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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, 2019	Mar. 31, 2018
Variable Interest Entity [Line Items]
Principal balance of loans transferred	$ 348,257	$ 1,280,468
Trading securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	1,716	12,491
AFS securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 885	$ 3,905

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- Definition

Principal Amount Of Loans Securitized During Period

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- Definition

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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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