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Residential Loans - Additional Information (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan	Dec. 31, 2013 USD ($)
Mortgage Loans on Real Estate [Line Items]
Carrying value		$ 3,928,803	$ 3,398,573
Principal balance of loans sold during period		9,040,000	7,900,000
Transfers from loans held-for-sale to loans held-for-investment		1,555,814	633,707	$ 0
Transfers from loans held-for-investment to loans held-for-sale		154,012	0	$ 0
Sequoia
Mortgage Loans on Real Estate [Line Items]
Carrying value		$ 1,021,870	$ 1,474,386
Fixed Rate Residential Mortgage
Mortgage Loans on Real Estate [Line Items]
Weighted average rate on loans		4.07%
Residential Loans | FHLB Chicago
Mortgage Loans on Real Estate [Line Items]
Residential mortgage loans securing FHLB advances		$ 1,680,000
Residential Loans at Fair Value
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		1,763	2,273
Principal value		$ 1,090,000	$ 1,300,000
Carrying value		$ 1,110,000	$ 1,340,000
Number of loans in foreclosure | loan		1	1
Principal value		$ 10,210,000	$ 8,810,000
Valuation adjustments		(4,000)	$ (51,000)
Loan pledged as collateral		1,070,000
Loans held as assets amount in foreclosure		$ 1,000
Residential Loans at Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans past due | loan		2	0
Residential Loans Held for Investment
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		4,545	5,315
Principal value		$ 1,122,415	$ 1,483,213
Carrying value		1,021,870	1,474,386
Unamortized premium, net		0	12,511
Allowance for loan losses		$ 0	$ 21,338
Residential Loans at Lower of Cost or Fair Value
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		9	9
Principal value		$ 2,000	$ 2,000
Carrying value		$ 1,433	$ 1,488
Number of loans in foreclosure | loan		1	1
Residential Loans at Lower of Cost or Fair Value | Sequoia
Mortgage Loans on Real Estate [Line Items]
Carrying value		$ 0	$ 0
Residential Loans at Lower of Cost or Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans past due | loan		2	0
Residential Loans Held For Investment at Fair Value
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		2,398	804
Principal value		$ 1,758,990	$ 566,372
Carrying value		$ 1,790,000	$ 580,000
Number of loans in foreclosure | loan		0	1
Valuation adjustments		$ (6,000)	$ (1,000)
Transfers from loans held-for-sale to loans held-for-investment		1,500,000	583,000
Transfers from loans held-for-investment to loans held-for-sale		$ 143,000	0
FICO credit score		772
Loan to value ratio		65.00%
Percentage of loans with fixed interest rate		97.00%
Residential Loans Held For Investment at Fair Value | Sequoia
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		4,545
FICO credit score		729
Loan to value ratio		66.00%
Loans held as assets, 90 days or more past due		$ 59,000	70,000
Loans held as assets amount in foreclosure		32,000	39,000
Valuation adjustments		$ 7,000	$ 0
Residential Loans Held For Investment at Fair Value | Hybrid Residential Mortgages
Mortgage Loans on Real Estate [Line Items]
Weighted average rate on loans		3.55%
Residential Loans Held For Investment at Fair Value | Originated In 2014 and 2015
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio		88.00%
Residential Loans Held For Investment at Fair Value | Originated During 2013
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio		6.00%
Residential Loans Held For Investment at Fair Value | Originated In 2012 And Prior Years
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio		6.00%
Residential Loans Held For Investment at Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans past due | loan		0	0
Residential Loans Held For Sale
Mortgage Loans on Real Estate [Line Items]
Number of loans | loan		1,772	2,282
Principal value		$ 1,091,518	$ 1,305,493
Carrying value	[1]	1,115,738	$ 1,342,519
Mortgage Servicing Rights
Mortgage Loans on Real Estate [Line Items]
Mortgage servicing rights		$ 2,230,000
[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 December 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,195,574 and $1,900,208, respectively. At December 31, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,050,861 and $1,546,490, respectively. See Note 4 for further discussion.

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