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Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
AFS, Fair Value    
Due in one year or less fair value, AFS $ 560,606  
Due after one year through five years fair value, AFS 3,627,688  
Due after five years through 10 years fair value, AFS 3,922,594  
Due after 10 years fair value, AFS 1,164,536  
Total AFS fixed income securities, Fair Value 9,275,424 $ 8,127,334
HTM, Carrying Value    
Due in one year or less carrying value, HTM 68  
Due after one year through five years carrying value, HTM 15,840  
Due after five years through 10 years carrying value, HTM 8,335  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 24,243 25,375
HTM, Fair Value    
Due in one year or less fair value, HTM 68  
Due after one year through five years fair value, HTM 15,649  
Due after five years through 10 years fair value, HTM 8,537  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 24,254 $ 24,735