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Mortgage Servicing Rights ("MSRs") and Related Liabilities - Fair Value Assumptions (Details) | 9 Months Ended
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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%

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- Definition Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected weighted-average life + References No definition available. + Details
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- Definition Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + Details
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- Definition Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + Details
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- Definition Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107314-111719 + Details
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