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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 428,247  
Due after one year through five years fair value, AFS 3,197,277  
Due after five years through 10 years fair value, AFS 2,463,374  
Due after 10 years fair value, AFS 938,206  
Total AFS fixed income securities, Fair Value 7,027,104 $ 6,612,107
Due in one year or less carrying value, HTM 224  
Due after one year through five years carrying value, HTM 13,833  
Due after five years through 10 years carrying value, HTM 9,183  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 23,240 31,157
Due in one year or less fair value, HTM 223  
Due after one year through five years fair value, HTM 13,179  
Due after five years through 10 years fair value, HTM 8,490  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 21,892 $ 29,837