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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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Principal balance of loans transferred	$ 1,231,803	$ 2,223,462
Trading securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	7,774	49,089
AFS Securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 1,600	$ 4,187

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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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