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Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
AFS, Fair Value    
Due in once year or less fair value, AFS $ 593,487  
Due after one year through five years fair value, AFS 3,556,760  
Due after five years through 10 years fair value, AFS 3,024,602  
Due after 10 years fair value, AFS 952,485  
Total AFS Fixed income securities, Fair Value 8,127,334 $ 7,499,197
HTM, Carrying Value    
Due in one year or less carrying value, HTM 1,152  
Due after one year through five years carrying value, HTM 15,767  
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 25,375 22,700
HTM, Fair Value    
Due in one year or less fair value, HTM 1,176  
Due after one year through five years fair value, HTM 15,461  
Due after five years through 10 years fair value, HTM 8,098  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities fair value $ 24,735 $ 21,923