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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Sep. 30, 2022	Dec. 31, 2021
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 65,213	$ 26,467
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(6,782)	(3,317)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(230,940)	(575,534)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(230,940)	(575,534)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		224,924	574,629
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		1,280	895
Net Amount		(4,736)	(10)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		24,626	18,929
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		24,626	18,929
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(23)	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(7,638)	(16,046)
Net Amount		16,965	1,632
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(23)	(1,251)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(23)	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		23	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)		13,568	2,880
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		13,568	2,880
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(529)	(633)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(12,077)	(704)
Net Amount		962	1,543
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(6,545)	(658)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(6,545)	(658)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		529	633
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		1,280	15
Net Amount		(4,736)	(10)
Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		26,275	25
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		26,275	25
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(2)	(25)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(10,675)	0
Net Amount		15,598	0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(2)	(905)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(2)	(905)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		2	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)		64,469	21,834
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		64,469	21,834
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(554)	(1,909)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(30,390)	(16,750)
Net Amount		33,525	3,175
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(224,370)	(572,720)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(224,370)	(572,720)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		224,370	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 September 30, 2022 and December 31, 2021, assets of consolidated VIEs totaled $9,449,163 and $10,661,081, respectively. At September 30, 2022 and December 31, 2021, liabilities of consolidated VIEs totaled $8,448,479 and $9,619,347, respectively. See Note 4 for further discussion.

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