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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Loans Held for Investment [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life | 6 years 1 month 6 days |  |  | 6 years 4 months 24 days |
Weighted average prepayment speed | 14.00% |  |  | 13.10% |
Weighted average discount rate | 2.80% |  |  | 3.20% |
Loans Held for Investment [Member] | Minimum [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life | 3 years 8 months 12 days |  |  | 4 years 4 months 24 days |
Weighted average prepayment speed | 6.00% |  |  | 5.40% |
Loans Held for Investment [Member] | Maximum [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life | 8 years 3 months 18 days |  |  | 8 years 1 month 6 days |
Weighted average prepayment speed | 51.20% |  |  | 51.90% |
Mortgage Servicing Rights - Amortized Costs [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Weighted average prepayment speed |  |  |  | 8.80% |
Weighted average delinquency rate |  |  |  | 10.90% |
Advance financing cost | 5 years |  |  | 5 years |
Interest rate for computing float earnings | 5 years |  |  | 5 years |
Weighted average discount rate |  |  |  | 9.20% |
Weighted average cost to service (in dollars) |  |  |  | 108 |
Fair Value Agency Mortgage Servicing Rights [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Weighted average prepayment speed | 7.60% | [1] |  | 8.10% |
Weighted average delinquency rate | 11.10% | [1] |  | 1.00% |
Advance financing cost | 5 years |  |  | 5 years |
Interest rate for computing float earnings | 5 years |  |  | 5 years |
Weighted average discount rate | 9.20% | [1] |  | 9.00% |
Weighted average cost to service (in dollars) | 108 | [1] |  | 64 |
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Weighted average prepayment speed | 16.10% |  |  | 16.60% |
Weighted average delinquency rate | 28.50% |  |  | 28.50% |
Fair value inputs financing costs float earnings, basis spread | 0.50% |  |  | 0.50% |
Fair value input, interest rate | 2.75% |  |  | 2.75% |
Weighted average discount rate | 12.90% |  |  | 13.00% |
Weighted average cost to service (in dollars) | 305 |  |  | 305 |
HMBS - Related Borrowings [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life | 6 years 1 month 6 days |  |  | 6 years 4 months 24 days |
Weighted average prepayment speed | 14.00% |  |  | 13.10% |
Weighted average discount rate | 2.70% |  |  | 3.10% |
HMBS - Related Borrowings [Member] | Minimum [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life | 3 years 8 months 12 days |  |  | 4 years 4 months 24 days |
Weighted average prepayment speed | 6.00% |  |  | 5.40% |
HMBS - Related Borrowings [Member] | Maximum [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life | 8 years 3 months 18 days |  |  | 8 years 1 month 6 days |
Weighted average prepayment speed | 51.20% |  |  | 51.90% |
Mortgage Servicing Rights Pledged [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Weighted average prepayment speed | 16.50% |  |  | 17.00% |
Weighted average delinquency rate | 28.90% |  |  | 28.90% |
Fair value inputs financing costs float earnings, basis spread | 0.50% |  |  | 0.50% |
Fair value input, interest rate | 2.75% |  |  | 2.75% |
Weighted average discount rate | 13.70% |  |  | 13.70% |
Weighted average cost to service (in dollars) | 311 |  |  | 311 |
Automotive Dealer Financing Notes [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Life |  |  |  | 2 months 21 days |
Weighted average discount rate |  |  |  | 10.00% |
Fair value inputs average note rate |  |  |  | 8.50% |
Fair value inputs loan loss rate |  |  |  | 21.50% |
London Interbank Offered Rate (LIBOR) [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Interest rate for computing float earnings |  |  | 5 years | 5 years |
London Interbank Offered Rate (LIBOR) [Member] | Mortgage Servicing Rights Pledged [Member] |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |
Interest rate for computing float earnings |  |  | 5 years |  | 5 years
[1] | The change in valuation assumptions for Agency MSRs at March 31, 2018, as compared to December 31, 2017, reflects the effects of our fair value election on January 1, 2018 for our remaining MSRs carried at amortized cost.

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