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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) facility | Dec. 31, 2019 USD ($) facility
Short-term Debt [Line Items] |  |  |
Outstanding Balance | [1] | $ 522,609,000 | $ 2,329,145,000
Line of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | facility |  | 9 | 22
Outstanding Balance |  | $ 314,234,000 | $ 2,176,591,000
Line of Credit | Residential loan warehouse |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | facility |  | 4 | 4
Outstanding Balance |  | $ 137,269,000 | $ 185,894,000
Limit |  | $ 1,300,000,000 | $ 1,425,000,000
Weighted Average Interest Rate |  | 2.45% | 3.23%
Weighted Average Days Until Maturity |  | 268 days | 69 days
Line of Credit | Business purpose loans |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | facility |  | 2 | 8
Outstanding Balance |  | $ 99,190,000 | $ 814,118,000
Limit |  | $ 500,000,000 | $ 1,475,000,000
Weighted Average Interest Rate |  | 3.37% | 4.11%
Weighted Average Days Until Maturity |  | 521 days | 489 days
Line of Credit | Real estate securities repo |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | facility |  | 3 | 10
Outstanding Balance |  | $ 77,775,000 | $ 1,176,579,000
Limit |  | $ 0 | $ 0
Weighted Average Interest Rate |  | 2.24% | 2.94%
Weighted Average Days Until Maturity |  | 36 days | 23 days
Servicer advance financing |  |  |
Short-term Debt [Line Items] |  |  |
Number of Facilities | facility |  | 1 | 1
Outstanding Balance |  | $ 208,375,000 | $ 152,554,000
Limit |  | $ 335,000,000 | $ 400,000,000
Weighted Average Interest Rate |  | 1.95% | 3.56%
Weighted Average Days Until Maturity |  | 334 days | 335 days
[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 December 31, 2020 and December 31, 2019, assets of consolidated VIEs totaled $8,141,069 and $11,931,869, respectively. At December 31, 2020 and December 31, 2019, liabilities of consolidated VIEs totaled $7,148,414 and $10,717,072, respectively. See Note 4 for further discussion.

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