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Commercial Loans - Additional Information (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) loan	Jun. 30, 2015 USD ($) loan	Dec. 31, 2015 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers from loans held-for-investment to loans held-for-sale					$ 359,005	$ 0
Aggregate fair value		$ 325,063	$ 325,063		325,063		$ 402,647
Loans receivable, fair value		325,063	325,063		325,063		402,647
Senior commercial loans, held for sale					2,578,592	5,656,836
Sale of loan for third party, held for sale					$ 2,158,601	$ 5,366,705
Average recorded investment of impaired loan			18,000
Commercial Loans Held-for-Investment, at Amortized Cost
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans financed through securitization							166,000
Loan pledged as collateral							135,000
Number of loans | loan					2	59
Aggregate fair value		22,285	22,285		$ 22,285		295,849
Loans receivable, fair value		22,285	22,285		22,285		295,849
Recorded investment in loans		23,144	23,144		23,144		302,951
Commercial Loans Held-for-Investment, at Amortized Cost | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, fair value		$ 22,421	$ 22,421		$ 22,421		300,824
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		24.00%	24.00%		24.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		76.00%	76.00%		76.00%
Commercial Loans, A and B-Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan					3
Principal balance		$ 67,000	$ 67,000		$ 67,000		67,000
Loans receivable, fair value		70,000	70,000		70,000		68,000
Commercial Loans, Held-for-Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan						4
Principal balance							39,000
Aggregate fair value	[1]	302,778	302,778		302,778		39,141
Loans receivable, fair value		69,720	69,720		69,720		39,141
Senior commercial loans, held for sale				$ 258,000	38,000	$ 350,000
Sale of loan for third party, held for sale				146,000	76,000	348,000
Valuation adjustments				$ 1,000	400	$ 7,000
Loans, held-for-sale		69,720	69,720		69,720		39,141
Commercial Loans, Held-for-Sale | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, held-for-sale		69,720	69,720		69,720		$ 39,141
Commercial Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held-for-sale to held-for-sale, principal balance		67,000
Transfers from loans held-for-investment to loans held-for-sale		70,000
Number of loans | loan							3
Aggregate fair value	[1]	22,285	22,285		22,285		$ 363,506
Loans receivable, fair value		0	0		0		67,657
Commercial Loans Held-for-Investment, at Fair Value, B-Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate fair value		4,000	4,000		4,000		5,000
Commercial Loans at Lower of Cost or Market
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held-for-sale to held-for-sale, principal balance		237,000
Transfers from loans held-for-investment to loans held-for-sale		233,000
Net purchase discount on loans transferred to held-for-sale		4,000	4,000		$ 4,000
Number of loans | loan					51
Principal balance		237,000	237,000		$ 237,000
Valuation adjustments		4,000
Loans, held-for-sale		233,058	233,058		233,058		0
Commercial Loans at Lower of Cost or Market | Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, held-for-sale		$ 236,824	$ 236,824		$ 236,824		$ 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, 2016 and December 31, 2015, assets of consolidated VIEs totaled $888,026 and $1,195,574, respectively. At June 30, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $860,256 and $1,050,861, respectively. See Note 4 for further discussion.

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