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Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
AFS, Fair Value    
Due in one year or less fair value, AFS $ 580,543  
Due after one year through five years fair value, AFS 3,561,447  
Due after five years through 10 years fair value, AFS 3,398,781  
Due after 10 years fair value, AFS 1,064,404  
Total AFS fixed income securities, Fair Value 8,605,175 $ 8,127,334
HTM, Carrying Value    
Due in one year or less carrying value, HTM 661  
Due after one year through five years carrying value, HTM 16,193  
Due after five years through 10 years carrying value, HTM 8,456  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 25,310 25,375
HTM, Fair Value    
Due in one year or less fair value, HTM 660  
Due after one year through five years fair value, HTM 15,758  
Due after five years through 10 years fair value, HTM 8,382  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 24,800 $ 24,735