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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted average life 5 years 10 months 24 days 5 years
Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted average life 5 years 8 months 12 days 5 years 1 month 6 days
Minimum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 8.20% 8.20%
Prepayment speed 10.50% 14.20%
Cost to service per loan $ 64 $ 66
Minimum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) (0.00013) (0.00010)
Minimum | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.60% 9.90%
Prepayment speed 11.30% 13.90%
Recapture rate 17.10% 17.70%
Minimum | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 4.10% 4.60%
Annual advance recovery rates 18.10% 18.30%
Maximum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 12.00% 12.00%
Prepayment speed 17.70% 21.30%
Cost to service per loan $ 226 $ 257
Maximum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00022 0.00022
Maximum | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 15.70% 15.70%
Prepayment speed 14.60% 15.00%
Recapture rate 23.10% 24.20%
Maximum | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.40% 8.50%
Annual advance recovery rates 22.00% 22.00%
Weighted-average | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.30% 9.40%
Prepayment speed 12.40% 15.40%
Cost to service per loan $ 92 $ 98
Weighted-average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00012 0.00012
Weighted-average | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 11.90% 12.20%
Prepayment speed 12.50% 14.40%
Recapture rate 19.00% 19.50%
Weighted-average | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 7.40% 7.50%
Annual advance recovery rates 19.90% 19.90%