Fair Value Measurements - Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 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)	4,241	537
Included in other comprehensive income	48	0
Settlements	4,810	823
Transfers into level 3	0	0
Transfers out of level 3	0	0
Balance, end of period	63,580	52,146
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at the end of the reporting period	48	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	4,233	537
Interest Income - Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in earnings (or changes in net assets)	8	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)	4,233	537
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)	8	0
Included in other comprehensive income	48	0
Settlements	3,051	0
Transfers into level 3	0	0
Transfers out of level 3	0	0
Balance, end of period	3,107	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	48	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)	4,233	537
Included in other comprehensive income	0	0
Settlements	1,759	823
Transfers into level 3	0	0
Transfers out of level 3	0	0
Balance, end of period	60,473	52,146
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	$ 4,233	$ 537