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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Accounting Policies [Abstract] |  |  |
Future lease commitments with expiration date |  | $ 17,978 |
Offsetting Asset and Liabilities [Line Items] |  |  |
Net Amounts of Assets Presented in Consolidated Balance Sheet | [1] | 11,948 | $ 36,595
Gross Amounts of Recognized Liabilities, Including Assets Under Repurchase Agreements |  | (1,050,417) | (854,067)
Gross Amounts Offset in Consolidated Balance Sheet Including Assets Under Repurchase Agreement |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | [1] | (65,238) | (66,329)
Net Amounts of Liabilities Presented in Consolidated Balance Sheet Including Assets Under Repurchase Agreement |  | (1,050,417) | (854,067)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments Including Assets Under Repurchase Agreement |  | 994,505 | 803,211
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged Including Assets Under Repurchase Agreement |  | 55,749 | 50,111
Net Amount Including Assets Under Repurchase Agreement |  | (163) | (745)
Interest Rate Agreement, TBAs, And Futures |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 6,952 | 33,280
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 6,952 | 33,280
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | (6,450) | (11,672)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | (298) | (9,148)
Net Amount |  | 204 | 12,460
Interest rate agreements |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 3,942 | 24,980
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 3,942 | 24,980
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | (3,644) | (7,736)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | (298) | (4,784)
Net Amount |  | 0 | 12,460
Gross Amounts of Recognized Liabilities |  | (57,994) | (56,919)
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (57,994) | (56,919)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 3,644 | 7,736
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 54,350 | 49,183
Net Amount |  | 0 | 0
TBAs |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 2,875 | 8,300
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 2,875 | 8,300
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | (2,806) | (3,936)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 0 | (4,364)
Net Amount |  | 69 | 0
Gross Amounts of Recognized Liabilities |  | (3,946) | (4,681)
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (3,946) | (4,681)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 2,807 | 3,936
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 976 | 0
Net Amount |  | (163) | (745)
Futures |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 135 |
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 |
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 135 |
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | 0 |
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 0 |
Net Amount |  | 135 |
Gross Amounts of Recognized Liabilities |  | (423) | (928)
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (423) | (928)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 0 | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 423 | 928
Net Amount |  | 0 | 0
Loan warehouse debt |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Liabilities - Under Repurchase Agreements |  | (438,243) | (485,544)
Gross Amounts Offset in Consolidated Balance Sheet - Under Repurchase Agreement |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet - Under Repurchase Agreement |  | (438,243) | (485,544)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments - Under Repurchase Agreement |  | 438,243 | 485,544
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged - Under Repurchase Agreement |  | 0 | 0
Security repurchase agreements |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Liabilities - Under Repurchase Agreements |  | (549,811) | (305,995)
Gross Amounts Offset in Consolidated Balance Sheet - Under Repurchase Agreement |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet - Under Repurchase Agreement |  | (549,811) | (305,995)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments - Under Repurchase Agreement |  | 549,811 | 305,995
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged - Under Repurchase Agreement |  | 0 | 0
Net Amount - Under Repurchase Agreement |  | $ 0 | $ 0
[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, 2017 and December 31, 2016, assets of consolidated VIEs totaled $995,768 and $798,317, respectively. At September 30, 2017 and December 31, 2016, liabilities of consolidated VIEs totaled $945,873 and $773,980, respectively. See Note 4 for further discussion.

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