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Borrowings - Schedule of Financing Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
HMBS-related borrowings $ 6,323,091 $ 6,063,435
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 623,049 972,595
Total Financing liabilities 6,946,140 7,036,030
Financing liability – MSRs pledged    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 601,684 950,593
Financing liability – MSRs pledged | Original Rights to MSRs Agreements    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 591,705 603,046
Financing liability – MSRs pledged | 2017 Agreements and New RMSR Agreements    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 9,979 35,445
Financing liability – MSRs pledged | PMC MSR Agreements    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 0 312,102
IndyMac Mortgage Loan Trust    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 9,544 9,794
Residential Asset Securitization Trust    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) 11,821 12,208
Financing Liability Owed to Securitization Investors    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value (amounts related to VIEs of $21,365 and $22,002) $ 21,365 $ 22,002
London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.99% 1.76%
Financing Liabilities | London Interbank Offered Rate (LIBOR)    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.60%