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Fair Values of Financial Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transfers between fair value hierarchy | $ 0 | $ 0 |  |
Total Loans Receivable | 3,265,145,000 | 3,265,971,000 | $ 3,317,402,000 |
Allowance for credit losses | 34,563,000 | $ 28,882,000 | 33,608,000 | $ 32,373,000
Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities | 0 |  | 0 |
Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Losses (recoveries) on impaired loans | 878,000,000,000 |  | 1,400,000 |
(Level 3) Significant Unobservable Inputs [Member] | Impaired Loans [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Loans Receivable | 28,700,000 |  | 27,800,000 |
Allowance for credit losses | $ 5,100,000 |  | $ 4,200,000 |

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