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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term | 5 years 10 months 24 days | 6 years 4 months 24 days
Mortgage Servicing Rights - Amortized Costs [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Advance financing cost |  | 5 years
Interest rate for computing float earnings |  | 5 years
Weighted average cost to service (in dollars) |  | 108
Fair Value Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Advance financing cost | 5 years | 5 years
Interest rate for computing float earnings | 5 years | 5 years
Weighted average cost to service (in dollars) | 90 | 64
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate for computing float earnings | 5 years | 5 years
Fair value inputs financing costs float earnings, basis spread | 0.50% | 0.50%
Fair value input, interest rate | 2.75% | 2.75%
Weighted average cost to service (in dollars) | 297 | 305
Automotive Dealer Financing Notes [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term |  | 2 months 19 days
Fair value inputs average note rate |  | 8.50%
Fair value inputs loan loss rate |  | 21.50%
HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term | 5 years 10 months 24 days | 6 years 4 months 24 days
Mortgage Servicing Rights Pledged [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate for computing float earnings | 5 years |
Fair value inputs financing costs float earnings, basis spread | 0.50% | 0.50%
Fair value input, interest rate | 2.75% | 2.75%
Weighted average cost to service (in dollars) | 234 | 311
Measurement Input, Prepayment Rate [Member] | Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 14.70% | 13.10%
Measurement Input, Prepayment Rate [Member] | Mortgage Servicing Rights - Amortized Costs [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions |  | 8.80%
Measurement Input, Prepayment Rate [Member] | Fair Value Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 8.50% | 8.10%
Measurement Input, Prepayment Rate [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 15.40% | 16.60%
Measurement Input, Prepayment Rate [Member] | HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 14.70% | 13.10%
Measurement Input, Prepayment Rate [Member] | Mortgage Servicing Rights Pledged [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 13.90% | 17.00%
Measurement Input, Default Rate [Member] | Mortgage Servicing Rights - Amortized Costs [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions |  | 10.90%
Measurement Input, Default Rate [Member] | Fair Value Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 6.60% | 1.00%
Measurement Input, Default Rate [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 27.10% | 28.50%
Measurement Input, Default Rate [Member] | Mortgage Servicing Rights Pledged [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 20.30% | 28.90%
Measurement Input, Discount Rate [Member] | Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 3.40% | 3.20%
Measurement Input, Discount Rate [Member] | Mortgage Servicing Rights - Amortized Costs [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions |  | 9.20%
Measurement Input, Discount Rate [Member] | Fair Value Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 9.10% | 9.00%
Measurement Input, Discount Rate [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 12.80% | 13.00%
Measurement Input, Discount Rate [Member] | Automotive Dealer Financing Notes [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions |  | 10.00%
Measurement Input, Discount Rate [Member] | HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 3.30% | 3.11%
Measurement Input, Discount Rate [Member] | Mortgage Servicing Rights Pledged [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 12.00% | 13.70%
LIBOR [Member] | Mortgage Servicing Rights Pledged [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate for computing float earnings |  | 1 month
Minimum [Member] | Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term | 3 years | 4 years 4 months 24 days
Minimum [Member] | HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term | 3 years | 4 years 4 months 24 days
Minimum [Member] | Measurement Input, Prepayment Rate [Member] | Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 6.80% | 5.40%
Minimum [Member] | Measurement Input, Prepayment Rate [Member] | HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 6.80% | 5.40%
Maximum [Member] | Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term | 7 years 7 months 6 days | 8 years 1 month 6 days
Maximum [Member] | HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value valuation assumptions, term | 7 years 7 months 6 days | 8 years 1 month 6 days
Maximum [Member] | Measurement Input, Prepayment Rate [Member] | Loans Held for Investment [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 38.40% | 51.90%
Maximum [Member] | Measurement Input, Prepayment Rate [Member] | HMBS - Related Borrowings [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Measurement Valuation Assumptions | 38.40% | 51.90%

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