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Fair Value of Financial Assets and Liabilities - Quantitative Information About Significant Unobservable Inputs for Residual Trust Certificates (Details) - Residual Trust Certificates Held by Third-Parties in Consolidated VIEs	Jun. 30, 2023	Jun. 30, 2022
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.1000	0.1000
Minimum | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0092	0.0075
Minimum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0770	0.0800
Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.1000	0.1000
Maximum | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0092	0.0075
Maximum | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0770	0.0800
Weighted Average (3) | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.1000	0.1000
Weighted Average (3) | Loss rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0092	0.0075
Weighted Average (3) | Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual trust certificates, measurement input	0.0770	0.0800

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