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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Minimum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 8.30%  
Prepayment speeds 12.60%  
Cost to service per loan $ 68  
Minimum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) (0.00004)  
Minimum | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.80%  
Prepayment speeds 13.40%  
Recapture rate 17.10%  
Average life 5 years 2 months 12 days  
Minimum | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 6.40%  
Annual advance recovery rates 18.60%  
Maximum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 12.00%  
Prepayment speeds 19.20%  
Cost to service per loan $ 295  
Maximum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00021  
Maximum | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 15.50%  
Prepayment speeds 14.00%  
Recapture rate 23.50%  
Average life 5 years 6 months  
Maximum | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 9.40%  
Annual advance recovery rates 22.60%  
Weighted-average | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.50%  
Prepayment speeds 14.40%  
Cost to service per loan $ 105  
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 11.90% 11.60%
Prepayment speeds 13.60% 12.60%
Recapture rate 19.10% 20.10%
Average life 5 years 3 months 18 days 5 years 9 months 18 days
Weighted-average | MSR financing liability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.20% 8.90%
Annual advance recovery rates 20.20% 18.80%