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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 34,752 | $ 268,457
Securities available for sale, less than 12 months, unrealized losses | (476) | (15,556)
Securities available for sale, 12 months or longer, fair value | 238,489 | 20,794
Securities available for sale, 12 months or longer, unrealized losses | (21,483) | (4,242)
Securities available for sale, total fair value | 273,241 | 289,251
Securities available for sale, total unrealized losses | (21,959) | (19,798)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 5,741 | 1,485
Securities available for sale, less than 12 months, unrealized losses | (9) | (15)
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 | 5,741 | 1,485
Securities available for sale, total unrealized losses | (9) | (15)
US Treasury Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 11,301 | 157,264
Securities available for sale, less than 12 months, unrealized losses | (39) | (4,353)
Securities available for sale, 12 months or longer, fair value | 132,373 | 0
Securities available for sale, 12 months or longer, unrealized losses | (1,970) | 0
Securities available for sale, total fair value | 143,674 | 157,264
Securities available for sale, total unrealized losses | (2,009) | (4,353)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 13,165 | 12,347
Securities available for sale, less than 12 months, unrealized losses | (261) | (192)
Securities available for sale, 12 months or longer, fair value | 5,391 | 0
Securities available for sale, 12 months or longer, unrealized losses | (289) | 0
Securities available for sale, total fair value | 18,556 | 12,347
Securities available for sale, total unrealized losses | (550) | (192)
Corporate Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 0 | 32,368
Securities available for sale, less than 12 months, unrealized losses | 0 | (2,172)
Securities available for sale, 12 months or longer, fair value | 26,249 | 2,489
Securities available for sale, 12 months or longer, unrealized losses | (2,310) | (17)
Securities available for sale, total fair value | 26,249 | 34,857
Securities available for sale, total unrealized losses | (2,310) | (2,189)
Mortgage-backed Agency Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 4,545 | 64,993
Securities available for sale, less than 12 months, unrealized losses | (167) | (8,824)
Securities available for sale, 12 months or longer, fair value | 74,476 | 18,305
Securities available for sale, 12 months or longer, unrealized losses | (16,914) | (4,225)
Securities available for sale, total fair value | 79,021 | 83,298
Securities available for sale, total unrealized losses | $ (17,081) | $ (13,049)

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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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