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Long-Term Debt - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2014 | Mar. 31, 2013 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |
Transition period for subsidiary to be a FHLB-member |  |  |  | 5 years |  |
Existing debt |  |  |  | $ 0 |  | $ 0
Federal home loan bank stock |  |  |  | 44,071,000 |  | 34,437,000
Accrued interest payable |  |  |  | 3,000,000 |  | 2,000,000
Accrued interest payable balance on long-term debt (less than) | [1] |  |  | $ 15,522,000 |  | 8,936,000
Exchangeable Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense yield |  |  |  | 6.54% | 6.52% |
Senior Notes due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense yield |  |  |  | 5.41% | 5.36% |
FHLB Chicago |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Federal home loan bank advances, reset period of basis margin |  |  |  | 91 days |  |
FHLB Member Subsidiary | FHLB Chicago |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing limit |  |  |  | $ 2,000,000,000 |  |
Additional borrowings from FHLBC |  |  |  | 519,000,000 |  |
Existing debt |  |  |  | 2,000,000,000 |  |
Federal home loan bank advances outstanding |  |  |  | $ 2,000,000,000 |  | 1,480,000,000
Outstanding advances classified as long-term debt |  |  |  |  |  | $ 1,340,000,000
Weighted average interest rate |  |  |  | 0.58% |  | 0.46%
Weighted average maturity |  |  |  | 9 years |  | 9 years
Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commercial mortgage loans |  |  |  | $ 65,000,000 |  |
Convertible Debt | Exchangeable Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible notes |  | $ 205,000,000 |  | 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 |  |  |  |
Accrued interest payable |  |  |  | 4,000,000 |  |
Unamortized Debt Issuance Expense |  |  |  | $ 5,000,000 |  |
Convertible senior notes conversion rate |  |  |  | 0.0461798 |  |
Convertible senior notes conversion per share |  |  |  | $ 21.65 |  |
Amount of debt repurchased |  |  |  | $ 4,000,000 |  |
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 |  |  |
Accrued interest payable |  |  |  | 7,000,000 |  |
Unamortized Debt Issuance Expense |  |  |  | $ 4,000,000 |  |
Convertible senior notes conversion rate |  |  |  | 0.041132 |  |
Convertible senior notes conversion per share |  |  |  | $ 24.31 |  |
Trust Preferred Securities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense yield |  |  |  | 2.85% | 2.52% |
Debt instrument face amount |  |  |  | $ 100,000,000 |  |
Percentage of yield of debt securities |  |  |  | 6.86% | 6.81% |
Accrued interest payable balance on long-term debt (less than) |  |  |  | $ 1,000,000 |  | $ 1,000,000
Subordinated Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest expense yield |  |  |  | 2.85% | 2.52% |
Debt instrument face amount |  |  |  | $ 40,000,000 |  |
Percentage of yield of debt securities |  |  |  | 6.86% | 6.81% |
Accrued interest payable balance on long-term debt (less than) |  |  |  | $ 1,000,000 |  |
Gain (Loss) on Investments [Member] | Convertible Debt | Exchangeable Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gains on extinguishment of debt |  |  |  | $ 300,000 |  |
[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 March 31, 2016 and December 31, 2015, assets of consolidated VIEs totaled $1,102,195 and $1,195,574, respectively. At March 31, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $959,464 and $1,050,861, respectively. See Note 4 for further discussion.

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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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Data Type: | na
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