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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Other financing liabilities, at fair value ($238,144 and $0 due to related party) ($7,879 and $9,770 related to VIEs) $ 804,963 $ 576,722
Financing Liabilities    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value ($238,144 and $0 due to related party) ($7,879 and $9,770 related to VIEs) 797,085 566,952
Residential Asset Securitization Trust 2003-A11 (RAST 2003-A11) | Financing Liabilities    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value ($238,144 and $0 due to related party) ($7,879 and $9,770 related to VIEs) 7,879 9,770
Original Rights to MSRs Agreements | Financing Liabilities    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value ($238,144 and $0 due to related party) ($7,879 and $9,770 related to VIEs) 558,940 566,952
PHH MSR Agreements | Financing Liabilities    
Debt Instrument [Line Items]    
Other financing liabilities, at fair value ($238,144 and $0 due to related party) ($7,879 and $9,770 related to VIEs) $ 238,144 $ 0