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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(4) 7 years 10 months 24 days 8 years 1 month 6 days
Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(4) 6 years 4 months 24 days 6 years 7 months 6 days
Min | MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 6.80%  
Discount rate   10.40%
Prepayment speed 6.50% 6.30%
Cost to service per loan(3) $ 56 $ 54
Min | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 0.450 $ 0.373
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]    
Option adjusted spread(2) 6.80%  
Discount rate   10.00%
Prepayment speed 7.30% 6.90%
Min | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 5.60% 5.20%
Annual advance recovery rates 14.00% 15.90%
Max | MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 12.00%  
Discount rate   13.70%
Prepayment speed 12.70% 12.20%
Cost to service per loan(3) $ 157 $ 155
Max | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 1.021 $ 1.147
Max | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0.040 0.039
Max | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 12.00%  
Discount rate   13.80%
Prepayment speed 13.70% 13.30%
Max | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 8.80% 8.60%
Annual advance recovery rates 17.20% 20.60%
Weighted Average | MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 8.00%  
Discount rate   11.40%
Prepayment speed 7.60% 7.20%
Cost to service per loan(3) $ 83 $ 80
Weighted Average | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 0.775 $ 0.774
Weighted Average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0.020 0.023
Weighted Average | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 8.50%  
Discount rate   11.30%
Prepayment speed 9.70% 9.20%
Weighted Average | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 7.00% 7.10%
Annual advance recovery rates 15.00% 17.30%