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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Assets
Trading securities		$ 404,011	$ 111,606
Available-for-sale securities		829,245	1,267,624
Derivative assets	[1]	16,393	16,417
MSRs	[1]	191,976	139,293
Pledged collateral		53,600	9,927
Liabilities
Derivative liabilities	[1]	62,794	58,331
Commercial secured borrowings		63,152	66,707
Fair Value, Measurements, Recurring
Assets
Trading securities		404,011	111,606
Available-for-sale securities		829,245	1,267,624
Derivative assets		16,393	16,417
MSRs		191,976	139,293
Pledged collateral		53,600	9,927
FHLBC stock		34,437	10,688
Guarantees asset		5,697	7,201
Liabilities
Derivative liabilities		62,794	58,331
Commercial secured borrowings		63,152	66,707
ABS issued		996,820
Fair Value, Measurements, Recurring | Residential Loans at Fair Value
Assets
Loans at fair value		3,927,370	1,922,700
Fair Value, Measurements, Recurring | Commercial Loans at Fair Value
Assets
Loans at fair value		106,798	237,496
Fair Value, Measurements, Recurring | Level 1
Assets
Trading securities			0
Available-for-sale securities			0
Derivative assets		2,734	6,654
MSRs			0
Pledged collateral		53,600	9,927
FHLBC stock		0	0
Liabilities
Derivative liabilities		2,963	9,878
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		8,988	8,603
MSRs			0
Pledged collateral			0
FHLBC stock		34,437	10,688
Liabilities
Derivative liabilities		58,368	48,412
Commercial secured borrowings			0
Fair Value, Measurements, Recurring | Level 2 | Residential Loans at Fair Value
Assets
Loans at fair value		129,819	244,716
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		404,011	111,606
Available-for-sale securities		829,245	1,267,624
Derivative assets		4,671	1,160
MSRs		191,976	139,293
Pledged collateral			0
FHLBC stock			0
Guarantees asset		5,697	7,201
Liabilities
Derivative liabilities		1,463	41
Commercial secured borrowings		63,152	66,707
ABS issued		996,820
Fair Value, Measurements, Recurring | Level 3 | Residential Loans at Fair Value
Assets
Loans at fair value		3,797,551	1,677,984
Fair Value, Measurements, Recurring | Level 3 | Commercial Loans at Fair Value
Assets
Loans at fair value		$ 106,798	$ 237,496
Range 1 | Fixed Loans | Commercial Loans Held-for-Investment, at Fair Value
Assets
Interest Rate		10.00%	10.00%
[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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