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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Assets
Trading securities		$ 221,571	$ 404,011
Available-for-sale securities		698,356	829,245
Derivative assets	[1]	31,975	16,393
MSRs		126,620	191,976	[1]
Pledged collateral		59,664	53,600
Liabilities
Derivative liabilities	[1]	97,468	62,794
Commercial secured borrowings		65,181	63,152
Fair Value, Measurements, Recurring
Assets
Trading securities		221,571	404,011
Available-for-sale securities		698,356	829,245
Derivative assets		31,975	16,393
MSRs		126,620	191,976
Pledged collateral		59,664	53,600
FHLBC stock		44,071	34,437
Guarantees asset		4,272	5,697
Liabilities
Derivative liabilities		97,468	62,794
Commercial secured borrowings		65,181	63,152
ABS issued		907,023	996,820
Fair Value, Measurements, Recurring | Residential Loans at Fair Value
Assets
Loans at fair value		3,713,654	3,927,370
Fair Value, Measurements, Recurring | Commercial Loans at Fair Value
Assets
Loans at fair value		69,674	106,798
Fair Value, Measurements, Recurring | Level 1
Assets
Trading securities			0
Available-for-sale securities			0
Derivative assets		2,843	2,734
MSRs			0
Pledged collateral		59,664	53,600
FHLBC stock		0	0
Liabilities
Derivative liabilities		5,063	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		24,188	8,988
MSRs			0
Pledged collateral			0
FHLBC stock		44,071	34,437
Liabilities
Derivative liabilities		92,100	58,368
Commercial secured borrowings			0
Fair Value, Measurements, Recurring | Level 2 | Residential Loans at Fair Value
Assets
Loans at fair value		1,387	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		221,571	404,011
Available-for-sale securities		698,356	829,245
Derivative assets		4,944	4,671
MSRs		126,620	191,976
Pledged collateral			0
FHLBC stock			0
Guarantees asset		4,272	5,697
Liabilities
Derivative liabilities		305	1,463
Commercial secured borrowings		65,181	63,152
ABS issued		907,023	996,820
Fair Value, Measurements, Recurring | Level 3 | Residential Loans at Fair Value
Assets
Loans at fair value		3,712,267	3,797,551
Fair Value, Measurements, Recurring | Level 3 | Commercial Loans at Fair Value
Assets
Loans at fair value		$ 69,674	$ 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 March 31, 2016 and December 31, 2015, assets of consolidated VIEs totaled $1,102,195 and $1,195,574, respectively. At March 31, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $959,464 and $1,050,861, respectively. See Note 4 for further discussion.

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