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Principles of Consolidation - Assumptions Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
MSRs
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Prepayment rates				9.00%
Discount rates				11.00%
Senior IO Securities
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Prepayment rates	9.00%	11.00%	9.00%	10.00%
Discount rates	14.00%	14.00%	14.00%	13.00%
Credit loss assumptions	0.20%	0.25%	0.20%	0.25%
Subordinate Securities
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Prepayment rates	9.00%	10.00%	10.00%	10.00%
Discount rates	7.00%	5.00%	5.00%	5.00%
Credit loss assumptions	0.20%	0.25%	0.20%	0.25%

X

- Definition

Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
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Rate at which principal will not be repaid on securitized financial assets, including for example, but not limited to, expected static pool losses for initial fair value measurement.

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Estimated rate of prepayment of principal on financial assets for initial fair value measurement.

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