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Principles of Consolidation - Assumptions Related to Assets Retained from Unconsolidated VIEs Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
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	25.00%	9.00%
Discount rates	14.00%	14.00%
Credit loss assumptions	0.20%	0.20%
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	15.00%	10.00%
Discount rates	7.00%	5.00%
Credit loss assumptions	0.20%	0.20%

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
-Paragraph 3
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- Definition

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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