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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Assets
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	$ 26,609	$ 35,789
Liabilities
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet	[1]	(173,847)	(84,855)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(2,025,050)	(1,933,663)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(2,025,050)	(1,933,663)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,871,628	1,881,142
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		152,167	48,317
Net Amount		(1,255)	(4,204)
Interest rate agreements
Assets
Gross Amounts of Recognized Assets (Liabilities)		19,258	28,211
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		19,258	28,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(17,869)	(28,211)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	0
Net Amount		1,389	0
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(168,436)	(70,908)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(168,436)	(70,908)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		17,869	28,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		150,567	42,697
Net Amount		0	0
TBAs
Assets
Gross Amounts of Recognized Assets (Liabilities)		1,784	4,665
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		1,784	4,665
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(1,784)	(3,391)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	(835)
Net Amount		0	439
Liabilities
Gross Amounts of Recognized Assets (Liabilities)		(4,639)	(13,215)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(4,639)	(13,215)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,784	3,391
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		1,600	5,620
Net Amount		(1,255)	(4,204)
Interest Rate Agreement, TBAs, And Futures
Assets
Gross Amounts of Recognized Assets (Liabilities)		21,042	32,876
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		21,042	32,876
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		(19,653)	(31,602)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	(835)
Net Amount		1,389	439
Loan warehouse debt
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(638,055)	(860,650)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(638,055)	(860,650)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		638,055	860,650
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received) Pledged		0	0
Security repurchase agreements
Loan warehouse debt and Security repurchase agreement
Gross Amounts of Recognized Assets (Liabilities)		(1,213,920)	(988,890)
Gross Amounts Offset in Consolidated Balance Sheet		0	0
Net Amounts of Assets (Liabilities) Presented in Consolidated Balance Sheet		(1,213,920)	(988,890)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments		1,213,920	988,890
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, 2019 and December 31, 2018, assets of consolidated VIEs totaled $7,937,685 and $6,331,191, respectively. At June 30, 2019 and December 31, 2018, liabilities of consolidated VIEs totaled $7,189,086 and $5,709,807, respectively. See Note 4 for further discussion.

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