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Mortgage Servicing Rights and Related Liabilities - Fair Value Assumptions (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mortgage Servicing Rights | Credit sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 11.30%  
Total prepayment speeds 11.80%  
Expected weighted-average life (in years) 6 years 5 months  
Mortgage Servicing Rights | Interest sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.30%  
Total prepayment speeds 10.00%  
Expected weighted-average life (in years) 7 years  
Excess Spread Financing | Low    
Assumption for Fair Value of Mortgage Servicing Rights    
Excess Spread Financing, Prepayment Speeds 6.00%  
Excess Spread Financing, Average Life (Years) 5 years  
Excess Spread Financing, Discount Rate 8.50%  
Excess Spread Financing, Recapture Rate 8.50%  
Excess Spread Financing | High    
Assumption for Fair Value of Mortgage Servicing Rights    
Excess Spread Financing, Prepayment Speeds 16.70%  
Excess Spread Financing, Average Life (Years) 8 years 1 month  
Excess Spread Financing, Discount Rate 13.90%  
Excess Spread Financing, Recapture Rate 30.50%  
Excess Spread Financing | Weighted Average    
Assumption for Fair Value of Mortgage Servicing Rights    
Excess Spread Financing, Prepayment Speeds 11.00%  
Excess Spread Financing, Average Life (Years) 6 years 6 months  
Excess Spread Financing, Discount Rate 10.40%  
Excess Spread Financing, Recapture Rate 18.60%  
Financing rates | MSR Financing Liability    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates 4.20%  
Recovery rates | MSR Financing Liability    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates 19.00%  
Predecessor | Mortgage Servicing Rights | Credit sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate   11.40%
Total prepayment speeds   15.20%
Expected weighted-average life (in years)   5 years 8 months
Predecessor | Mortgage Servicing Rights | Interest sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate   9.20%
Total prepayment speeds   10.70%
Expected weighted-average life (in years)   6 years 8 months
Predecessor | Excess Spread Financing | Low    
Assumption for Fair Value of Mortgage Servicing Rights    
Excess Spread Financing, Prepayment Speeds   6.20%
Excess Spread Financing, Average Life (Years)   4 years 4 months 24 days
Excess Spread Financing, Discount Rate   8.50%
Excess Spread Financing, Recapture Rate   7.20%
Predecessor | Excess Spread Financing | High    
Assumption for Fair Value of Mortgage Servicing Rights    
Excess Spread Financing, Prepayment Speeds   21.20%
Excess Spread Financing, Average Life (Years)   6 years 10 months 24 days
Excess Spread Financing, Discount Rate   14.10%
Excess Spread Financing, Recapture Rate   30.00%
Predecessor | Excess Spread Financing | Weighted Average    
Assumption for Fair Value of Mortgage Servicing Rights    
Excess Spread Financing, Prepayment Speeds   13.70%
Excess Spread Financing, Average Life (Years)   5 years 10 months 24 days
Excess Spread Financing, Discount Rate   10.80%
Excess Spread Financing, Recapture Rate   18.70%
Predecessor | Financing rates | MSR Financing Liability    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates   3.50%
Predecessor | Recovery rates | MSR Financing Liability    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates   23.20%