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Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
AFS, Fair Value    
Due in one year or less fair value, AFS $ 623,583  
Due after one year through five years fair value, AFS 3,638,555  
Due after five years through 10 years fair value, AFS 3,030,532  
Due after 10 years fair value, AFS 795,931  
Total AFS fixed income securities, Fair Value 8,088,601 $ 7,499,197
HTM, Carrying Value    
Due in one year or less carrying value, HTM 820  
Due after one year through five years carrying value, HTM 13,971  
Due after five years through 10 years carrying value, HTM 7,167  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 21,958 22,700
HTM, Fair Value    
Due in one year or less fair value, HTM 833  
Due after one year through five years fair value, HTM 13,574  
Due after five years through 10 years fair value, HTM 7,033  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 21,440 $ 21,923