Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 4 months 24 days	6 years 1 month 6 days
Repayment rate	13.10%	20.90%
Weighted average discount rate	3.20%	3.30%
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	9.20%	8.90%
Weighted average cost to service (in dollars)	108	108
Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	8.10%	8.40%
Weighted average delinquency rate	1.00%	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)	64	64
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	16.60%	16.50%
Weighted average delinquency rate	28.50%	29.30%
Interest rate for computing float earnings	5 years
Fair value inputs financing costs float earnings, basis spread	0.50%
Fair value input, interest rate	2.75%
Weighted average discount rate	13.00%	14.90%
Weighted average cost to service (in dollars)	305	307
Automotive Dealer Financing Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	2 months 19 days	3 months 7 days
Weighted average discount rate	10.00%	10.00%
Fair value inputs average note rate	8.50%	8.30%
Fair value inputs loan loss rate	21.50%	11.30%
HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 4 months 24 days	5 years 1 month 6 days
Repayment rate	13.10%	20.90%
Weighted average discount rate	3.10%	2.70%
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	28.90%	29.80%
Interest rate for computing float earnings	5 years
Fair value inputs financing costs float earnings, basis spread	0.50%
Fair value input, interest rate	2.75%
Weighted average discount rate	13.70%	14.90%
Weighted average cost to service (in dollars)	311	313
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
Fair value input, interest rate		3.50%
LIBOR [Member] \| Mortgage Servicing Rights Pledged [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Interest rate for computing float earnings		1 month
Fair value input, interest rate		3.50%
Minimum [Member] \| Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	4 years 4 months 24 days	5 years 6 months
Repayment rate	5.40%	5.20%
Minimum [Member] \| HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	4 years 4 months 24 days	4 years 6 months
Repayment rate	5.40%	5.20%
Maximum [Member] \| Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	8 years 1 month 6 days	8 years 8 months 12 days
Repayment rate	51.90%	53.80%
Maximum [Member] \| HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	8 years 1 month 6 days	8 years 8 months 12 days
Repayment rate	51.90%	53.80%

Fair value inputs average note rate.

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- Definition

Represents the fair value inputs basis spread on advance borrowings.

+ References

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- Definition

Fair Value Inputs, Financing Costs, Comparative Derivative Term

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- Definition

Fair Value Inputs, Financing Costs, Float Earnings

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Fair value inputs financing costs float earnings basis spread.

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Fair value inputs loan loss rate.

+ References

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- Definition

Fair Value Inputs, Repayment Rate

+ References

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- Definition

Fair value inputs, weighted average cost to service (in dollars).

+ References

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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.

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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.

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