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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 129,924	$ 53,238
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(73,178)	(16,072)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(958,966)	(230,539)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(958,966)	(230,539)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		950,542	228,467
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		8,424	1,061
Net Amount		0	(1,011)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		87,960	19,951
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		87,960	19,951
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		0	0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(74,052)	(7,769)
Net Amount		13,908	12,182
TBAs
Assets
Gross Amounts of Recognized Assets (Liabilities)		40,800	18,260
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		40,800	18,260
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(29,648)	(13,423)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(8,696)	(4,658)
Net Amount		2,456	179
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(35,621)	(15,495)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(35,621)	(15,495)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		29,648	13,423
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		5,973	1,061
Net Amount		0	(1,011)
Futures
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(2,451)
Gross Amounts Offset in Consolidated Balance Sheet		0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(2,451)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		2,451
Net Amount		0
Interest Rate Agreement, TBAs, and Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		128,760	38,211
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		128,760	38,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(29,648)	(13,423)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		(82,748)	(12,427)
Net Amount		16,364	12,361
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(839,224)	(137,269)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(839,224)	(137,269)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		839,224	137,269
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	0
Net Amount		0	0
Security repurchase agreements
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(81,670)	(77,775)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(81,670)	(77,775)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		81,670	77,775
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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $7,724,203 and $8,141,069, respectively. At March 31, 2021 and December 31, 2020, liabilities of consolidated VIEs totaled $6,704,943 and $7,148,414, respectively. See Note 4 for further discussion.

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