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Borrowings - Schedule of Financing Liabilities (Footnote) (Details) - Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11)
12 Months Ended
Dec. 31, 2020
Minimum  
Debt Instrument [Line Items]  
Debt instrument, interest rate (percentage) 4.25%
Maximum  
Debt Instrument [Line Items]  
Debt instrument, interest rate (percentage) 5.75%
LIBOR  
Debt Instrument [Line Items]  
Interest rate (percentage) 0.45%