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Commercial Loans - Additional Information (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan	Dec. 31, 2013 USD ($)
Commercial Loans [Line Items]
Carrying value		$ 402,647	$ 566,927
Senior commercial loans, held for sale		11,045,813	9,917,943	$ 7,766,203
Sale of loan for third party, held for sale		9,761,010	8,126,249	$ 7,405,088
Commercial Loans Held-for-Investment, at Amortized Cost
Commercial Loans [Line Items]
Commercial loans financed through Commercial Securitization entity		$ 166,000	$ 195,000
Number of loans | loan		59	60
Carrying value		$ 295,849	$ 329,431
Loan pledged as collateral		135,000	80,000
Senior commercial loans, held for Investment		22,000	59,000
Repayments received		57,000	71,000
Yield maintenance fees received		4,000	2,000
Recorded investment		$ 302,951	$ 336,888
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2015
Commercial Loans [Line Items]
Percentage of loan portfolio		7.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2014
Commercial Loans [Line Items]
Percentage of loan portfolio		19.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2013
Commercial Loans [Line Items]
Percentage of loan portfolio		16.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2012
Commercial Loans [Line Items]
Percentage of loan portfolio		31.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2011
Commercial Loans [Line Items]
Percentage of loan portfolio		23.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2010
Commercial Loans [Line Items]
Percentage of loan portfolio		4.00%
Commercial Loans Held For Sale
Commercial Loans [Line Items]
Number of loans | loan		4	13
Principal value		$ 39,000	$ 163,000
Carrying value	[1]	39,141	166,234
Senior commercial loans, held for sale		618,000	904,000
Sale of loan for third party, held for sale		741,000	791,000
Valuation adjustments		10,000	$ 21,000
Loan pledged as collateral		$ 18,000
Commercial Loans Held For Investment
Commercial Loans [Line Items]
Number of loans | loan		3	3
Principal value		$ 67,000	$ 68,000
Carrying value	[1]	363,506	400,693
Loans at fair value		67,657	71,262
Commercial Loans Held-for-Investment, at Fair Value, B-Notes
Commercial Loans [Line Items]
Carrying value		$ 5,000	$ 5,000
[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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Loans and Leases Receivable, Yield Maintenance Fees Received

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Loans Financed through Securitization

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Percentage Of Loan Portfolio

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Excludes loans and leases covered under loss sharing agreements.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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The cash outflow associated with purchasing loans held for investment purposes during the period.

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