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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Assets and Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Assets
Trading securities		$ 1,205,389	$ 1,118,612
Available-for-sale securities		272,097	333,882
MSRs		236,632	286,778
Derivative assets	[1]	26,609	35,789
Pledged collateral		42,913	42,433
Liabilities
Contingent consideration		24,932	0
Derivative liabilities	[1]	173,847	84,855
Residential Loans
Assets
MSRs		259,222	300,468
Carrying Value
Assets
Trading securities		1,205,389	1,118,612
Available-for-sale securities		272,097	333,882
Cash and cash equivalents		218,145	175,764
Restricted cash		33,953	29,313
Accrued interest receivable		54,265	47,105
Derivative assets		26,609	35,789
Margin receivable		211,199	100,773
FHLBC stock		43,393	43,393
Guarantee asset		1,999	2,618
Pledged collateral		42,913	42,433
Liabilities
Accrued interest payable		47,092	42,528
Margin payable		0	835
Guarantee obligation		15,744	16,711
Contingent consideration		24,932	0
Derivative liabilities		173,847	84,855
ABS issued at fair value		6,913,129	5,410,073
FHLBC long-term borrowings		1,999,999	1,999,999
Convertible notes, net		634,805	633,196
Trust preferred securities and subordinated notes, net		138,605	138,582
Carrying Value | Servicer advance investments
Assets
MSRs		259,222	300,468
Carrying Value | MSRs
Assets
MSRs		47,396	60,281
Carrying Value | Participation in loan warehouse facility
Assets
Loans receivable, fair value		0	39,703
Carrying Value | Excess MSRs
Assets
REO		33,620	27,312
Carrying Value | REO
Assets
REO		6,305	3,943
Carrying Value | Short-term debt facilities
Liabilities
Short-term debt facilities		2,026,418	1,937,920
Carrying Value | Short-term debt - servicer advance financing
Liabilities
Short-term debt facilities		236,231	262,740
Carrying Value | Residential Loans | Residential loans, at fair value
Assets
Loans, held-for-sale		1,056,178	1,048,690
Carrying Value | Residential Loans | Residential loans, held-for-sale, At lower of cost or fair value
Assets
Loans, held-for-sale		109	111
Carrying Value | Residential Loans | Residential loans, held-for-investment
Assets
Loans receivable, fair value		6,227,078	6,205,941
Carrying Value | Residential Loans | Business purpose residential loans
Assets
Loans receivable, fair value		250,854	141,258
Carrying Value | Residential Loans | Multifamily loans
Assets
Loans receivable, fair value		3,749,657	2,144,598
Fair Value
Assets
Trading securities		1,205,389	1,118,612
Available-for-sale securities		272,097	333,882
Cash and cash equivalents		218,145	175,764
Restricted cash		33,953	29,313
Accrued interest receivable		54,265	47,105
Derivative assets		26,609	35,789
Margin receivable		211,199	100,773
FHLBC stock		43,393	43,393
Guarantee asset		1,999	2,618
Pledged collateral		42,913	42,433
Liabilities
Accrued interest payable		47,092	42,528
Margin payable		0	835
Guarantee obligation		15,456	16,774
Contingent consideration		24,932	0
Derivative liabilities		173,847	84,855
ABS issued at fair value		6,913,129	5,410,073
FHLBC long-term borrowings		1,999,999	1,999,999
Convertible notes, net		639,849	618,271
Trust preferred securities and subordinated notes, net		97,650	102,533
Fair Value | Servicer advance investments
Assets
MSRs		259,222	300,468
Fair Value | MSRs
Assets
MSRs		47,396	60,281
Fair Value | Participation in loan warehouse facility
Assets
Loans receivable, fair value		0	39,703
Fair Value | Excess MSRs
Assets
REO		33,620	27,312
Fair Value | REO
Assets
REO		6,509	4,396
Fair Value | Short-term debt facilities
Liabilities
Short-term debt facilities		2,026,418	1,937,920
Fair Value | Short-term debt - servicer advance financing
Liabilities
Short-term debt facilities		236,231	262,740
Fair Value | Residential Loans | Residential loans, at fair value
Assets
Loans, held-for-sale		1,056,178	1,048,690
Fair Value | Residential Loans | Residential loans, held-for-sale, At lower of cost or fair value
Assets
Loans, held-for-sale		128	131
Fair Value | Residential Loans | Residential loans, held-for-investment
Assets
Loans receivable, fair value		6,227,078	6,205,941
Fair Value | Residential Loans | Business purpose residential loans
Assets
Loans receivable, fair value		250,854	141,258
Fair Value | Residential Loans | Multifamily loans
Assets
Loans receivable, fair value		$ 3,749,657	$ 2,144,598
[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, 2019 and December 31, 2018, assets of consolidated VIEs totaled $7,937,685 and $6,331,191, respectively. At June 30, 2019 and December 31, 2018, liabilities of consolidated VIEs totaled $7,189,086 and $5,709,807, respectively. See Note 4 for further discussion.

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