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Segment Information - Supplemental Information by Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |
Residential loans |  | $ 4,036,674 | $ 3,398,573 |
Commercial loans |  | 468,157 | 566,927 |
Real estate securities | [1] | 1,085,224 | 1,379,230 |
Mortgage servicing rights |  | 162,726 | 139,293 | [1]
Total assets | [1] | 6,269,026 | 5,918,966 |
Operating Segments | Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans |  | 1,506,151 | 1,342,519 |
Commercial loans |  | 0 | 0 |
Real estate securities |  | 0 | 93,802 |
Mortgage servicing rights |  | 0 | 0 |
Total assets |  | 1,563,306 | 1,468,856 |
Operating Segments | Residential Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans |  | 1,360,277 | 581,668 |
Commercial loans |  | 0 | 0 |
Real estate securities |  | 1,085,224 | 1,285,428 |
Mortgage servicing rights |  | 162,726 | 139,293 |
Total assets |  | 2,723,955 | 2,057,256 |
Operating Segments | Commercial Mortgage Banking and Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans |  | 0 | 0 |
Commercial loans |  | 468,157 | 566,927 |
Real estate securities |  | 0 | 0 |
Mortgage servicing rights |  | 0 | 0 |
Total assets |  | 475,924 | 575,943 |
Corporate/Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Residential loans |  | 1,170,246 | 1,474,386 |
Commercial loans |  | 0 | 0 |
Real estate securities |  | 0 | 0 |
Mortgage servicing rights |  | 0 | 0 |
Total assets |  | $ 1,505,841 | $ 1,816,911 |
[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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