Mortgage-Backed Securities - Realize Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments [Line Items]
Realized losses on sales of MBS - AFS	$ 0	$ (14,025)	$ 0	$ (14,025)
Realized losses on sales of MBS - FVO	0	(56,942)	(74,916)	(75,492)
Realized loss on sales of investments, net	$ 0	$ (70,967)	$ (74,916)	$ (89,517)