Mortgage-Backed Securities - Gross Unrealized Losses (Details) $ in Thousands	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 63,933	$ 346,064
Gross Unrealized Losses, Less than 12 Month	$ 3,117	$ 22,808
Number of Securities, Less than 12 Months	24	79
Fair value, 12 Months or Longer	$ 918,195	$ 697,514
Gross Unrealized Losses, 12 Months or Longer	$ 171,896	$ 156,411
Number of Securities, 12 Months or Longer	65	17
Non-Agency MBS
Investments [Line Items]
Fair value, Less than 12 Months	$ 6,172	$ 42,162
Gross Unrealized Losses, Less than 12 Month	$ 208	$ 1,787
Number of Securities, Less than 12 Months	15	56
Fair value, 12 Months or Longer	$ 31,780	$ 12,195
Gross Unrealized Losses, 12 Months or Longer	$ 1,677	$ 847
Number of Securities, 12 Months or Longer	55	22