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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
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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)

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