Mortgage-Backed Securities - Gross Unrealized Losses (Details)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investments [Line Items]
Allowance for credit loss	$ 0	$ 0
Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	863,130,000	1,051,233,000
Gross Unrealized Losses, Less than 12 Month	$ (81,063,000)	$ (20,118,000)
Number of Securities, Less than 12 Months	75	23
Fair value, 12 Months or Longer	$ 386,087,000	$ 0
Gross Unrealized Losses, 12 Months or Longer	$ (64,837,000)	$ 0
Number of Securities, 12 Months or Longer	8	0
Non-Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 62,025,000	$ 11,667,000
Gross Unrealized Losses, Less than 12 Month	$ (1,573,000)	$ (247,000)
Number of Securities, Less than 12 Months	61	14
Fair value, 12 Months or Longer	$ 5,916,000	$ 1,241,000
Gross Unrealized Losses, 12 Months or Longer	$ (432,000)	$ (97,000)
Number of Securities, 12 Months or Longer	11	6

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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 more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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