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Commercial Loans - Additional Information (Detail) $ in Thousands | 12 Months Ended
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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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- Definition Loans and Leases Receivable, Yield Maintenance Fees Received + References No definition available. + Details
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- Definition Loans Financed through Securitization + References No definition available. + Details
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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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- Definition The cash outflow associated with purchasing loans held for investment purposes during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=34726456&loc=d3e60097-112785 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3461-108585 + Details
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