Derivatives - Gain (loss) on Derivative Instruments , Net (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative [Line Items]
(Loss) gain on derivative instruments, net	$ (10,694)	$ (154,064)	$ (186,875)	$ 11,707
Short position \| U.S. Treasury futures
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(20,423)	(216,189)	(58,451)	(12,169)
Short position \| Interest rate swaps
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(16,055)	(10,066)	(204,985)	(10,155)
Long position \| Interest Rate Swaption
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(1,279)	0	(286)	0
Long position \| TBA securities
Derivative [Line Items]
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	27,571	72,191	77,355	34,031
Long position \| Exchange Traded Options
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ (508)	$ 0	$ (508)	$ 0

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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