Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (219,156)	$ 38,809	$ (209,192)
TBAs [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(155,942)	(487,713)	(193,479)
Futures [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(8,973)	514,467	(49,213)
Options on TBAs [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	0	0	(5,683)
Options on Futures [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(779)	(2,224)	0
Interest Rate Swap [Member] | Long [Member] | (Loss) gain on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(53,263)	772,829	92,317
Interest Rate Swap [Member] | Short [Member] | (Loss) gain on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	526	(756,744)	(66,828)
Interest Rate Swaption [Member] | (Loss) gain on interest rate swap, cap and swaption agreements
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(209)	13,414	16,602
Inverse Interest-Only Securities [Member] | (Loss) gain on other derivative instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (516)	$ (15,220)	$ (2,908)