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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Fair Value Assumptions (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mortgage servicing rights | Credit sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 11.30% 11.30%
Total prepayment speeds 13.50% 11.80%
Expected weighted-average life 5 years 11 months 16 days 6 years 5 months
Mortgage servicing rights | Interest sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.40% 9.30%
Total prepayment speeds 12.50% 10.00%
Expected weighted-average life 6 years 1 month 7 years
Excess spread financing | Low    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds 6.80% 6.00%
Average Life (Years) 4 years 8 months 4 days 5 years
Discount Rate 8.50% 8.50%
Recapture Rate 7.90% 8.50%
Excess spread financing | High    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds 18.30% 16.70%
Average Life (Years) 7 years 1 month 28 days 8 years 1 month
Discount Rate 13.90% 13.90%
Recapture Rate 33.10% 30.50%
Excess spread financing | Weighted-average    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds 12.90% 11.00%
Average Life (Years) 5 years 11 months 4 days 6 years 6 months
Discount Rate 10.40% 10.40%
Recapture Rate 20.40% 18.60%
MSR Financing Liability | Financing rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates 3.90%  
MSR Financing Liability | Recovery rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates 19.30%  
Predecessor | MSR Financing Liability | Financing rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates   4.20%
Predecessor | MSR Financing Liability | Recovery rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates   19.00%