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Residential 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 ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying value |  | $ 3,928,803 | $ 3,398,573 |
Principal balance of loans sold during period |  | 9,040,000 | 7,900,000 |
Transfers from loans held-for-sale to loans held-for-investment |  | 1,555,814 | 633,707 | $ 0
Transfers from loans held-for-investment to loans held-for-sale |  | 154,012 | 0 | $ 0
Sequoia |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying value |  | $ 1,021,870 | $ 1,474,386 |
Fixed Rate Residential Mortgage |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Weighted average rate on loans |  | 4.07% |  |
Residential Loans | FHLB Chicago |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Residential mortgage loans securing FHLB advances |  | $ 1,680,000 |  |
Residential Loans at Fair Value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 1,763 | 2,273 |
Principal value |  | $ 1,090,000 | $ 1,300,000 |
Carrying value |  | $ 1,110,000 | $ 1,340,000 |
Number of loans in foreclosure | loan |  | 1 | 1 |
Principal value |  | $ 10,210,000 | $ 8,810,000 |
Valuation adjustments |  | (4,000) | $ (51,000) |
Loan pledged as collateral |  | 1,070,000 |  |
Loans held as assets amount in foreclosure |  | $ 1,000 |  |
Residential Loans at Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans past due | loan |  | 2 | 0 |
Residential Loans Held for Investment |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 4,545 | 5,315 |
Principal value |  | $ 1,122,415 | $ 1,483,213 |
Carrying value |  | 1,021,870 | 1,474,386 |
Unamortized premium, net |  | 0 | 12,511 |
Allowance for loan losses |  | $ 0 | $ 21,338 |
Residential Loans at Lower of Cost or Fair Value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 9 | 9 |
Principal value |  | $ 2,000 | $ 2,000 |
Carrying value |  | $ 1,433 | $ 1,488 |
Number of loans in foreclosure | loan |  | 1 | 1 |
Residential Loans at Lower of Cost or Fair Value | Sequoia |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying value |  | $ 0 | $ 0 |
Residential Loans at Lower of Cost or Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans past due | loan |  | 2 | 0 |
Residential Loans Held For Investment at Fair Value |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 2,398 | 804 |
Principal value |  | $ 1,758,990 | $ 566,372 |
Carrying value |  | $ 1,790,000 | $ 580,000 |
Number of loans in foreclosure | loan |  | 0 | 1 |
Valuation adjustments |  | $ (6,000) | $ (1,000) |
Transfers from loans held-for-sale to loans held-for-investment |  | 1,500,000 | 583,000 |
Transfers from loans held-for-investment to loans held-for-sale |  | $ 143,000 | 0 |
FICO credit score |  | 772 |  |
Loan to value ratio |  | 65.00% |  |
Percentage of loans with fixed interest rate |  | 97.00% |  |
Residential Loans Held For Investment at Fair Value | Sequoia |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 4,545 |  |
FICO credit score |  | 729 |  |
Loan to value ratio |  | 66.00% |  |
Loans held as assets, 90 days or more past due |  | $ 59,000 | 70,000 |
Loans held as assets amount in foreclosure |  | 32,000 | 39,000 |
Valuation adjustments |  | $ 7,000 | $ 0 |
Residential Loans Held For Investment at Fair Value | Hybrid Residential Mortgages |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Weighted average rate on loans |  | 3.55% |  |
Residential Loans Held For Investment at Fair Value | Originated In 2014 and 2015 |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage of loan portfolio |  | 88.00% |  |
Residential Loans Held For Investment at Fair Value | Originated During 2013 |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage of loan portfolio |  | 6.00% |  |
Residential Loans Held For Investment at Fair Value | Originated In 2012 And Prior Years |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage of loan portfolio |  | 6.00% |  |
Residential Loans Held For Investment at Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans past due | loan |  | 0 | 0 |
Residential Loans Held For Sale |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan |  | 1,772 | 2,282 |
Principal value |  | $ 1,091,518 | $ 1,305,493 |
Carrying value | [1] | 1,115,738 | $ 1,342,519 |
Mortgage Servicing Rights |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Mortgage servicing rights |  | $ 2,230,000 |  |
[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 Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. 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 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 Reference 2: 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 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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