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Fair Value of Financial Assets and Liabilities - Summary of Adverse Changes in Estimates for Securitization Notes and Residual Trust Certificates (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Jun. 30, 2022
Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securitization notes and residual trust certificates, effect of 25% increase (decrease) in measurement input $ (218) $ (1,410)
Securitization notes and residual trust certificates, effect of 50% increase (decrease) in measurement input (429) (2,295)
Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securitization notes and residual trust certificates, effect of 25% increase (decrease) in measurement input (165) (729)
Securitization notes and residual trust certificates, effect of 50% increase (decrease) in measurement input (243) (964)
Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securitization notes and residual trust certificates, effect of 25% increase (decrease) in measurement input (30) (545)
Securitization notes and residual trust certificates, effect of 50% increase (decrease) in measurement input $ (59) $ (519)