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Long-Term Debt - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2014 | Mar. 31, 2013 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Transition period for subsidiary to be a FHLB-member |  |  |  |  |  | 5 years |  |
Existing debt |  |  |  | $ 0 |  | $ 0 |  | $ 0
Federal home loan bank stock |  |  |  | 43,393,000 |  | 43,393,000 |  | 34,437,000
Accrued interest payable |  |  |  | 3,000,000 |  | 3,000,000 |  | 2,000,000
Accrued interest payable balance on long-term debt (less than) | [1] |  |  | $ 9,515,000 |  | 9,515,000 |  | 8,936,000
Exchangeable Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense yield |  |  |  | 6.52% | 6.58% |  | 6.51% |
Senior Notes due 2018 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense yield |  |  |  | 5.37% | 5.41% |  | 5.39% |
Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commercial mortgage loans |  |  |  | $ 65,000,000 |  | 65,000,000 |  |
Convertible Debt | Exchangeable Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible notes |  | $ 205,000,000 |  | 201,000,000 |  | $ 201,000,000 |  |
Debt Instrument interest rate |  | 5.625% |  |  |  |  |  |
Debt instrument maturity year |  | 2019 |  |  |  |  |  |
Debt instrument redemption date |  | Nov. 15, 2019 |  |  |  |  |  |
Net proceeds from issuance of convertible debt |  | $ 198,000,000 |  |  |  |  |  |
Interest expense yield |  |  |  |  |  | 6.53% |  |
Accrued interest payable |  |  |  | 2,000,000 |  | $ 2,000,000 |  |
Unamortized Debt Issuance Expense |  |  |  | $ (5,000,000) |  | $ (5,000,000) |  |
Convertible senior notes conversion rate |  |  |  |  |  | 0.0461798 |  |
Convertible senior notes conversion per share |  |  |  | $ 21.65 |  | $ 21.65 |  |
Amount of debt repurchased |  |  |  | $ 4,000,000 |  | $ 4,000,000 |  |
Convertible Debt | Exchangeable Senior Notes | Gain (loss) on investments |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  | $ 300,000 |  |
Convertible Debt | Convertible Senior Notes Due 2018 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible notes |  |  | $ 288,000,000 |  |  |  |  |
Debt Instrument interest rate |  |  | 4.625% |  |  |  |  |
Net proceeds from issuance of convertible debt |  |  | $ 279,000,000 |  |  |  |  |
Interest expense yield |  |  |  |  |  | 5.38% |  |
Accrued interest payable |  |  |  | 3,000,000 |  | $ 3,000,000 |  |
Unamortized Debt Issuance Expense |  |  |  | $ (3,000,000) |  | $ (3,000,000) |  |
Convertible senior notes conversion rate |  |  |  |  |  | 0.041132 |  |
Convertible senior notes conversion per share |  |  |  | $ 24.31 |  | $ 24.31 |  |
Trust Preferred Securities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense yield |  |  |  | 2.97% | 2.63% | 2.91% | 2.58% |
Debt instrument face amount |  |  |  | $ 99,500,000 |  | $ 99,500,000 |  |
Percentage of yield of debt securities |  |  |  | 6.87% | 6.85% | 6.86% | 6.85% |
Accrued interest payable balance on long-term debt (less than) |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  | 1,000,000
Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense yield |  |  |  |  |  | 2.91% | 2.58% |
Debt instrument face amount |  |  |  | 40,000,000 |  | $ 40,000,000 |  |
Percentage of yield of debt securities |  |  |  |  |  | 6.86% | 6.85% |
Accrued interest payable balance on long-term debt (less than) |  |  |  | 1,000,000 |  | $ 1,000,000 |  |
FHLB Chicago |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Federal home loan bank advances, reset period of basis margin |  |  |  |  |  | 91 days |  |
FHLB Chicago | Residential Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loans pledged as collateral under borrowing agreement with FHLBC |  |  |  | 2,270,000,000 |  | $ 2,270,000,000 |  |
FHLB Member Subsidiary | FHLB Chicago |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing limit |  |  |  | 2,000,000,000 |  | 2,000,000,000 |  |
Additional borrowings from FHLBC |  |  |  | 0 |  | 519,000,000 |  |
Existing debt |  |  |  | 2,000,000,000 |  | 2,000,000,000 |  |
Federal home loan bank advances outstanding |  |  |  | $ 2,000,000,000 |  | $ 2,000,000,000 |  | $ 1,480,000,000
Weighted average interest rate |  |  |  | 0.57% |  | 0.57% |  | 0.46%
Weighted average maturity |  |  |  |  |  | 9 years |  | 9 years
Outstanding advances classified as long-term debt |  |  |  |  |  |  |  | $ 1,340,000,000
[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 June 30, 2016 and December 31, 2015, assets of consolidated VIEs totaled $888,026 and $1,195,574, respectively. At June 30, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $860,256 and $1,050,861, respectively. See Note 4 for further discussion.

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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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