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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | [2]
--- | --- | --- | --- | ---
Securities available for sale, due within one year, amortized cost | $ 45,093 |  |  |
Securities available for sale, due after one year but within five years, amortized cost | 175,766 |  |  |
Securities available for sale, due after five years but within ten years, amortized cost | 2,784 |  |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |  |
Securities available for sale, single maturity date, amortized cost | 223,643 |  |  |
Securities available for sale, no single maturity date, amortized cost | 96,480 |  |  |
Securities available for sale, amortized cost | 320,123 | $ 76,273 |  |
Securities available for sale, due within one year, fair value | 44,787 |  |  |
Securities available for sale, due after one year but within five years, fair value | 169,354 |  |  |
Securities available for sale, due after five years but within ten years, fair value | 2,774 |  |  |
Securities available for sale, due after ten years, fair value | 0 |  |  |
Securities available for sale, single maturity date, fair value | 216,915 |  |  |
Securities available for sale, no single maturity date, fair value | 83,434 |  |  |
Securities available for sale | 300,349 | 76,292 | [1] | $ 83,358
US Government Agencies Debt Securities [Member] |  |  |  |
Securities available for sale, due within one year, amortized cost | 1,500 |  |  |
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 | 1,500 |  |  |
Securities available for sale, amortized cost | 1,500 | 469 |  |
Securities available for sale, due within one year, fair value | 1,485 |  |  |
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 | 1,485 |  |  |
Securities available for sale | 1,485 | 466 |  |
US Treasury Securities [Member] |  |  |  |
Securities available for sale, due within one year, amortized cost | 32,013 |  |  |
Securities available for sale, due after one year but within five years, amortized cost | 129,604 |  |  |
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 | 161,617 |  |  |
Securities available for sale, amortized cost | 161,617 |  |  |
Securities available for sale, due within one year, fair value | 31,786 |  |  |
Securities available for sale, due after one year but within five years, fair value | 125,478 |  |  |
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 | 157,264 |  |  |
Securities available for sale | 157,264 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Securities available for sale, due within one year, amortized cost | 3,070 |  |  |
Securities available for sale, due after one year but within five years, amortized cost | 17,626 |  |  |
Securities available for sale, due after five years but within ten years, amortized cost | 2,784 |  |  |
Securities available for sale, due after ten years, amortized cost | 0 |  |  |
Securities available for sale, single maturity date, amortized cost | 23,480 |  |  |
Securities available for sale, amortized cost | 23,480 | 28,596 |  |
Securities available for sale, due within one year, fair value | 3,068 |  |  |
Securities available for sale, due after one year but within five years, fair value | 17,467 |  |  |
Securities available for sale, due after five years but within ten years, fair value | 2,774 |  |  |
Securities available for sale, due after ten years, fair value | 0 |  |  |
Securities available for sale, single maturity date, fair value | 23,309 |  |  |
Securities available for sale | 23,309 | 28,794 |  |
Corporate Debt Securities [Member] |  |  |  |
Securities available for sale, due within one year, amortized cost | 8,510 |  |  |
Securities available for sale, due after one year but within five years, amortized cost | 28,536 |  |  |
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 | 37,046 |  |  |
Securities available for sale, amortized cost | 37,046 | 9,935 |  |
Securities available for sale, due within one year, fair value | 8,448 |  |  |
Securities available for sale, due after one year but within five years, fair value | 26,409 |  |  |
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 | 34,857 |  |  |
Securities available for sale | $ 34,857 | $ 9,919 |  |
[1] | Derived from audited financial statements
[2] | Per our analysis no ACL was necessary for investment securities available for sale.

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