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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Minimum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 8.20%  
Prepayment speed 14.20%  
Cost to service per loan $ 66  
Minimum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) (0.00010)  
Minimum | Excess Spread Financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.90%  
Prepayment speed 13.90%  
Recapture rate 17.70%  
Minimum | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 4.60%  
Annual advance recovery rates 18.30%  
Maximum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 12.00%  
Prepayment speed 21.30%  
Cost to service per loan $ 257  
Maximum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00022  
Maximum | Excess Spread Financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 15.70%  
Prepayment speed 15.00%  
Recapture rate 24.20%  
Maximum | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.50%  
Annual advance recovery rates 22.00%  
Weighted-average | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.40% 9.70%
Prepayment speed 15.40% 13.10%
Cost to service per loan $ 98  
Weighted average life 5 years 5 years 9 months 18 days
Weighted-average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00012  
Weighted-average | Excess Spread Financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 12.20% 11.60%
Prepayment speed 14.40% 12.60%
Weighted average life 5 years 1 month 6 days 5 years 9 months 18 days
Recapture rate 19.50% 20.10%
Weighted-average | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 7.50% 8.90%
Annual advance recovery rates 19.90% 18.80%