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Fair Values of Financial Instruments (Fair Value Measurements, Recurring) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities Available for Sale | $ 86,966 | $ 87,769 |
Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities Available for Sale | 86,966 | 87,769 |
Marketable Equities | 9,223 | 9,093 |
Total Securities | 96,189 | 96,862 |
(Level 1) Quoted Prices In Active Markets For Identical Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities Available for Sale |  |  |
Marketable Equities | 9,223 | 9,093 |
(Level 1) Quoted Prices In Active Markets For Identical Assets [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities Available for Sale |  |  |
Marketable Equities | 9,223 | 9,093 |
Total Securities | 9,223 | 9,093 |
(Level 2) Significant Other Observable Inputs [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities Available for Sale | 86,966 | 87,769 |
Marketable Equities |  |  |
(Level 2) Significant Other Observable Inputs [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities Available for Sale | 86,966 | 87,769 |
Marketable Equities |  |  |
Total Securities | $ 86,966 | $ 87,769 |

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