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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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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