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Investment Securities Available For Sale, at Fair Value - Schedule of Realized Gain or Loss Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | $ 0 | $ 0 | $ 663,336,000 | $ 0
Realized Gains |  |  | 3,752,000 |
Realized Losses |  |  | (30,570,000) |
Net Realized Gains (Losses) |  |  | (26,818,000) |
U.S. Treasury securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 658,763,000 |
Realized Gains |  |  | 3,700,000 |
Realized Losses |  |  | (30,570,000) |
Net Realized Gains (Losses) |  |  | (26,870,000) |
Non-Agency RMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 4,573,000 |
Realized Gains |  |  | 52,000 |
Realized Losses |  |  | 0 |
Net Realized Gains (Losses) |  | $ (100,000) | $ 52,000 | $ (500,000)

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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