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Investments - Schedule of Alternative Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value $ 417,066 $ 440,896
Private equity    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 334,659 346,020
Remaining Commitment 161,065 182,355
Maximum Exposure to Loss 495,724 528,375
Private credit    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 36,928 52,100
Remaining Commitment 134,693 99,185
Maximum Exposure to Loss 171,621 151,285
Real assets    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 45,479 42,776
Remaining Commitment 50,352 38,950
Maximum Exposure to Loss 95,831 81,726
Total alternative investments    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 417,066 440,896
Remaining Commitment 346,110 320,490
Maximum Exposure to Loss $ 763,176 $ 761,386