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Investment Securities Available For Sale, at Fair Value - Realized Gain or Loss Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | $ 64,690 | $ 85,437 | $ 432,585
Realized Gains | 1,472 | 18,375 | 16,006
Realized Losses | (14,072) | (31) | (4,786)
Net Realized Gains (Losses) | (12,600) | 18,344 | 11,220
ABS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 595 | 36,215 |
Realized Gains | 0 | 18,001 |
Realized Losses | (41) | 0 |
Net Realized Gains (Losses) | (41) | 18,001 |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 30,419 |  | 132,797
Realized Gains | 0 |  | 11,083
Realized Losses | (1,387) |  | (452)
Net Realized Gains (Losses) | (1,387) |  | 10,631
Non-Agency RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 33,676 | 24,374 | 176,166
Realized Gains | 1,472 | 374 | 4,923
Realized Losses | (12,644) | 0 | (854)
Net Realized Gains (Losses) | $ (11,172) | 374 | 4,069
Agency RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds |  |  | 123,622
Realized Gains |  |  | 0
Realized Losses |  |  | (3,480)
Net Realized Gains (Losses) |  |  | $ (3,480)
U.S. Treasury Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds |  | 24,848 |
Realized Gains |  | 0 |
Realized Losses |  | (31) |
Net Realized Gains (Losses) |  | $ (31) |

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- Definition Proceeds Including Receivable For Unsettled Trades From Sale Of Debt Securities, Available-For-Sale + References No definition available. + Details
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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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