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Mortgage-Backed Securities - Gross Unrealized Losses (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Investments [Line Items] |  |
Allowance for credit loss | $ 0 | $ 0
Agency MBS |  |
Investments [Line Items] |  |
Fair value, Less than 12 Months | 1,716 | 3,926
Gross Unrealized Losses, Less than 12 Month | $ (39) | $ (149)
Number of Securities, Less than 12 Months | 4 | 4
Fair value, 12 Months or Longer | $ 877,215 | $ 932,682
Gross Unrealized Losses, 12 Months or Longer | $ (137,426) | $ (158,651)
Number of Securities, 12 Months or Longer | 68 | 78
Non-Agency MBS |  |
Investments [Line Items] |  |
Fair value, Less than 12 Months | $ 562 | $ 1,736
Gross Unrealized Losses, Less than 12 Month | $ (70) | $ (37)
Number of Securities, Less than 12 Months | 1 | 8
Fair value, 12 Months or Longer | $ 7,813 | $ 21,704
Gross Unrealized Losses, 12 Months or Longer | $ (267) | $ (989)
Number of Securities, 12 Months or Longer | 14 | 41

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