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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
MSR(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(3) 8 years 1 month 6 days 8 years 1 month 6 days
Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(3) 6 years 6 months 6 years 7 months 6 days
Min | MSR(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 10.30% 10.40%
Prepayment speed 6.30% 6.30%
Cost to service per loan(2) $ 56 $ 54
Min | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0 (0.006)
Min | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 9.90% 10.00%
Prepayment speed 7.40% 6.90%
Min | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 5.20% 5.20%
Annual advance recovery rates 15.90% 15.90%
Min | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 0.450 $ 0.373
Max | MSR(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 13.60% 13.70%
Prepayment speed 13.20% 12.20%
Cost to service per loan(2) $ 161 $ 155
Max | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0.038 0.039
Max | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 13.70% 13.80%
Prepayment speed 14.10% 13.30%
Max | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.50% 8.60%
Annual advance recovery rates 20.70% 20.60%
Max | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 1.036 $ 1.147
Weighted Average | MSR(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 11.40% 11.40%
Prepayment speed 7.50% 7.20%
Cost to service per loan(2) $ 85 $ 80
Weighted Average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0.021 0.023
Weighted Average | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Discount rate 11.20% 11.30%
Prepayment speed 9.60% 9.20%
Weighted Average | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 6.80% 7.10%
Annual advance recovery rates 17.50% 17.30%
Weighted Average | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 0.777 $ 0.774