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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |  |
Future lease commitments with expiration date |  | $ 17,110 |
Offsetting Asset and Liabilities [Line Items] |  |  |
Net Amounts of Assets Presented in Consolidated Balance Sheet | [1] | 63,544 | $ 15,718
Gross Amounts of Recognized Liabilities, Including Assets Under Repurchase Agreements |  | (1,306,403) | (1,747,787)
Gross Amounts Offset in Consolidated Balance Sheet Including Assets Under Repurchase Agreement |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | [1] | (56,201) | (63,081)
Net Amounts of Liabilities Presented in Consolidated Balance Sheet Including Assets Under Repurchase Agreement |  | (1,306,403) | (1,747,787)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments Including Assets Under Repurchase Agreement |  | 1,266,877 | 1,694,741
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged Including Assets Under Repurchase Agreement |  | 38,283 | 50,747
Net Amount Including Assets Under Repurchase Agreement |  | (1,243) | (2,299)
Interest Rate Agreement, TBAs, And Futures |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 59,544 | 10,298
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 59,544 | 10,298
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | (12,801) | (6,329)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | (16,653) | (42)
Net Amount |  | 30,090 | 3,927
Interest rate agreements |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 50,919 | 10,164
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 50,919 | 10,164
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | (8,850) | (6,196)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | (12,010) | (42)
Net Amount |  | 30,059 | 3,926
Gross Amounts of Recognized Liabilities |  | (46,513) | (55,567)
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (46,513) | (55,567)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 8,850 | 6,196
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 37,663 | 49,371
Net Amount |  | 0 | 0
TBAs |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  | 8,625 | 133
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 8,625 | 133
Gross Amounts Not Offset in Consolidated Balance Sheet - Financial Instruments |  | (3,951) | (133)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | (4,643) | 0
Net Amount |  | 31 | 0
Gross Amounts of Recognized Liabilities |  | (5,457) | (3,808)
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (5,457) | (3,808)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 3,951 | 133
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 263 | 1,376
Net Amount |  | (1,243) | (2,299)
Futures |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Assets |  |  | 1
Gross Amounts Offset in Consolidated Balance Sheet |  |  | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet |  |  | 1
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 |  |  | 1
Gross Amounts of Recognized Liabilities |  | (357) |
Gross Amounts Offset in Consolidated Balance Sheet |  | 0 |
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (357) |
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 0 |
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 357 |
Net Amount |  | 0 |
Loan warehouse debt |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |
Gross Amounts of Recognized Liabilities - Under Repurchase Agreements |  | (661,782) | (1,039,666)
Gross Amounts Offset in Consolidated Balance Sheet - Under Repurchase Agreement |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet - Under Repurchase Agreement |  | (661,782) | (1,039,666)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments - Under Repurchase Agreement |  | 661,782 | 1,039,666
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 |  | (592,294) | (648,746)
Gross Amounts Offset in Consolidated Balance Sheet - Under Repurchase Agreement |  | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet - Under Repurchase Agreement |  | (592,294) | (648,746)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments - Under Repurchase Agreement |  | 592,294 | 648,746
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 March 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $1,647,850 and $1,259,774, respectively. At March 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $1,546,066 and $1,167,157, respectively. See Note 4 for further discussion.

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