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Short-Term Debt - Additional Information (Details) - USD ($)		3 Months Ended	9 Months Ended	12 Months Ended
		Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017	Apr. 30, 2018	Mar. 31, 2013
Short-term Debt [Line Items]
Trading securities pledged as collateral		$ 668,000,000	$ 668,000,000
Average balance of short-term debt		1,560,000,000	1,470,000,000
Accrued interest payable on short-term debt		3,000,000	3,000,000	$ 2,000,000
Committed line of credit		10,000,000	10,000,000
Fair value of mortgage backed securities securing loan (in excess)		4,000,000	4,000,000
Committed line of credit with financial institutions, outstanding		0	0	0
Accrued interest payable	[1]	31,076,000	31,076,000	18,435,000
Convertible Debt | Convertible Senior Notes Due 2018
Short-term Debt [Line Items]
Convertible notes				288,000,000		$ 288,000,000
Debt Instrument interest rate						4.625%
Unamortized deferred issuance costs				2,000,000
Amount of debt repurchased				37,000,000	$ 250,000,000
Gain (loss) on extinguishment of debt				(1,000,000)
Sequoia securities | Sequoia Choice
Short-term Debt [Line Items]
Trading securities pledged as collateral		129,000,000	129,000,000
Sequoia securities | Freddie Mac K-Series
Short-term Debt [Line Items]
Trading securities pledged as collateral		11,000,000	11,000,000
Residential loans
Short-term Debt [Line Items]
Loan pledged as collateral				1,150,000,000
Residential
Short-term Debt [Line Items]
Securities pledged as collateral		918,000,000	918,000,000	$ 788,000,000
Single-family rental loans, held-for-sale at fair value
Short-term Debt [Line Items]
Collateral amounts		20,000,000	20,000,000
Fix and flip loan warehouse
Short-term Debt [Line Items]
Collateral amounts		92,000,000	92,000,000
Residential Loans
Short-term Debt [Line Items]
Loan pledged as collateral		$ 622,000,000	$ 622,000,000
[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, 2018 and December 31, 2017, assets of consolidated VIEs totaled $3,693,140 and $1,259,774, respectively. At September 30, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $3,417,835 and $1,167,157, respectively. See Note 4 for further discussion.

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