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Commercial Loans - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) loan Contract	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) loan Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Senior commercial loans, held for sale				$ 8,794,939	$ 6,844,403
Aggregate fair value		$ 468,157		468,157		$ 566,927
Sale of loan for third party, held for sale				$ 7,741,024	5,328,901
Commercial Loans Held For Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan				7		13
Principal balance		78,000		$ 78,000		$ 163,000
Aggregate fair value	[1]	80,756		80,756		$ 166,234
Sale of loan for third party, held for sale		254,000		602,000
Valuation adjustments		4,000	$ 4,000	11,000	$ 14,000
Loan pledged as collateral		53,000		$ 53,000
Commercial Loans Held-for-Investment, at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | Contract				3		3
Principal balance		67,000		$ 67,000		$ 68,000
Commercial Loans Held-for-Investment, at Amortized Cost
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Financed through Securitization		180,000		$ 180,000		$ 195,000
Number of loans | Contract				62		60
Aggregate fair value		317,305		$ 317,305		$ 329,431
Acquired amount of loans held for investment		13,000		22,000
Recorded investment in loans		$ 324,646		$ 324,646		336,888
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%		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		18.00%		18.00%
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		15.00%		15.00%
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		32.00%		32.00%
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		24.00%		24.00%
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%		4.00%
Commercial Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at fair value		$ 70,096		$ 70,096		71,262
Aggregate fair value	[1]	387,401		387,401		400,693
Commercial Loans Held-for-Investment, at Fair Value, B-Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate fair value		5,000		5,000		$ 5,000
Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Senior commercial loans, held for sale		$ 168,000		$ 518,000
[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 September 30, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,539,350 and $1,900,208, respectively. At September 30, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,179,884 and $1,546,490, respectively. See Note 4 for further discussion.

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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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