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Principles of Consolidation - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Variable Interest Entity [Line Items]
Principal balance of loans transferred	$ 1,573,703	$ 348,257
Trading securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	43,362	1,716
AFS securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 3,198	$ 885

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- Definition

Principal Amount Of Loans Securitized During Period

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- Definition

Securities Retained At Fair Value During Period

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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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