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Fair Value of Financial Instruments - Level 3 Liabilities (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Weighted Average | Residential whole loan | Liquidation timeline (in years) | Liquidation model |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Fair Value Inputs, Liquidation Timeline |  | 1 year 10 months 24 days |  | 1 year 9 months 18 days |
Minimum | Residential whole loan | Liquidation timeline (in years) | Liquidation model |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Fair Value Inputs, Liquidation Timeline |  | 1 month 6 days |  | 9 months 18 days |
Maximum | Residential whole loan | Liquidation timeline (in years) | Liquidation model |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Fair Value Inputs, Liquidation Timeline |  | 4 years 6 months |  | 4 years 6 months |
Recurring basis | Agreements with Non-mark-to-market Collateral Provisions |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 377,252 | $ 469,424 | $ 440,106 | $ 469,424 | $ 578,879
Issuances | 0 |  | 107,230 | 112,740 | 379,625
Payment of principal | (154,989) |  | (145,983) | (359,901) | (557,151)
Change in unrealized losses | 0 |  | 0 | 0 | 0
Balance at end of period | 222,263 |  | 401,353 | 222,263 | 401,353
Recurring basis | Agreements with Mark-to-market Collateral Provisions |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance at beginning of period | 290,228 | $ 178,864 | 553,162 | 178,864 | 884,495
Issuances | 12,323 |  | 56,330 | 126,924 | 78,348
Payment of principal | (108,427) |  | (103,745) | (111,664) | (457,096)
Change in unrealized losses | 0 |  | 0 | 0 | 0
Balance at end of period | $ 194,124 |  | $ 505,747 | $ 194,124 | $ 505,747

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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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