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Borrowings - Schedule of Financing Liabilities (Footnote) (Details)
Sep. 30, 2020
London Interbank Offered Rate (LIBOR) | Financing Liability Owed to Securitization Investors  
Debt Instrument [Line Items]  
Weighted average interest rate 0.45%
Minimum | Residential Asset Securitization Trust  
Debt Instrument [Line Items]  
Weighted average interest rate 4.25%
Maximum | Residential Asset Securitization Trust  
Debt Instrument [Line Items]  
Weighted average interest rate 5.75%