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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Assets
Trading securities		$ 907,432	$ 968,844
Available-for-sale securities		450,288	507,666
Derivative assets	[1]	63,544	15,718
MSRs	[1]	66,496	63,598
Pledged collateral		42,290	42,615
Liabilities
Derivative liabilities	[1]	56,201	63,081
Fair Value, Measurements, Recurring
Assets
Trading securities		907,432	968,844
Available-for-sale securities		450,288	507,666
Derivative assets		63,544	15,718
MSRs		66,496	63,598
Pledged collateral		42,290	42,615
FHLBC stock		43,393	43,393
Guarantee asset		3,055	2,869
Liabilities
Derivative liabilities		56,201	63,081
ABS issued		1,542,087	1,164,585
Fair Value, Measurements, Recurring | Residential Loans
Assets
Residential loans		5,145,445	5,114,317
Fair Value, Measurements, Recurring | Level 1
Assets
Trading securities		0	0
Available-for-sale securities		0	0
Derivative assets		8,625	134
MSRs		0	0
Pledged collateral		42,290	42,615
FHLBC stock		0	0
Guarantee asset		0	0
Liabilities
Derivative liabilities		5,814	3,808
ABS issued		0	0
Fair Value, Measurements, Recurring | Level 1 | Residential Loans
Assets
Residential loans		0	0
Fair Value, Measurements, Recurring | Level 2
Assets
Trading securities		0	0
Available-for-sale securities		0	0
Derivative assets		50,919	10,164
MSRs		0	0
Pledged collateral		0	0
FHLBC stock		43,393	43,393
Guarantee asset		0	0
Liabilities
Derivative liabilities		46,513	55,567
ABS issued		0	0
Fair Value, Measurements, Recurring | Level 2 | Residential Loans
Assets
Residential loans		0	0
Fair Value, Measurements, Recurring | Level 3
Assets
Trading securities		907,432	968,844
Available-for-sale securities		450,288	507,666
Derivative assets		4,000	5,420
MSRs		66,496	63,598
Pledged collateral		0	0
FHLBC stock		0	0
Guarantee asset		3,055	2,869
Liabilities
Derivative liabilities		3,874	3,706
ABS issued		1,542,087	1,164,585
Fair Value, Measurements, Recurring | Level 3 | Residential Loans
Assets
Residential loans		$ 5,145,445	$ 5,114,317
[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, 2018 and December 31, 2017, assets of consolidated VIEs totaled $1,647,850 and $1,259,774, respectively. At March 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $1,546,066 and $1,167,157, respectively. See Note 4 for further discussion.

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