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Mortgage Servicing Rights and Related Liabilities - Fair Value Assumptions (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Mortgage servicing rights    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.50% 9.70%
Prepayment speeds 14.20% 13.10%
Average life 5 years 3 months 18 days 5 years 9 months 18 days
Mortgage servicing rights | Credit sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.90% 10.40%
Prepayment speeds 12.60% 12.70%
Average life 5 years 7 months 6 days 6 years
Mortgage servicing rights | Interest sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.00% 9.10%
Prepayment speeds 15.80% 13.50%
Average life 4 years 10 months 24 days 5 years 8 months 12 days
Excess spread financing | Weighted-average    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 12.00% 11.60%
Prepayment speeds 13.40% 12.60%
Recapture rate 18.70% 20.10%
Average life 5 years 4 months 24 days 5 years 9 months 18 days
MSR financing liability | Advance financing rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates 4.30% 3.50%
MSR financing liability | Annual advance recovery rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates 18.60% 18.80%
Agency | Mortgage servicing rights    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 8.90% 9.00%
Prepayment speeds 14.40% 13.00%
Average life 5 years 2 months 12 days 5 years 9 months 18 days
Non-agency | Mortgage servicing rights    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 12.00% 12.60%
Prepayment speeds 13.40% 13.80%
Average life 5 years 7 months 6 days 6 years 2 months 12 days