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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Loans Held for Investment [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Life | 5 years 9 months 18 days |  | 6 years 4 months 24 days
Weighted average prepayment speed | 14.70% |  | 13.10%
Weighted average discount rate | 3.70% |  | 3.20%
Loans Held for Investment [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Life | 2 years 9 months 18 days |  | 4 years 4 months 24 days
Weighted average prepayment speed | 6.30% |  | 5.40%
Loans Held for Investment [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Life | 7 years 7 months 6 days |  | 8 years 1 month 6 days
Weighted average prepayment speed | 41.30% |  | 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
Interest rate for computing float earnings |  |  | 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 | 8.10% | [1] | 8.10%
Weighted average delinquency rate | 9.90% | [1] | 1.00%
Advance financing cost | 5 years | [1] | 5 years
Interest rate for computing float earnings | 5 years | [1] | 5 years
Weighted average discount rate | 9.00% | [1] | 9.00%
Weighted average cost to service (in dollars) | 105 | [1] | 64
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Weighted average prepayment speed | 15.70% |  | 16.60%
Weighted average delinquency rate | 27.60% |  | 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 | 12.70% |  | 13.00%
Weighted average cost to service (in dollars) | 301 |  | 305
HMBS - Related Borrowings [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Life | 5 years 9 months 18 days |  | 6 years 4 months 24 days
Weighted average prepayment speed | 14.70% |  | 13.10%
Weighted average discount rate | 3.70% |  | 3.10%
HMBS - Related Borrowings [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Life | 2 years 9 months 18 days |  | 4 years 4 months 24 days
Weighted average prepayment speed | 6.30% |  | 5.40%
HMBS - Related Borrowings [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Life | 7 years 7 months 6 days |  | 8 years 1 month 6 days
Weighted average prepayment speed | 41.30% |  | 51.90%
Mortgage Servicing Rights Pledged [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Weighted average prepayment speed | 16.10% |  | 17.00%
Weighted average delinquency rate | 28.10% |  | 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) | 307 |  | 311
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] | Valuation assumptions for Agency MSRs at September 30, 2018 include assumptions for MSRs we carried at amortized cost at December 31, 2017. Effective January 1, 2018, we elected fair value accounting for our remaining MSRs that we had previously carried at amortized cost.

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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