Investments in Securities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Debt securities	$ 8,857,881			$ 8,857,881		$ 11,159,754
Realized gain (loss) on sale of available for sale Agency Securities	0	$ 0	$ (7,471)	0	$ (7,471)
To-be-Announced Agency Securities
Debt Securities, Available-for-sale [Line Items]
Derivative assets (liabilities), net	14,644			14,644		1,816
TBA Agency Securities
Debt Securities, Available-for-sale [Line Items]
Trading securities	$ 1,225,038			$ 1,225,038		$ 305,039