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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	6 years 2 months 12 days	5 years 10 months 24 days
Fair value measurement valuation assumptions	2.80%	3.40%
Loans Held for Investment [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	13.90%	14.70%
Loans Held for Investment [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	2 years 10 months 24 days	3 years
Loans Held for Investment [Member] | Minimum [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	6.90%	6.80%
Loans Held for Investment [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	7 years 9 months 18 days	7 years 7 months 6 days
Loans Held for Investment [Member] | Maximum [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	32.40%	38.40%
Fair Value Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Advance financing cost	5 years	5 years
Interest rate for computing float earnings	5 years	5 years
Weighted average cost to service (in dollars)	86	90
Fair Value Agency Mortgage Servicing Rights [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	11.70%	8.50%
Fair Value Agency Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	6.90%	6.60%
Fair Value Agency Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	9.30%	9.10%
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
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)	295	297
Fair Value Non-Agency Mortgage Servicing Rights [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	15.50%	15.40%
Fair Value Non-Agency Mortgage Servicing Rights [Member] | Measurement Input, Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	27.20%	27.10%
Fair Value Non-Agency Mortgage Servicing Rights [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	12.60%	12.80%
HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	6 years 2 months 12 days	5 years 10 months 24 days
HMBS - Related Borrowings [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	13.90%	14.70%
HMBS - Related Borrowings [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	2.80%	3.30%
HMBS - Related Borrowings [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	2 years 10 months 24 days	3 years
HMBS - Related Borrowings [Member] | Minimum [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	6.90%	6.80%
HMBS - Related Borrowings [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	7 years 9 months 18 days	7 years 7 months 6 days
HMBS - Related Borrowings [Member] | Maximum [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	32.40%	38.40%
Mortgage Servicing Rights Pledged [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
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)	226	234
Mortgage Servicing Rights Pledged [Member] | Measurement Input, Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	14.60%	13.90%
Mortgage Servicing Rights Pledged [Member] | Measurement Input, Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	19.70%	20.30%
Mortgage Servicing Rights Pledged [Member] | Measurement Input, Discount Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Fair value measurement valuation assumptions	11.90%	12.00%
London Interbank Offered Rate (LIBOR) [Member] | Fair Value Non-Agency Mortgage Servicing Rights [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
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] (Deprecated 2018-01-31)
Interest rate for computing float earnings	5 years	5 years

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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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