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Investment Securities - Schedule of Securitization of Investments (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Securitization investments $ 93,647 $ 201,331
Personal loans    
Variable Interest Entity [Line Items]    
Securitization investments 9,934 20,172
Student Loans    
Variable Interest Entity [Line Items]    
Securitization investments $ 83,713 $ 181,159