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Investment Securities Available For Sale, at Fair Value - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Accrued interest | $ 32,200,000 |  | $ 32,200,000 |  | $ 22,400,000
Unrealized gains on investment securities available for sale | 47,800,000 | $ 58,300,000 | 148,800,000 | $ 10,400,000 |
Sales proceeds | $ 0 | 0 | 663,336,000 | 0 |
Realized loss on write-downs |  |  | $ (26,818,000) |  |
Contractual maturities (up to) |  |  | 38 years |  |
Weighted average life of available for sale securities portfolio |  |  | 6 years 6 months |  | 7 years 4 months 24 days
Agency RMBS IOs |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized loss on write-downs |  |  | $ (2,500,000) |  |
Non-Agency RMBS |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Sales proceeds |  |  | 4,573,000 |  |
Realized loss on write-downs |  | $ (400,000) | $ 52,000 | $ (900,000) |

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- Definition Amount, after allowance for credit loss, of accrued interest 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 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3B + Details
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