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

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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
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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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
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-Section 50
-Paragraph 2
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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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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)
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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

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-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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