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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 36,587	$ 26,467
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(6,591)	(3,317)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(429,683)	(575,534)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(429,683)	(575,534)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		428,209	574,629
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		1,474	895
Net Amount		0	(10)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		29,601	18,929
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		29,601	18,929
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(2,445)	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(6,451)	(16,046)
Net Amount		20,705	1,632
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(2,445)	(1,251)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(2,445)	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		2,445	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)		3,104	2,880
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		3,104	2,880
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(530)	(633)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(2,574)	(704)
Net Amount		0	1,543
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(2,004)	(658)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(2,004)	(658)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		530	633
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		1,474	15
Net Amount		0	(10)
Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		1,875	25
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		1,875	25
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(1,615)	(25)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(2)	0
Net Amount		258	0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(1,615)	(905)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(1,615)	(905)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,615	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)		34,580	21,834
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		34,580	21,834
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(4,590)	(1,909)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(9,027)	(16,750)
Net Amount		20,963	3,175
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(423,619)	(572,720)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(423,619)	(572,720)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		423,619	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 June 30, 2022 and December 31, 2021, assets of consolidated VIEs totaled $9,951,520 and $10,661,081, respectively. At June 30, 2022 and December 31, 2021, liabilities of consolidated VIEs totaled $8,899,020 and $9,619,347, respectively. See Note 4 for further discussion.

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