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Short-Term Debt and Long-term Debt (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Financing receivables | $ 3,279,708,000 | $ 3,045,331,000 |
Securities pledged as collateral | 0 | 0 |
Net Of Unamortized Prepayment Penalties | $ 988,000 |  |
Unamortized prepayment penalties |  | 1,500,000 | $ 2,100,000
Maximum ratio of debt to total assets under debt covenant | 50.00% |  |
Maximum total debt under debt covenant | $ 1,916,000,000 |  |
Asset Pledged as Collateral [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Financing receivables | 1,700,000,000 | $ 1,200,000,000 |
FHLB Advances Due In 2021 Through 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt extinguished | $ 115,000,000.0 |  |
Weighted average interest rate | 1.60% |  |
Increase (decrease) in weighted average interest rate | (0.16%) |  |

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