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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted average life 5 years 6 months 5 years
Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Weighted average life 5 years 4 months 24 days 5 years 1 month 6 days
Minimum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.50% 8.20%
Prepayment speed 12.40% 14.20%
Cost to service per loan(1) $ 63 $ 66
Minimum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) (0.00007) (0.00010)
Minimum | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.50% 9.90%
Prepayment speed 12.60% 13.90%
Recapture rate 13.70% 17.70%
Minimum | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 5.30% 4.60%
Annual advance recovery rates 18.90% 18.30%
Maximum | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 13.80% 12.00%
Prepayment speed 18.80% 21.30%
Cost to service per loan(1) $ 223 $ 257
Maximum | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00023 0.00022
Maximum | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 13.80% 15.70%
Prepayment speed 15.30% 15.00%
Recapture rate 29.50% 24.20%
Maximum | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.20% 8.50%
Annual advance recovery rates 22.70% 22.00%
Weighted-average | Forward MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 11.00% 9.40%
Prepayment speed 13.60% 15.40%
Cost to service per loan(1) $ 86 $ 98
Weighted-average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00014 0.00012
Weighted-average | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 11.20% 12.20%
Prepayment speed 13.50% 14.40%
Recapture rate 21.30% 19.50%
Weighted-average | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 6.90% 7.50%
Annual advance recovery rates 20.80% 19.90%