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Asset-Backed Securities Issued - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |  |  |  |
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Dec. 31, 2023 | Dec. 31, 2053 | Dec. 31, 2052 | May 31, 2029 | May 29, 2029 | Mar. 31, 2029 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ 75,684,000 | [1] |  |  |  |  |  | $ 70,470,000 | [1] |  | $ 81,000,000 |
Other assets | [1] | 351,109,000 |  |  |  |  |  |  | 211,240,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary | HEI | Redemption beginning in October 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
ABS issued, at amortized cost |  | 139,000,000 |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | HEI | Redemption beginning in September 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
ABS issued, at amortized cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 146,000,000
CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 24 months through December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
ABS issued, at amortized cost |  | 231,000,000 |  |  |  |  |  |  |  |  |  |  |
CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 24 months through May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
ABS issued, at amortized cost |  |  |  |  |  |  |  |  |  |  | $ 215,000,000 |  |
CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 30 months through March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
ABS issued, at amortized cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 270,000,000
CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption beginning in November 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
ABS issued, at amortized cost |  | 184,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 Asset Backed Securities Sold | CoreVest | Redemption, first 24 months through December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 231,000,000 |  |  |  |  |  |  |  |  |  |  |
Bridge loan |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Other assets |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 Asset Backed Securities Sold | CoreVest | Redemption, first 24 months through May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 215,000,000 |  |  |  |  |  |  |  |  |  |  |
Bridge loan |  | 225,000,000 |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Other assets |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 Asset Backed Securities Sold | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 24 months through May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 213,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt discount |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 Asset Backed Securities Sold | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption beginning in November 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 178,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt discount |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Forecast | Redemption, first 30 months through March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  |  |  |  | 2.00% |  |  |  |  |
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Forecast | Redemption beginning in October 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Asset-backed Securities | Variable Interest Entity, Primary Beneficiary | Forecast | Redemption beginning in September 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 485,000,000 |  |  |  |  |  |  | 485,000,000 |  |  |  |
Asset-backed Securities | CoreVest | Redemption, first 24 months through December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Securitized asset backed securities, borrowing capacity |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest | Redemption, first 24 months through May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Securitized asset backed securities, borrowing capacity |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest | Redemption, first 30 months through March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Bridge loan |  | 287,000,000 |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 17,000,000 |  |  |  |  |  |  |  |  |  |  |
Other assets |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 24 months through December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 232,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 7.89% |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 24 months through May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 4.32% |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 30 months through March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 270,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt discount |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption beginning in November 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 7.50% |  |  |  |  |  |  |  |  |  |  |
Interest rate if no redemption right exercised |  | 10.50% |  |  |  |  |  |  |  |  |  |  |
Asset-backed Securities | Freddie Mac SLST |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 182,000,000 |  |  |  |  |  |  | $ 86,000,000 |  |  |  |
2021 Asset Backed Securities Sold | Variable Interest Entity, Primary Beneficiary | Forecast | Redemption, first 24 months through December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  |  | 1.50% |  |  |  |  |  |  |
2021 Asset Backed Securities Sold | Variable Interest Entity, Primary Beneficiary | Forecast | Redemption, first 24 months through May 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
2021 Asset Backed Securities Sold | CoreVest | Redemption, first 30 months through March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 270,000,000 |  |  |  |  |  |  |  |  |  |  |
Securitized asset backed securities, borrowing capacity |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |
2021 Asset Backed Securities Sold | CoreVest | Redemption beginning in November 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 182,000,000 |  |  |  |  |  |  |  |  |  |  |
2021 Asset Backed Securities Sold | CoreVest | Variable Interest Entity, Primary Beneficiary | Redemption, first 30 months through March 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 2.34% |  |  |  |  |  |  |  |  |  |  |
Contractual maturities of over five years | Asset-backed Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual maturities of ABS (in years) |  | 5 years |  |  |  |  |  |  |  |  |  |  |
[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, 2023 and 2022, assets of consolidated VIEs totaled $10,988,885 and $9,257,291, respectively. At December 31, 2023 and 2022, liabilities of consolidated VIEs totaled $10,096,308 and $8,270,276, respectively. See Note 4 for further discussion.

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