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Fair Value of Financial Instruments - Level 3 Assets (Details) - Recurring basis - Level 3 - Residential whole loans, at fair value - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 6,441,964 | $ 5,252,047 | $ 5,676,430 | $ 4,222,584
Purchases and originations | 635,646 | 591,184 | 1,707,209 | 2,379,428
Draws | 166,937 | 106,633 | 418,928 | 250,455
Changes in fair value recorded in Net gain/(loss) on residential whole loans measured at fair value through earnings | (129,661) | (241,093) | (131,856) | (623,012)
Repayments | (309,214) | (236,236) | (836,440) | (718,983)
Loan sales | (2,243) | 0 | (3,720) | (10,496)
Transfer to REO | (10,007) | (9,565) | (37,129) | (37,006)
Balance at end of period | $ 6,793,422 | $ 5,462,970 | $ 6,793,422 | $ 5,462,970

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Originations And Draws + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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