Mortgage-Backed Securities - Realize Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments [Line Items]
Trading Securities, Realized Gain	$ 0	$ 0	$ 0	$ 0
Debt Securities, Trading, Realized Loss	(51,601)	(18,550)	(74,916)	(18,550)
Realized loss on sales of investments, net	(51,601)	(18,550)	(74,916)	(18,550)
Debt Securities, Available-for-sale, Realized Gain (Loss)	0	0	0	0
Debt Securities, Available-for-sale, Realized Loss	$ 0	$ 0	$ 0	$ 0