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Fair Value - Schedule of Significant Assumptions used in Valuation (Details) - $ / loan	3 Months Ended		12 Months Ended
	Mar. 31, 2019		Dec. 31, 2018
Loans Held for Investment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	6 years		5 years 10 months 24 days
Fair value measurement valuation assumptions	3.10%		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	14.40%		14.70%
Loans Held for Investment [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	3 years 2 months 12 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	6.80%		6.80%
Loans Held for Investment [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	7 years 6 months		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	36.10%		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	[1]	5 years
Interest rate for computing float earnings	5 years	[1]	5 years
Weighted average cost to service (in dollars)	89		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	9.80%		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	6.50%		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	9.00%		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)	297		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	15.40%		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	12.70%		12.80%
HMBS - Related Borrowings [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	6 years		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	14.40%		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	3.10%		3.30%
HMBS - Related Borrowings [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	3 years 2 months 12 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	6.80%		6.80%
HMBS - Related Borrowings [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Life	7 years 6 months		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	36.10%		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)	233		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	14.30%		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	20.30%		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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Fair value inputs, weighted average cost to service (in dollars).

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Fair value measurement valuation assumptions.

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Fair value valuation assumptions expected term.

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- Definition

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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