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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Fair Value Assumptions (Details)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Mortgage servicing rights | Credit sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 11.20%  
Total prepayment speeds 11.20%  
Expected weighted-average life 6 years 8 months  
Mortgage servicing rights | Interest sensitive    
Assumption for Fair Value of Mortgage Servicing Rights    
Discount rate 9.20%  
Total prepayment speeds 8.90%  
Expected weighted-average life 7 years 5 months  
Excess spread financing | Low    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds 5.90%  
Average Life (Years) 5 years 3 months 18 days  
Discount Rate 8.50%  
Recapture Rate 7.60%  
Excess spread financing | High    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds 15.00%  
Average Life (Years) 8 years 6 months  
Discount Rate 14.00%  
Recapture Rate 26.70%  
Excess spread financing | Weighted-average    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds 10.60%  
Average Life (Years) 6 years 8 months 12 days  
Discount Rate 10.60%  
Recapture Rate 17.70%  
MSR Financing Liability | Financing rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates 4.90%  
MSR Financing Liability | Recovery rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates 18.20%  
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   5 years 8 months 12 days
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   6 years 8 months 12 days
Predecessor | Excess spread financing | Low    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds   6.20%
Average Life (Years)   4 years 4 months 24 days
Discount Rate   8.50%
Recapture Rate   7.20%
Predecessor | Excess spread financing | High    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds   21.20%
Average Life (Years)   6 years 10 months 24 days
Discount Rate   14.10%
Recapture Rate   30.00%
Predecessor | Excess spread financing | Weighted-average    
Assumption for Fair Value of Mortgage Servicing Rights    
Prepayment Speeds   13.70%
Average Life (Years)   5 years 10 months 24 days
Discount Rate   10.80%
Recapture Rate   18.70%
Predecessor | MSR Financing Liability | Financing rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Advance financing rates   3.50%
Predecessor | MSR Financing Liability | Recovery rates    
Assumption for Fair Value of Mortgage Servicing Rights    
Annual advance recovery rates   23.20%