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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
MSRs recognized	$ 328	$ 7,387	$ 10,060
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Principal balance of loans transferred	3,188,358	2,573,789
MSRs recognized	0	7,123
Variable Interest Entity, Not Primary Beneficiary | Trading securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	52,859	66,321
Variable Interest Entity, Not Primary Beneficiary | AFS Securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 7,739	$ 13,341

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- Definition

Principal Amount Of Loans Securitized During Period

+ References

No definition available.

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- Definition

Securities Retained At Fair Value During Period

+ References

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+ Details

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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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.

+ References

No definition available.

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