Mortgage-Backed Securities - Gains and Losses from Sales of Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Net realized gain (loss)	$ (21,758)	$ 0	$ (27,022)	$ 0
Agency MBS portfolio
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales:	113,172	0	280,848	0
Gross realized gains:	0	0	0	0
Gross realized losses:	$ (21,758)	$ 0	$ (27,022)	$ 0