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Fair Value of Financial Instruments - Schedule of Reconciliation of Loans Receivable at Fair Value Using Significant Unobservable Inputs (Details) - Loans receivable at fair value - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance – beginning of period | $ 2,778,523 | $ 2,962,352
Principal disbursements | 659,398 | 584,162
Principal and interest payments from members | (581,607) | (596,033)
Other loan sales | 0 | (34,857)
Gross charge-offs | (98,197) | (103,037)
Net increase (decrease) in fair value | 12,369 | 28,938
Balance – end of period | $ 2,770,486 | $ 2,841,525

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