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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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