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Fair Values of Assets and Liabilities (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan
Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of impaired loans requiring a valuation allowance | loan | 41 | 33
Fair Value | $ 3,666,000 | $ 7,487,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,332,000 | 7,069,000
Impaired Loans, Cumulative Charge-Offs | $ 471,000 | $ 5,277,000
Loan [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of loans with related allowance | loan | 17 | 21
Impaired Financing Receivable, with Related Allowance, Recorded Investment | $ 403,000 | $ 553,000
Valuation allowance | 69,000 | 135,000
Impaired Loans, Cumulative Charge-Offs | $ 0 | $ 0

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