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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Loans Held for Investment [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 5 years 10 months 24 days | 6 years 1 month 6 days
Weighted average prepayment speed | 21.20% | 20.90%
Weighted average discount rate | 3.30% | 3.30%
Loans Held for Investment [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 5 years 6 months | 5 years 6 months
Weighted average prepayment speed | 5.30% | 5.20%
Loans Held for Investment [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 8 years 6 months | 8 years 8 months 12 days
Weighted average prepayment speed | 53.80% | 53.80%
Mortgage Servicing Rights - Amortized Costs [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted average prepayment speed | 8.80% | 8.90%
Weighted average delinquency rate | 10.90% | 11.10%
Advance financing cost | 5 years | 5 years
Interest rate for computing float earnings | 5 years | 5 years
Weighted average discount rate | 8.90% | 8.90%
Weighted average cost to service (in dollars) | 107 | 108
Fair Value Agency Mortgage Servicing Rights [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted average prepayment speed | 7.90% | 8.40%
Weighted average delinquency rate | 1.50% | 1.00%
Advance financing cost | 5 years | 5 years
Interest rate for computing float earnings | 5 years | 5 years
Weighted average discount rate | 9.00% | 9.00%
Weighted average cost to service (in dollars) | 65 | 64
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted average prepayment speed | 16.50% | 16.50%
Weighted average delinquency rate | 29.30% | 29.30%
Fair value input, interest rate | 3.50% | 3.50%
Weighted average discount rate | 12.80% | 14.90%
Weighted average cost to service (in dollars) | 308 | 307
HMBS - Related Borrowings [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 5 years | 5 years 1 month 6 days
Weighted average prepayment speed | 21.20% | 20.90%
Weighted average discount rate | 2.70% | 2.70%
HMBS - Related Borrowings [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 4 years 6 months | 4 years 6 months
Weighted average prepayment speed | 5.30% | 5.20%
HMBS - Related Borrowings [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 8 years 6 months | 8 years 8 months 12 days
Weighted average prepayment speed | 53.80% | 53.80%
Mortgage Servicing Rights Pledged [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Weighted average prepayment speed | 17.00% | 17.00%
Weighted average delinquency rate | 29.80% | 29.80%
Fair value input, interest rate | 3.50% | 3.50%
Weighted average discount rate | 13.70% | 14.90%
Weighted average cost to service (in dollars) | 315 | 313
Automotive Dealer Financing Notes [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Life | 2 months 21 days | 2 months 21 days
Weighted average discount rate | 10.00% | 10.00%
Fair value inputs average note rate | 8.30% | 8.30%
Fair value inputs loan loss rate | 26.70% | 11.30%
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 | 1 month | 1 month
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 | 1 month | 1 month

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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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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + 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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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + 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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