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Derivatives - Schedule of Long Positions in TBA (Details) - TBA securities - Not Designated as Hedging Instrument, Trading - Long position - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Derivative [Line Items] |  |  |
Implied market value, TBA | [1] | $ 1,569,011 | $ 2,751,568
Implied cost basis, TBA | [2] | 1,590,392 | 2,772,920
Derivative, Fair Value, Net | [3] | $ (21,381) | $ (21,352)
[1] | Implied market value represents the estimated fair value of the underlying Agency MBS as of the dates indicated
[2] | Implied cost basis represents the forward price to be paid for the underlying Agency MBS as of the dates indicated.
[3] | Net carrying value is the amount included on the consolidated balance sheets within “derivative assets” and “derivative liabilities” and represents the difference between the implied market value and the implied cost basis of the TBA securities as of the dates indicated.

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 + Details
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