Mortgage-Backed Securities - Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 346,064	$ 1,051,233
Gross Unrealized Losses, Less than 12 Month	$ 22,808	$ 20,118
Number of Securities, Less than 12 Months	79	23
Fair value, 12 Months or Longer	$ 697,514	$ 0
Gross Unrealized Losses, 12 Months or Longer	$ 156,411	$ 0
Number of Securities, 12 Months or Longer	17	0
Non-Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 42,162	$ 11,667
Gross Unrealized Losses, Less than 12 Month	$ 1,787	$ 247
Number of Securities, Less than 12 Months	56	14
Fair value, 12 Months or Longer	$ 12,195	$ 1,241
Gross Unrealized Losses, 12 Months or Longer	$ 847	$ 97
Number of Securities, 12 Months or Longer	22	6

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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