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Other Financing Liabilities - Schedule of Financing Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Instrument [Line Items]      
Other financing liabilities, at fair value $ 1,152,500   $ 1,137,400
Servicing and subservicing fees 232,200 $ 212,600  
Proceeds from other financing liabilities - Excess Servicing Spread (ESS) liability 68,700 $ 0  
Other counterparties for Pledged MSR liab. | Financing Liabilities      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 4,300   700
ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 263,100   199,000
ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 883,200   931,700
Residential Asset Securitization Trust      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 6,200   6,700
Original Rights to Mortgage Servicing Rights Agreements | ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value 560,200   601,200
MAV MSR Sale Agreements | ESS Financing Liability      
Debt Instrument [Line Items]      
Other financing liabilities, at fair value $ 318,700   $ 329,800