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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 112,060	$ 26,467
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(80,260)	(3,317)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(491,824)	(575,534)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(491,824)	(575,534)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		479,934	574,629
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		9,628	895
Net Amount		(2,262)	(10)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		11,412	18,929
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		11,412	18,929
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(650)	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	(16,046)
Net Amount		10,762	1,632
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(650)	(1,251)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(650)	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		650	1,251
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	0
Net Amount		0	0
TBAs
Assets
Gross Amounts of Recognized Assets (Liabilities)		95,631	2,880
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		95,631	2,880
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(52,993)	(633)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(41,706)	(704)
Net Amount		932	1,543
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(64,883)	(658)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(64,883)	(658)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		52,993	633
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		9,628	15
Net Amount		(2,262)	(10)
Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		2,907	25
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		2,907	25
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(236)	(25)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(151)	0
Net Amount		2,520	0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(236)	(905)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(236)	(905)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		236	25
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	880
Net Amount		0	0
Interest Rate Agreement, TBAs, and Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		109,950	21,834
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		109,950	21,834
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(53,879)	(1,909)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(41,857)	(16,750)
Net Amount		14,214	3,175
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(426,055)	(572,720)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(426,055)	(572,720)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		426,055	572,720
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	0
Net Amount		$ 0	$ 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 March 31, 2022 and December 31, 2021, assets of consolidated VIEs totaled $10,250,802 and $10,661,081, respectively. At March 31, 2022 and December 31, 2021, liabilities of consolidated VIEs totaled $9,202,156 and $9,619,347, respectively. See Note 4 for further discussion.

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