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Mortgage-Backed Securities - Gross Unrealized Losses (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Investments [Line Items] |  |
Allowance for credit loss | $ 0 | $ 0
Agency MBS |  |
Investments [Line Items] |  |
Fair value, Less than 12 Months | 3,926 | 346,064
Gross Unrealized Losses, Less than 12 Month | $ 149 | $ 22,808
Number of Securities, Less than 12 Months | 4 | 79
Fair value, 12 Months or Longer | $ 932,682 | $ 697,514
Gross Unrealized Losses, 12 Months or Longer | $ 158,651 | $ 156,411
Number of Securities, 12 Months or Longer | 78 | 17
Non-Agency MBS |  |
Investments [Line Items] |  |
Fair value, Less than 12 Months | $ 1,736 | $ 42,162
Gross Unrealized Losses, Less than 12 Month | $ 37 | $ 1,787
Number of Securities, Less than 12 Months | 8 | 56
Fair value, 12 Months or Longer | $ 21,704 | $ 12,195
Gross Unrealized Losses, 12 Months or Longer | $ 989 | $ 847
Number of Securities, 12 Months or Longer | 41 | 22

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