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Commitments and Contingencies - Additional Information (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) loan tranche lease | Jul. 01, 2022 USD ($) | Sep. 30, 2023 USD ($) loan tranche lease | Sep. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) loan tranche lease repurchase_request | Sep. 30, 2022 USD ($) repurchase_request loan | Dec. 31, 2021 USD ($) | Dec. 31, 2018 partnership | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) loan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, number of leases | lease |  | 10 |  | 10 |  |  | 10 |  |  |  |  |  |  |
Present value of remaining lease payments |  | $ 17,535,000 |  | $ 17,535,000 |  |  | $ 17,535,000 |  |  |  |  |  |  |
Operating lease expense |  |  |  |  |  |  | $ 4,000,000 | $ 4,000,000 |  |  |  |  |  |
Lessee, number of office leases | lease |  | 1 |  | 1 |  |  | 1 |  |  |  |  |  |  |
Operating lease liabilities |  | $ 15,630,000 |  | $ 15,630,000 |  |  | $ 15,630,000 |  |  |  |  | $ 18,563,000 |  |
Operating lease liability, statement of financial position [Extensible List] |  | Accounts Payable and Accrued Liabilities |  | Accounts Payable and Accrued Liabilities |  |  | Accounts Payable and Accrued Liabilities |  |  |  |  |  |  |
Operating lease right-of-use assets |  | $ 13,367,000 |  | $ 13,367,000 |  |  | $ 13,367,000 |  |  |  |  | 16,177,000 |  |
Operating lease right-of-use asset, statement of financial position [Extensible List] |  | Other assets |  | Other assets |  |  | Other assets |  |  |  |  |  |  |
Weighted average remaining lease term |  | 4 years |  | 4 years |  |  | 4 years |  |  |  |  |  |  |
Discount rate (as a percent) |  | 5.20% |  | 5.20% |  |  | 5.20% |  |  |  |  |  |  |
Derivative liabilities | [1] | $ 8,781,000 |  | $ 8,781,000 |  |  | $ 8,781,000 |  |  |  |  | 16,855,000 |  |
Gain (loss) on market valuation adjustments |  |  |  | 16,318,000 | $ (50,893,000) |  | 1,275,000 | (183,487,000) |  |  |  |  |  |
Number of partnerships, committed to fund | partnership |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Guarantee obligations |  | 5,913,000 |  | 5,913,000 |  |  | 5,913,000 |  |  |  |  | 6,344,000 |  |
Guarantee obligations, credit reserve |  | 5,000,000 |  | 5,000,000 |  |  | 5,000,000 |  |  |  |  |  |  |
Special purpose entities assets |  | 28,000,000 |  | 28,000,000 |  |  | 28,000,000 |  |  |  |  | 30,000,000 |  |
Special purpose entities liabilities |  | 6,000,000 |  | 6,000,000 |  |  | 6,000,000 |  |  |  |  | 6,000,000 |  |
Residential repurchase reserve |  | 4,611,000 |  | 4,611,000 |  |  | 4,611,000 |  |  |  |  | 7,051,000 |  |
Residential loans repurchase (reversal) provision |  |  |  |  |  |  | 1,000,000 | $ 4,000,000 |  |  |  |  |  |
Aggregate amount of loss contingency reserves |  | 2,000,000 |  | 2,000,000 |  |  | 2,000,000 |  |  |  |  |  |  |
Riverbend Funding, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnout period |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Potential future payments on loans |  |  | $ 25,300,000 |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  | 0 |  | 0 |  |  | 0 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from arrangements |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Residential Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance |  | 658,540,000 |  | 658,540,000 |  |  | 658,540,000 |  |  |  |  | 822,063,000 |  |
Fair value of loans |  | $ 610,946,000 |  | $ 610,946,000 |  |  | $ 610,946,000 |  |  |  |  | $ 780,781,000 |  |
Number of loans in foreclosure | loan |  | 0 |  | 0 |  |  | 0 |  |  |  |  | 0 |  |
Business Purpose Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential repurchase reserve |  | $ 0 |  | $ 0 |  |  | $ 0 |  |  |  |  | $ 1,000,000 |  |
Number of residential repurchase requests (in repurchase requests) | repurchase_request |  |  |  |  |  |  | 6 | 0 |  |  |  |  |  |
Number of loans repurchased | loan |  |  |  |  |  |  | 12 | 0 |  |  |  |  |  |
Repurchase request outstanding |  | 0 |  | 0 |  |  | $ 0 |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income related to risk sharing agreement |  |  |  | 200,000 |  |  | 500,000 |  |  |  |  |  |  |
Guarantee Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future payments on loans |  | 44,000,000 |  | 44,000,000 |  |  | 44,000,000 |  |  |  |  |  |  |
Original unpaid balance of loans subject to risk sharing agreements |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,190,000,000 | $ 3,190,000,000
Unpaid principal balance |  | $ 406,000,000 |  | $ 406,000,000 |  |  | $ 406,000,000 |  |  |  |  |  |  |
Weighted average original FICO score |  | 761 |  | 761 |  |  | 761 |  |  |  |  |  |  |
Weighted average original loan-to-value (LTV) |  | 74.00% |  | 74.00% |  |  | 74.00% |  |  |  |  |  |  |
Guarantee Obligations | Residential Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans in foreclosure | tranche |  | 3 |  | 3 |  |  | 3 |  |  |  |  |  |  |
Unpaid principal balance of loans in foreclosure |  | $ 1,000,000 |  | $ 1,000,000 |  |  | $ 1,000,000 |  |  |  |  |  |  |
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of loans |  | 7,000,000 |  | 7,000,000 |  |  | 7,000,000 |  |  |  |  |  |  |
Repurchase Reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential repurchase reserve |  | 5,000,000 |  | 5,000,000 |  |  | $ 5,000,000 |  |  |  |  | $ 6,000,000 |  |
Number of residential repurchase requests (in repurchase requests) | repurchase_request |  |  |  |  |  |  | 1 | 7 |  |  |  |  |  |
Number of loans repurchased | loan |  |  |  |  |  |  | 5 | 1 |  |  |  |  |  |
BPL Bridge Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed contribution |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Capital contribution |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Commitment To Fund Residential Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments made |  | 623,000,000 |  | 623,000,000 |  |  | $ 623,000,000 |  |  |  |  |  |  |
Derivative liabilities |  | 1,000,000 |  | 1,000,000 |  |  | 1,000,000 |  |  |  |  |  |  |
Gain (loss) on market valuation adjustments |  |  |  | (400,000) |  |  | 300,000 |  |  |  |  |  |  |
Commitment To Fund Strategic Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments made |  | 15,000,000 |  | 15,000,000 |  |  | 15,000,000 |  |  |  |  |  |  |
Payments for other commitments |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |
Commitment To Fund RWT Horizons Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other commitments made |  | $ 2,000,000 |  | $ 2,000,000 |  |  | $ 2,000,000 |  |  |  |  |  |  |
Payments for other commitments |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
[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 September 30, 2023 and December 31, 2022, assets of consolidated VIEs totaled $9,639,117 and $9,257,291, respectively. At September 30, 2023 and December 31, 2022, liabilities of consolidated VIEs totaled $8,635,696 and $8,270,276, respectively. See Note 4 for further discussion.

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