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Borrowings - Schedule of Financing Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
HMBS-related borrowings $ 6,772,711 $ 6,063,435 $ 5,380,448 $ 4,601,556
Other financing liabilities 576,722 972,595    
Financing Liabilities        
Debt Instrument [Line Items]        
HMBS-related borrowings 6,772,711 6,063,435    
Other financing liabilities 566,952 950,593    
Long-term debt, gross 7,349,433 7,036,030    
IndyMac Mortgage Loan Trust (INDX 2004-AR11) | Financing Liabilities        
Debt Instrument [Line Items]        
Other financing liabilities 0 9,794    
Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11) | Financing Liabilities        
Debt Instrument [Line Items]        
Other financing liabilities 9,770 12,208    
Financing Liability Owed to Securitization Investors | Financing Liabilities        
Debt Instrument [Line Items]        
Other financing liabilities $ 9,770 22,002    
LIBOR | Financing Liabilities        
Debt Instrument [Line Items]        
Interest rate (percentage) 2.45%      
LIBOR | Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11)        
Debt Instrument [Line Items]        
Interest rate (percentage) 0.45%      
Original Rights to MSRs Agreements | Financing Liabilities        
Debt Instrument [Line Items]        
Other financing liabilities $ 566,952 603,046    
2017 Agreements and New RMSR Agreements | Financing Liabilities        
Debt Instrument [Line Items]        
Other financing liabilities 0 35,445    
PHH MSR Agreements | Financing Liabilities        
Debt Instrument [Line Items]        
Other financing liabilities $ 0 $ 312,102