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, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Principal balance of loans transferred	$ 0	$ 1,231,803
Trading securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	0	7,774
AFS Securities
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 0	$ 1,600