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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, 2022
Minimum | Discount rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.1000
Minimum | Loss rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.0075
Minimum | Prepayment rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.0800
Maximum | Discount rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.1000
Maximum | Loss rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.0075
Maximum | Prepayment rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.0800
Weighted Average | Discount rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.1000
Weighted Average | Loss rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.0075
Weighted Average | Prepayment rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residual trust certificates, measurement input 0.0800