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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 26,467	$ 53,238
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(3,317)	(16,072)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(575,534)	(230,539)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(575,534)	(230,539)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		574,629	228,467
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		895	1,061
Net Amount		(10)	(1,011)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		18,929	19,951
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		18,929	19,951
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(1,251)	0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(16,046)	(7,769)
Net Amount		1,632	12,182
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(1,251)
Gross Amounts Offset in Consolidated Balance Sheet		0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,251
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		0
Net Amount			0
TBAs
Assets
Gross Amounts of Recognized Assets (Liabilities)		2,880	18,260
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		2,880	18,260
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(633)	(13,423)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(704)	(4,658)
Net Amount		1,543	179
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(658)	(15,495)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(658)	(15,495)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		633	13,423
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		15	1,061
Net Amount		(10)	(1,011)
Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)			25
Gross Amounts Offset in Consolidated Balance Sheet			0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet			25
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments			(25)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received			0
Net Amount			0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(905)
Gross Amounts Offset in Consolidated Balance Sheet		0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(905)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		25
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		880
Net Amount		0
Interest Rate Agreement, TBAs, And Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		21,834	38,211
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		21,834	38,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(1,909)	(13,423)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(16,750)	(12,427)
Net Amount		3,175	12,361
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(572,720)	(137,269)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(572,720)	(137,269)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		572,720	137,269
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		0	0
Net Amount		$ 0	0
Security repurchase agreements
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)			(77,775)
Gross Amounts Offset in Consolidated Balance Sheet			0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet			(77,775)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments			77,775
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged			0
Net Amount			$ 0
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At December 31, 2021 and 2020, assets of consolidated VIEs totaled $10,661,081 and $8,141,069, respectively. At December 31, 2021 and 2020, liabilities of consolidated VIEs totaled $9,619,347 and $7,148,414, respectively. See Note 4 for further discussion.

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