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Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 Entity | Dec. 31, 2013
Variable Interest Entity [Line Items] |  |
Assets | $ 2,013,807 | $ 2,299,576
Liabilities | 1,657,782 | 1,944,911
Number of VIEs | 26 |
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,546,507 |
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 204,741 |
Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 233,311 |
Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 285 |
Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,915 |
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 25,048 |
Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,580 |
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,656,202 |
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,551,885 |
Liabilities | 1,485,785 |
Number of VIEs | 24 |
Sequoia | Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,546,507 |
Sequoia | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 147 |
Sequoia | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,882 |
Sequoia | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,349 |
Sequoia | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,034 |
Sequoia | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,484,751 |
Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 233,817 |
Liabilities | 56,515 |
Number of VIEs | 1 |
Residential Resecuritization | Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 233,311 |
Residential Resecuritization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 506 |
Residential Resecuritization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 7 |
Residential Resecuritization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 56,508 |
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 228,105 |
Liabilities | 115,482 |
Number of VIEs | 1 |
Commercial Securitization | Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 204,741 |
Commercial Securitization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 138 |
Commercial Securitization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,527 |
Commercial Securitization | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 21,699 |
Commercial Securitization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 539 |
Commercial Securitization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 114,943 |

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- Definition Number of Variable Interest Entities, Acquired and Consolidated + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
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