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Commercial Loans - Additional Information (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Senior commercial loans, held for sale		$ 1,245,068	$ 2,558,425
Aggregate fair value		363,893		$ 402,647
Sale of loan for third party, held for sale		$ 1,336,617	$ 2,455,452
Commercial Loans Held For Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan		0	4
Principal balance				39,000
Aggregate fair value	[1]	$ 0		39,141
Sale of loan for third party, held for sale		76,000	$ 203,000
Valuation adjustments		0	$ 6,000
Commercial Loans Held-for-Investment, at Amortized Cost
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Financed through Securitization		$ 165,000		166,000
Number of loans | loan		58	59
Aggregate fair value		$ 294,219		295,849
Loan pledged as collateral		7,000		135,000
Recorded investment in loans		$ 301,609		302,951
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		7.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		19.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		16.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		31.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		23.00%
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year		4.00%
Commercial Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan		3
Principal balance		$ 67,000		67,000
Loans at fair value		69,674		67,657
Aggregate fair value	[1]	363,893		363,506
Commercial Loans Held-for-Investment, at Fair Value, B-Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate fair value		4,000		$ 5,000
Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Senior commercial loans, held for sale		$ 38,000	$ 93,000
[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 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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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 aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

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