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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 35,701	$ 35,789
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(163,424)	(84,855)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(1,690,828)	(1,933,663)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(1,690,828)	(1,933,663)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,548,637	1,881,142
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		141,260	48,317
Net Amount		(931)	(4,204)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		19,020	28,211
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		19,020	28,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(14,178)	(28,211)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(915)	0
Net Amount		3,927	0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(148,765)	(70,908)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(148,765)	(70,908)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		14,178	28,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		134,587	42,697
Net Amount		0	0
TBAs
Assets
Gross Amounts of Recognized Assets (Liabilities)		5,755	4,665
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		5,755	4,665
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(5,755)	(3,391)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		0	(835)
Net Amount		0	439
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(13,359)	(13,215)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(13,359)	(13,215)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		5,755	3,391
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		6,673	5,620
Net Amount		(931)	(4,204)
Interest rate futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		137
Gross Amounts Offset in Consolidated Balance Sheet		0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		137
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		0
Net Amount		137
Interest Rate Agreement, TBAs, And Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		24,912	32,876
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		24,912	32,876
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(19,933)	(31,602)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received		(915)	(835)
Net Amount		4,064	439
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(432,126)	(860,650)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(432,126)	(860,650)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		432,126	860,650
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged		0	0
Net Amount		0	0
Security repurchase agreements
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(1,096,578)	(988,890)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(1,096,578)	(988,890)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,096,578	988,890
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, 2019 and December 31, 2018, assets of consolidated VIEs totaled $11,931,869 and $6,331,191, respectively. At December 31, 2019 and December 31, 2018, liabilities of consolidated VIEs totaled $10,717,072 and $5,709,807, respectively. See Note 4 for further discussion.

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