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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available for sale, amortized cost | $ 324,887 | $ 320,123 |
Securities available for sale, unrealized gains | 32 | 24 |
Securities available for sale, unrealized losses | (16,650) | (19,798) |
Securities available for sale, fair value | 308,269 | 300,349 | [1]
US Government Agencies Debt Securities [Member] |  |  |
Securities available for sale, amortized cost | 1,500 | 1,500 |
Securities available for sale, unrealized gains | 0 | 0 |
Securities available for sale, unrealized losses | (9) | (15) |
Securities available for sale, fair value | 1,491 | 1,485 |
US Treasury Securities [Member] |  |  |
Securities available for sale, amortized cost | 174,052 | 161,617 |
Securities available for sale, unrealized gains | 3 | 0 |
Securities available for sale, unrealized losses | (3,369) | (4,353) |
Securities available for sale, fair value | 170,686 | 157,264 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities available for sale, amortized cost | 23,012 | 23,480 |
Securities available for sale, unrealized gains | 25 | 21 |
Securities available for sale, unrealized losses | (80) | (192) |
Securities available for sale, fair value | 22,957 | 23,309 |
Corporate Debt Securities [Member] |  |  |
Securities available for sale, amortized cost | 31,543 | 37,046 |
Securities available for sale, unrealized gains | 0 | 0 |
Securities available for sale, unrealized losses | (1,764) | (2,189) |
Securities available for sale, fair value | 29,779 | 34,857 |
Mortgage-backed Agency Securities [Member] |  |  |
Securities available for sale, amortized cost | 94,780 | 96,480 |
Securities available for sale, unrealized gains | 4 | 3 |
Securities available for sale, unrealized losses | (11,428) | (13,049) |
Securities available for sale, fair value | $ 83,356 | $ 83,434 |
[1] | Derived from audited financial statements

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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