Mortgage-Backed Securities - Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 106,279	$ 346,064
Gross Unrealized Losses, Less than 12 Month	$ 3,310	$ 22,808
Number of Securities, Less than 12 Months	29	79
Fair value, 12 Months or Longer	$ 920,117	$ 697,514
Gross Unrealized Losses, 12 Months or Longer	$ 161,809	$ 156,411
Number of Securities, 12 Months or Longer	64	17
Non-Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 10,660	$ 42,162
Gross Unrealized Losses, Less than 12 Month	$ 318	$ 1,787
Number of Securities, Less than 12 Months	21	56
Fair value, 12 Months or Longer	$ 36,560	$ 12,195
Gross Unrealized Losses, 12 Months or Longer	$ 1,776	$ 847
Number of Securities, 12 Months or Longer	54	22

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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