 months or longer | 7,545 | 0
Unrealized losses, 12 months or longer | (1,338) | 0
Estimated fair value, total | 7,545 | 8,669
Unrealized losses, total | $ (1,338) | $ (214)
percentage | 100.00% | 100.00%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Estimated fair value, less than 12 months | $ 45,306 | $ 126,373
Unrealized losses, less than 12 months | (7,593) | (3,175)
Estimated fair value, 12 months or longer | 91,975 | 8,109
Unrealized losses, 12 months or longer | (21,777) | (364)
Estimated fair value, total | 137,281 | 134,482
Unrealized losses, total | $ (29,370) | $ (3,539)
percentage | 100.00% | 72.80%
US States and Political Subdivisions Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 166,907 | $ 70,309
Unrealized losses, less than 12 months | (49,241) | (527)
Estimated fair value, 12 months or longer | 45,611 | 0
Unrealized losses, 12 months or longer | (19,973) | 0
Estimated fair value, total | 212,518 | 70,309
Unrealized losses, total | $ (69,214) | $ (527)
percentage | 99.90% | 21.20%
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 | 1,027 | 992
Unrealized losses, 12 months or longer | (1,146) | (1,181)
Estimated fair value, total | 1,027 | 992
Unrealized losses, total | $ (1,146) | $ (1,181)
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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