Fair Value Schedule of Significant Assumptions used in Valuation (Details) - $ / loan	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	6 years 18 days	6 years 5 months 26 days
Repayment rate	20.91%	19.85%
Weighted average discount rate	3.32%	3.36%
Mortgage Servicing Rights - Amortized Costs [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	8.90%	11.34%
Weighted average delinquency rate	11.08%	13.27%
Advance financing cost	5 years	5 years
Interest rate for computing float earnings	5 years	5 years
Weighted average discount rate	8.90%	9.41%
Weighted average cost to service (in dollars)	108	92
Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	8.36%	9.91%
Weighted average delinquency rate	0.99%	0.82%
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	71
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	16.47%	16.83%
Weighted average delinquency rate	29.32%	27.99%
Weighted average discount rate	14.93%	15.03%
Weighted average cost to service (in dollars)	307	321
Mortgage Servicing Rights Pledged [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average prepayment speed	16.96%	17.43%
Weighted average delinquency rate	29.80%	29.83%
Weighted average discount rate	14.85%	14.92%
Weighted average cost to service (in dollars)	313	326
HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	5 years 1 month 2 days	5 years 4 months 20 days
Repayment rate	20.91%	19.85%
Weighted average discount rate	2.70%	2.78%
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
Fair value input, interest rate	3.50%	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	1 month
Fair value input, interest rate	3.50%	3.50%
Minimum [Member] \| Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	5 years 6 months 11 days	6 years 1 month 10 days
Repayment rate	5.23%	4.96%
Minimum [Member] \| HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	4 years 6 months	4 years 8 months 23 days
Repayment rate	5.23%	4.96%
Maximum [Member] \| Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	8 years 8 months 1 day	9 years 8 months 12 days
Repayment rate	53.75%	53.75%
Maximum [Member] \| HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Life	8 years 8 months 1 day	9 years 8 months 12 days
Repayment rate	53.75%	53.75%

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Fair Value Inputs, Financing Costs, Comparative Derivative Term

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Fair Value Inputs, Financing Costs, Float Earnings

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Fair Value Inputs, Repayment Rate

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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
-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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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.

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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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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

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