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Other Assets - Impact of Derivative Instruments on Earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Income on swap variable receive leg | $ 158,554 | $ 52,395 | $ 34
Expense on swap fixed pay leg | (51,400) | (42,353) | (703)
Unrealized mark-to-market gain/(loss) | (91,696) | 208,712 | 70
Net price alignment expense on margin collateral received | (11,697) | (2,762) | 0
Net gain on TBA short positions | 0 | 39,187 | 2,025
Total Net gain/(loss) on derivatives used for risk management purposes | $ 3,761 | $ 255,179 | $ 1,426

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- Definition Amount of realized gain (loss) from security sold short, classified as operating. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(a)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
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