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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Variable Interest Entity [Line Items]
Principal balance of loans transferred	$ 0	$ 355,924	$ 0	$ 1,231,803
Trading securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	0	1,225	0	7,774
AFS securities retained, at fair value
Variable Interest Entity [Line Items]
Securities retained, at fair value	$ 0	$ 522	$ 0	$ 1,600