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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
MSRs recognized			$ 0	$ 7,387
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Principal balance of loans transferred	$ 327,511	$ 839,264	2,735,644	2,223,387
MSRs recognized	0	0	0	7,123
Variable Interest Entity, Not Primary Beneficiary | Trading securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	2,583	24,617	48,831	55,607
Variable Interest Entity, Not Primary Beneficiary | AFS securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 776	$ 4,416	$ 6,728	$ 11,476

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- Definition

Principal Amount Of Loans Securitized During Period

+ References

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- Definition

Securities Retained At Fair Value During Period

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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.

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