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Asset-Backed Securities Issued - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]      
VIE, ownership interest rate   80.00%  
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary      
Debt Instrument [Line Items]      
Amortized cost $ 210,000,000   $ 210,000,000
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary      
Debt Instrument [Line Items]      
VIE, ownership interest rate 100.00%    
Debt instrument, face amount $ 200,000,000   200,000,000
Debt discount $ 4,000,000   $ 4,000,000
Debt instrument interest rate 4.75%   4.75%
Asset-backed Securities | Freddie Mac SLST      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 205,000,000   $ 205,000,000
Contractual maturities of over five years | Asset-backed Securities      
Debt Instrument [Line Items]      
Contractual maturities of ABS (in years)     5 years