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Investments in Securities and Fair Value Investments in Securities (Schedule of Variable Interest Entities) (Details) - Other Investments $ in Thousands | Dec. 31, 2023 USD ($)
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Variable Interest Entity [Line Items] |
Variable Interest Entity Nonconsolidated Carrying Amount | $ 13,510
Variable Interest Entity, Nonconsolidated, Estimated Fair Value | 14,366
Variable Interest Entity, Reporting Entity Involvement, Maximum Potential Loss | 18,140
Real estate LLCs or LPs |
Variable Interest Entity [Line Items] |
Variable Interest Entity Nonconsolidated Carrying Amount | 13,310
Variable Interest Entity, Nonconsolidated, Estimated Fair Value | 14,166
Variable Interest Entity, Reporting Entity Involvement, Maximum Potential Loss | 18,060
Small business investment LLCs or LPs |
Variable Interest Entity [Line Items] |
Variable Interest Entity Nonconsolidated Carrying Amount | 200
Variable Interest Entity, Nonconsolidated, Estimated Fair Value | 200
Variable Interest Entity, Reporting Entity Involvement, Maximum Potential Loss | $ 80

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