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Fair Value Measurements - Schedule of Sensitivity in the Fair Value of Other Asset-Backed Securities to Adverse Changes in Key Assumptions (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 4,046,761 | $ 3,706,709
Other asset-backed securities related to Structured Program transactions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 257,820 | 219,370
Discount rate: |  |
100 basis point increase | (2,706) | (2,285)
200 basis point increase | (5,361) | (4,529)
Annualized net charge-off rate: |  |
10% increase | (2,793) | (2,077)
20% increase | (5,617) | (4,112)
Annualized prepayment rate: |  |
10% increase | (1,148) | (674)
20% increase | $ (2,136) | $ (1,227)
Other asset-backed securities related to Structured Program transactions | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Expected remaining weighted-average life (in years) | 1 year 1 month 6 days | 1 year 2 months 12 days

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