Derivative Instruments - Summary of Notional Value and Fair Value of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Notional Value	$ 803,456	$ 876,144
Derivative Assets	19,718	12,985
Derivative Liabilities	14,109	17,615
Exchange-traded futures
Derivative [Line Items]
Notional Value	184,317	200,332
Derivative Assets	3,645	832
Derivative Liabilities	97	366
Currency forwards
Derivative [Line Items]
Notional Value	80,275	88,910
Derivative Assets	8,110	5,073
Derivative Liabilities	5,276	6,102
Interest rate swaps
Derivative [Line Items]
Notional Value	5,735	7,185
Derivative Assets	140	181
Derivative Liabilities	10	12
Credit default swaps
Derivative [Line Items]
Notional Value	331,244	371,581
Derivative Assets	683	864
Derivative Liabilities	5,009	10,551
Total return swaps
Derivative [Line Items]
Notional Value	151,692	157,940
Derivative Assets	2,280	1,140
Derivative Liabilities	3,633	419
Option swaps
Derivative [Line Items]
Notional Value	50,193	50,196
Derivative Assets	4,860	4,895
Derivative Liabilities	$ 84	$ 165