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Short-Term Debt - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2019 | Dec. 31, 2022 | Jul. 01, 2022
Short-term Debt [Line Items] |  |  |  |  |
Average balance of short-term debt | $ 1,020,000 | $ 1,140,000 |  |  |
Accrued interest payable on short-term debt | 5,000 | 5,000 |  | $ 5,000 |
Convertible notes |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Repurchased debt instrument | 2,000 | 66,000 |  |  |
Gain on extinguishment of debt | $ 20 | $ 200 |  |  |
Riverbend Funding, LLC | Minimum |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Fixed interest rate (as a percentage) |  |  |  |  | 6.00%
Riverbend Funding, LLC | Maximum |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Fixed interest rate (as a percentage) |  |  |  |  | 8.00%
Recourse Subordinate Securities Financing Receivable | Redwood |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  | 4.21% |  |
Recourse Subordinate Securities Financing Receivable | Redwood | October 2022 through September 2023 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  | 5.71% |  |
Recourse Subordinate Securities Financing Receivable | Redwood | October 2023 through September 2024 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Long-term debt, weighted average interest rate, over time |  |  | 7.21% |  |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481303/470-50-40-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481303/470-50-40-4 + Details
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (g) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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