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Securitization and Variable Interest Entities - Schedule of Securitization of Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Investments in available-for-sale securities, fair value | $ 3,993,310 | $ 2,454,453
Asset-backed bonds |  |
Variable Interest Entity [Line Items] |  |
Investments in available-for-sale securities, fair value | 12,441 | 19,703
Residual investments |  |
Variable Interest Entity [Line Items] |  |
Investments in available-for-sale securities, fair value | 3,334 | 3,770
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Securitization investments | 248,117 | 144,627
Variable Interest Entity, Not Primary Beneficiary | Personal loans |  |
Variable Interest Entity [Line Items] |  |
Securitization investments | 223,978 | 117,322
Variable Interest Entity, Not Primary Beneficiary | Student loans |  |
Variable Interest Entity [Line Items] |  |
Securitization investments | $ 24,139 | $ 27,305

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