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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 268,457 | $ 24,011
Securities available for sale, less than 12 months, unrealized losses | (15,556) | (269)
Securities available for sale, 12 months or longer, fair value | 20,794 | 8,843
Securities available for sale, 12 months or longer, unrealized losses | (4,242) | (423)
Securities available for sale, total fair value | 289,251 | 32,854
Securities available for sale, total unrealized losses | (19,798) | (692)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 1,485 | 0
Securities available for sale, less than 12 months, unrealized losses | (15) | 0
Securities available for sale, 12 months or longer, fair value | 0 | 459
Securities available for sale, 12 months or longer, unrealized losses | 0 | (3)
Securities available for sale, total fair value | 1,485 | 459
Securities available for sale, total unrealized losses | (15) | (3)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 157,264 |
Securities available for sale, less than 12 months, unrealized losses | (4,353) |
Securities available for sale, 12 months or longer, fair value | 0 |
Securities available for sale, 12 months or longer, unrealized losses | 0 |
Securities available for sale, total fair value | 157,264 |
Securities available for sale, total unrealized losses | (4,353) |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 12,347 | 0
Securities available for sale, less than 12 months, unrealized losses | (192) | 0
Securities available for sale, 12 months or longer, fair value | 0 | 0
Securities available for sale, 12 months or longer, unrealized losses | 0 | 0
Securities available for sale, total fair value | 12,347 | 0
Securities available for sale, total unrealized losses | (192) | 0
Corporate Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 32,368 | 9,919
Securities available for sale, less than 12 months, unrealized losses | (2,172) | (16)
Securities available for sale, 12 months or longer, fair value | 2,489 | 0
Securities available for sale, 12 months or longer, unrealized losses | (17) | 0
Securities available for sale, total fair value | 34,857 | 9,919
Securities available for sale, total unrealized losses | (2,189) | (16)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 64,993 | 14,092
Securities available for sale, less than 12 months, unrealized losses | (8,824) | (253)
Securities available for sale, 12 months or longer, fair value | 18,305 | 8,384
Securities available for sale, 12 months or longer, unrealized losses | (4,225) | (420)
Securities available for sale, total fair value | 83,298 | 22,476
Securities available for sale, total unrealized losses | $ (13,049) | $ (673)

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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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- 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 less 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 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 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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