Derivatives - Gain (loss) on Derivative Instruments , Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Gain (loss) on derivative instruments, net	$ 436,007	$ 81,417	$ (172,290)
Interest rate swaps
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments			(182,942)
Interest rate swaptions
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	47,738	40,330	680
Options on U.S. Treasury futures
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(431)	(2,141)	(26,186)
Short position | U.S. Treasury futures
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	724,347	61,215	(15,046)
Short position | TBA securities
Derivative [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net			(10,041)
Long position | TBA securities
Derivative [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	$ (335,647)	$ (17,987)	$ 61,245