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Borrowings - Schedule of Financing Liabilities (Footnote) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 18, 2018
Sep. 01, 2017
Jan. 31, 2018
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]              
Receipt of lump-sum cash payments           $ 279,586  
Proceeds from sale of MSRs accounted for as a financing         $ 0 279,586 $ 54,601
IndyMac Mortgage Loan Trust (INDX 2004-AR11) | Minimum              
Debt Instrument [Line Items]              
Debt instrument, interest rate (percentage)         3.39%    
IndyMac Mortgage Loan Trust (INDX 2004-AR11) | Maximum              
Debt Instrument [Line Items]              
Debt instrument, interest rate (percentage)         3.85%    
Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11) | Minimum              
Debt Instrument [Line Items]              
Debt instrument, interest rate (percentage)         4.25%    
Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11) | Maximum              
Debt Instrument [Line Items]              
Debt instrument, interest rate (percentage)         5.75%    
Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11) | LIBOR              
Debt Instrument [Line Items]              
Interest rate (percentage)         0.45%    
2017 Agreements and New RMSR Agreements              
Debt Instrument [Line Items]              
Receipt of lump-sum cash payments           279,586  
2017 Agreements and New RMSR Agreements | Financing Liability - MSRs Pledged              
Debt Instrument [Line Items]              
Receipt of lump-sum cash payments       $ (54,600)      
NRZ              
Debt Instrument [Line Items]              
Proceeds from sale of MSRs accounted for as a financing $ 279,600 $ 54,600 $ 279,600     $ 54,600