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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(2) 7 years 4 months 24 days 5 years 9 months 18 days
Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(2) 6 years 4 months 24 days 5 years 4 months 24 days
Min | MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.50% 9.50%
Prepayment speed 7.20% 11.70%
Cost to service per loan(1) $ 57 $ 59
Min | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) (0.00004) (0.00007)
Min | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.50% 9.50%
Prepayment speed 9.10% 12.80%
Min | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 4.60% 4.50%
Annual advance recovery rates 18.90% 19.20%
Max | MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 13.70% 13.70%
Prepayment speed 14.80% 16.40%
Cost to service per loan(1) $ 128 $ 168
Max | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00026 0.00024
Max | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 13.80% 13.80%
Prepayment speed 15.10% 15.20%
Max | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.60% 7.90%
Annual advance recovery rates 26.40% 23.00%
Weighted Average | MSR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 10.70% 10.90%
Prepayment speed 8.90% 13.00%
Cost to service per loan(1) $ 74 $ 77
Weighted Average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (basis points per loan) 0.00019 0.00014
Weighted Average | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 11.20% 11.20%
Prepayment speed 10.40% 13.40%
Weighted Average | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 6.90% 6.50%
Annual advance recovery rates 20.70% 21.30%