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Fair Value of Financial Assets and Liabilities - Quantitative Information About Significant Unobservable Inputs for Senior Notes and Residual Trust Certificated (Details) - Senior Notes And Residual Trust Certificates
Jun. 30, 2022
Jun. 30, 2021
Minimum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0368 0.1146
Minimum | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0061 0.0061
Minimum | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0525 0.1050
Maximum | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.2250 0.1146
Maximum | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.1095 0.0061
Maximum | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.3500 0.1050
Weighted Average | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0537 0.1146
Weighted Average | Loss rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.0265 0.0061
Weighted Average | Prepayment rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Residual trust certificates, measurement input 0.1848 0.1050