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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2021 | [1]
--- | --- | --- | --- | ---
Securities available for sale, due within one year, amortized cost | $ 157,521 |  |
Securities available for sale, due after one year but within five years, amortized cost | 42,976 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 0 |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |
Securities available for sale, single maturity date, amortized cost | 200,497 |  |
Securities available for sale, no single maturity date, amortized cost | 94,548 |  |
Securities available for sale, amortized cost | 295,045 | $ 320,123 |
Securities available for sale, due within one year, fair value | 156,691 |  |
Securities available for sale, due after one year but within five years, fair value | 41,342 |  |
Securities available for sale, due after five years but within ten years, fair value | 0 |  |
Securities available for sale, due after ten years, fair value | 0 |  |
Securities available for sale, single maturity date, fair value | 198,033 |  |
Securities available for sale, no single maturity date, fair value | 82,928 |  |
Securities available for sale | 280,961 | 300,349 | $ 83,358
US Government Agencies Debt Securities [Member] |  |  |
Securities available for sale, due within one year, amortized cost | 5,750 |  |
Securities available for sale, due after one year but within five years, amortized cost | 0 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 0 |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |
Securities available for sale, single maturity date, amortized cost | 5,750 |  |
Securities available for sale, amortized cost | 5,750 | 1,500 |
Securities available for sale, due within one year, fair value | 5,749 |  |
Securities available for sale, due after one year but within five years, fair value | 0 |  |
Securities available for sale, due after five years but within ten years, fair value | 0 |  |
Securities available for sale, due after ten years, fair value | 0 |  |
Securities available for sale, single maturity date, fair value | 5,749 |  |
Securities available for sale | 5,749 | 1,485 |
US Treasury Securities [Member] |  |  |
Securities available for sale, due within one year, amortized cost | 146,653 |  |
Securities available for sale, due after one year but within five years, amortized cost | 0 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 0 |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |
Securities available for sale, single maturity date, amortized cost | 146,653 |  |
Securities available for sale, amortized cost | 146,653 | 161,617 |
Securities available for sale, due within one year, fair value | 145,826 |  |
Securities available for sale, due after one year but within five years, fair value | 0 |  |
Securities available for sale, due after five years but within ten years, fair value | 0 |  |
Securities available for sale, due after ten years, fair value | 0 |  |
Securities available for sale, single maturity date, fair value | 145,826 |  |
Securities available for sale | 145,826 | 157,264 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities available for sale, due within one year, amortized cost | 5,118 |  |
Securities available for sale, due after one year but within five years, amortized cost | 14,410 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 0 |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |
Securities available for sale, single maturity date, amortized cost | 19,528 |  |
Securities available for sale, amortized cost | 19,528 | 23,480 |
Securities available for sale, due within one year, fair value | 5,116 |  |
Securities available for sale, due after one year but within five years, fair value | 14,261 |  |
Securities available for sale, due after five years but within ten years, fair value | 0 |  |
Securities available for sale, due after ten years, fair value | 0 |  |
Securities available for sale, single maturity date, fair value | 19,377 |  |
Securities available for sale | 19,377 | 23,309 |
Corporate Debt Securities [Member] |  |  |
Securities available for sale, due within one year, amortized cost | 0 |  |
Securities available for sale, due after one year but within five years, amortized cost | 28,566 |  |
Securities available for sale, due after five years but within ten years, amortized cost | 0 |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |
Securities available for sale, single maturity date, amortized cost | 28,566 |  |
Securities available for sale, amortized cost | 28,566 | 37,046 |
Securities available for sale, due within one year, fair value | 0 |  |
Securities available for sale, due after one year but within five years, fair value | 27,081 |  |
Securities available for sale, due after five years but within ten years, fair value | 0 |  |
Securities available for sale, due after ten years, fair value | 0 |  |
Securities available for sale, single maturity date, fair value | 27,081 |  |
Securities available for sale | $ 27,081 | $ 34,857 |
[1] | Per our analysis no ACL was necessary for investment securities available for sale.

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