Mortgage-Backed Securities - Realize Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments [Line Items]
Realized gains on sales of MBS - AFS	$ 0	$ 0	$ 7,516
Realized losses on sales of MBS - AFS	0	(13,988)	(811)
Realized losses on sales of MBS - FVO	(74,916)	(75,079)	0
Realized (loss) gains on sales of investments, net	$ (74,916)	$ (89,067)	$ 6,705