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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 20,830	$ 26,467
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(16,855)	(3,317)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(241,536)	(575,534)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(241,536)	(575,534)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		226,625	574,629
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		4,518	895
Net Amount		(10,393)	(10)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		14,625	18,929
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		14,625	18,929
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		0	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(5,944)	(16,046)
Net Amount		8,681	1,632
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		0	(1,251)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		0	(1,251)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		0	1,251
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		0	0
Net Amount		0	0
TBAs
Assets
Gross Amounts of Recognized Assets (Liabilities)		1,893	2,880
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		1,893	2,880
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(1,873)	(633)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		0	(704)
Net Amount		20	1,543
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(16,784)	(658)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(16,784)	(658)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,873	633
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		4,518	15
Net Amount		(10,393)	(10)
Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		3,976	25
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		3,976	25
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(57)	(25)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		0	0
Net Amount		3,919	0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(57)	(905)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(57)	(905)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		57	25
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		0	880
Net Amount		0	0
Interest Rate Agreement, TBAs, And Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		20,494	21,834
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		20,494	21,834
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(1,930)	(1,909)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(5,944)	(16,750)
Net Amount		12,620	3,175
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(224,695)	(572,720)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(224,695)	(572,720)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		224,695	572,720
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral 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 December 31, 2022 and 2021, assets of consolidated VIEs totaled $9,257,291 and $10,661,081, respectively. At December 31, 2022 and 2021, liabilities of consolidated VIEs totaled $8,270,276 and $9,619,347, respectively. See Note 4 for further discussion.

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