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Fair Value Measurements - Unobservable Inputs (Details) - USD ($)
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(4) 8 years 2 months 12 days 8 years 1 month 6 days
Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average life(4) 6 years 8 months 12 days 6 years 7 months 6 days
Min | MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 6.90%  
Discount rate   10.40%
Prepayment speed 6.10% 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) 0.008 (0.006)
Min | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 7.00%  
Discount rate   10.00%
Prepayment speed 7.50% 6.90%
Min | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 6.50% 5.20%
Annual advance recovery rates 12.60% 15.90%
Max | MSRs(1)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 12.30%  
Discount rate   13.70%
Prepayment speed 9.80% 12.20%
Cost to service per loan(3) $ 151 $ 155
Max | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 0.995 $ 1.147
Max | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0.046 0.039
Max | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 12.30%  
Discount rate   13.80%
Prepayment speed 10.50% 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 15.40% 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 7.00% 7.20%
Cost to service per loan(3) $ 80 $ 80
Weighted Average | Mortgage loans held for sale    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market pricing $ 0.883 $ 0.774
Weighted Average | IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Value of servicing (reflected as a percentage of loan commitment) 0.019 0.023
Weighted Average | Excess spread financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Option adjusted spread(2) 8.80%  
Discount rate   11.30%
Prepayment speed 8.50% 9.20%
Weighted Average | Mortgage servicing rights financing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Advance financing and counterparty fee rates 7.70% 7.10%
Annual advance recovery rates 13.50% 17.30%