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Investment Securities - Schedule of Securitization of Investments (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Variable Interest Entity [Line Items] |  |
Securitization investments | $ 134,592 | $ 106,748
Personal loans |  |
Variable Interest Entity [Line Items] |  |
Securitization investments | 58,752 | 27,247
Student Loans |  |
Variable Interest Entity [Line Items] |  |
Securitization investments | $ 75,840 | $ 79,501

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