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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Assets
Trading securities		$ 273,531	$ 404,011
Available-for-sale securities		610,270	829,245
Derivative assets	[1]	57,610	16,393
MSRs	[1]	110,046	191,976
Pledged collateral		44,095	53,600
Liabilities
Derivative liabilities	[1]	119,161	62,794
Commercial secured borrowings		65,240	63,152
Fair Value, Measurements, Recurring
Assets
Trading securities		273,531	404,011
Available-for-sale securities		610,270	829,245
Derivative assets		57,610	16,393
MSRs		110,046	191,976
Pledged collateral		44,095	53,600
FHLBC stock		43,393	34,437
Guarantees asset		3,320	5,697
Liabilities
Derivative liabilities		119,161	62,794
Commercial secured borrowings		65,240	63,152
ABS issued		859,628	996,820
Fair Value, Measurements, Recurring | Residential Loans at Fair Value
Assets
Loans at fair value		4,038,858	3,927,370
Fair Value, Measurements, Recurring | Commercial Loans at Fair Value
Assets
Loans at fair value		69,720	106,798
Fair Value, Measurements, Recurring | Level 1
Assets
Trading securities			0
Available-for-sale securities			0
Derivative assets		9,662	2,734
MSRs			0
Pledged collateral		44,095	53,600
FHLBC stock		0	0
Liabilities
Derivative liabilities		10,151	2,963
Commercial secured borrowings			0
Fair Value, Measurements, Recurring | Level 1 | Residential Loans at Fair Value
Assets
Loans at fair value			0
Fair Value, Measurements, Recurring | Level 1 | Commercial Loans at Fair Value
Assets
Loans at fair value			0
Fair Value, Measurements, Recurring | Level 2
Assets
Trading securities			0
Available-for-sale securities			0
Derivative assets		40,500	8,988
MSRs			0
Pledged collateral			0
FHLBC stock		43,393	34,437
Liabilities
Derivative liabilities		108,497	58,368
Commercial secured borrowings			0
Fair Value, Measurements, Recurring | Level 2 | Residential Loans at Fair Value
Assets
Loans at fair value		0	129,819
Fair Value, Measurements, Recurring | Level 2 | Commercial Loans at Fair Value
Assets
Loans at fair value			0
Fair Value, Measurements, Recurring | Level 3
Assets
Trading securities		273,531	404,011
Available-for-sale securities		610,270	829,245
Derivative assets		7,448	4,671
MSRs		110,046	191,976
Pledged collateral			0
FHLBC stock			0
Guarantees asset		3,320	5,697
Liabilities
Derivative liabilities		513	1,463
Commercial secured borrowings		65,240	63,152
ABS issued		859,628	996,820
Fair Value, Measurements, Recurring | Level 3 | Residential Loans at Fair Value
Assets
Loans at fair value		4,038,858	3,797,551
Fair Value, Measurements, Recurring | Level 3 | Commercial Loans at Fair Value
Assets
Loans at fair value		$ 69,720	$ 106,798
[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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