Derivatives - Schedule of Futures and Options (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative assets	$ 8,386,000	$ 54,361,000
Derivative liabilities	1,314,000	0
U.S. Treasury futures
Derivative [Line Items]
Derivative liabilities	54,400,000	$ 219,900,000
Put options on U.S. Treasury futures | Short position
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, at Carrying Value	$ 0