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Fair Value Measurements and Fair Values of Financial Instruments (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans |  | $ 8,371,000 |
Valuation allowance |  | 2,784,000 |
Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities | $ 0 | 0 |
Individually Evaluated Loans [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Losses (recoveries) on impaired loans | 1,400,000 | (5,000,000.0) | $ 5,700,000
(Level 3) Significant Unobservable Inputs [Member] | Individually Evaluated Loans [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 27,800,000 | 8,400,000 |
Valuation allowance | $ 4,200,000 | $ 2,800,000 |

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