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Mortgage Servicing Rights and Related Liabilities - Fair Value Assumptions (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mortgage Servicing Rights    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.70% 10.20%
Prepayment speeds 13.10% 10.80%
Expected weighted-average life (in years) 5 years 9 months 6 years 8 months
Mortgage Servicing Rights | Credit sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 10.40% 11.30%
Prepayment speeds 12.70% 11.80%
Expected weighted-average life (in years) 6 years 6 years 5 months
Mortgage Servicing Rights | Interest sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.10% 9.30%
Prepayment speeds 13.50% 10.00%
Expected weighted-average life (in years) 5 years 8 months 7 years
Excess Spread Financing    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 11.60% 10.40%
Prepayment speeds 12.60% 11.00%
Recapture rate 20.10% 18.60%
Average life 5 years 9 months 6 years 6 months
Financing rates | MSR Financing Liability    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates 3.50% 4.20%
Recovery rates | MSR Financing Liability    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates 18.80% 19.00%