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Note 3 - Securities - Securities with Gross Unrealized Losses Not Recognized in Income (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Estimated fair value, less than 12 months | $ 205,351 | $ 18,792
Unrealized losses, less than 12 months | (3,916) | (62)
Estimated fair value, 12 months or longer | 9,101 | 929
Unrealized losses, 12 months or longer | (1,545) | (1,253)
Estimated fair value, total | 214,452 | 19,721
Unrealized losses, total | $ (5,461) | $ (1,315)
percentage | 40.70% | 4.80%
Number of securities, unrealized losses, less than 12 months | 133 | 8
Number of securities, unrealized losses, 12 months or longer | 5 | 2
Number of securitiesunrealized losses, total | 138 | 10
US Government-sponsored Enterprises Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 8,669 | $ 4,975
Unrealized losses, less than 12 months | (214) | (24)
Estimated fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Estimated fair value, total | 8,669 | 4,975
Unrealized losses, total | $ (214) | $ (24)
percentage | 100.00% | 63.30%
Collateralized Mortgage Obligations and Residential Mortgage Backed Securities [Member] |  |
Estimated fair value, less than 12 months | $ 126,373 | $ 11,953
Unrealized losses, less than 12 months | (3,175) | (36)
Estimated fair value, 12 months or longer | 8,109 | 0
Unrealized losses, 12 months or longer | (364) | 0
Estimated fair value, total | 134,482 | 11,953
Unrealized losses, total | $ (3,539) | $ (36)
percentage | 72.80% | 7.70%
US States and Political Subdivisions Debt Securities [Member] |  |
Estimated fair value, less than 12 months | $ 70,309 | $ 1,864
Unrealized losses, less than 12 months | (527) | (2)
Estimated fair value, 12 months or longer | 0 | 0
Unrealized losses, 12 months or longer | 0 | 0
Estimated fair value, total | 70,309 | 1,864
Unrealized losses, total | $ (527) | $ (2)
percentage | 21.20% | 1.00%
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 | 992 | 929
Unrealized losses, 12 months or longer | (1,181) | (1,253)
Estimated fair value, total | 992 | 929
Unrealized losses, total | $ (1,181) | $ (1,253)
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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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