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Borrowings - Schedule of Financing Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
HMBS-related borrowings $ 6,778,195 $ 6,772,711 $ 6,323,091 $ 6,063,434
Other financing liabilities, at fair value 559,184 576,722    
Total Financing liabilities 7,337,379 7,349,433    
Residential Asset Securitization Trust        
Debt Instrument [Line Items]        
Other financing liabilities, at fair value 8,820 9,770    
Secured Debt        
Debt Instrument [Line Items]        
Total Financing liabilities 457,354 438,566    
Secured Debt | Mortgage Loan Warehouse Facilities        
Debt Instrument [Line Items]        
Total Financing liabilities 609,432 451,713    
Master Repurchase Agreement | Secured Debt        
Debt Instrument [Line Items]        
Total Financing liabilities 0 0    
Mortgage Warehouse Agreement | Secured Debt        
Debt Instrument [Line Items]        
Total Financing liabilities 14,958 11,715    
Mortgage Warehouse Agreement | Secured Debt        
Debt Instrument [Line Items]        
Total Financing liabilities $ 99,481 73,134    
Total Servicing Lines of Credit | Mortgage Loan Warehouse Facilities        
Debt Instrument [Line Items]        
Interest rate (as a percent) 4.77%      
Original Rights to MSRs Agreements | Financing Liability - MSRs Pledged        
Debt Instrument [Line Items]        
Other financing liabilities, at fair value $ 550,364 $ 566,952    
London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.11% 0.14%    
London Interbank Offered Rate (LIBOR) | HMBS-Related Borrowings        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.45%      
London Interbank Offered Rate (LIBOR) | Residential Asset Securitization Trust        
Debt Instrument [Line Items]        
Basis spread on variable rate 0.45%      
London Interbank Offered Rate (LIBOR) | Master Repurchase Agreement | Secured Debt        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.90%      
Interest rate at index floor rate 0.25%      
London Interbank Offered Rate (LIBOR) | Mortgage Warehouse Agreement | Secured Debt        
Debt Instrument [Line Items]        
Basis spread on variable rate 3.50%      
Interest rate at index floor rate 5.25%      
London Interbank Offered Rate (LIBOR) | Mortgage Warehouse Agreement | Secured Debt        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.50%      
Interest rate at index floor rate 3.25%      
London Interbank Offered Rate (LIBOR) | Ginnie Mae Mortgage Servicing Rights Financing Facility | Secured Debt | Mortgage Loan Warehouse Facilities        
Debt Instrument [Line Items]        
Basis spread on variable rate 4.50%      
Interest rate at index floor rate 0.50%      
London Interbank Offered Rate (LIBOR) | Minimum | Residential Asset Securitization Trust        
Debt Instrument [Line Items]        
Debt instrument, interest rate 4.25%      
London Interbank Offered Rate (LIBOR) | Maximum | Residential Asset Securitization Trust        
Debt Instrument [Line Items]        
Debt instrument, interest rate 5.75%