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Fair Value Measurements - Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 54,481 $ 50,786
Included in earnings (or changes in net assets) 412 2,016
Included in other comprehensive income 83 0
Settlements 2,774 (241)
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period 57,750 52,561
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period 83 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period 398 2,016
Interest Income - Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in earnings (or changes in net assets) 14 0
Gains (losses) on securities, net    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in earnings (or changes in net assets) 398 2,016
Available For Sale - Debt Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 0 0
Included in earnings (or changes in net assets) 14 0
Included in other comprehensive income 83 0
Settlements 2,813 0
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period 2,910 0
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period 83 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period 0 0
Trading - Residual Interests    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 54,481 50,786
Included in earnings (or changes in net assets) 398 2,016
Included in other comprehensive income 0 0
Settlements (39) (241)
Transfers into level 3 0 0
Transfers out of level 3 0 0
Balance, end of period 54,840 52,561
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period 0 0
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets held at the end of the reporting period $ 398 $ 2,016