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Fair Value Measurements - Schedule of Significant Unobservable Inputs Used in the Fair Value Measurement of Senior Asset-Backed Securities (Details) - Senior asset-backed securities related to Structured Program transactions - Discount rate | Jun. 30, 2026 | Dec. 31, 2025
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Minimum |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.053 | 0.050
Maximum |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.068 | 0.054
Weighted Average |  |
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items] |  |
Measurement input, debt securities available-for-sale | 0.056 | 0.052

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