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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 369,240  
Due after one year through five years fair value, AFS 3,056,529  
Due after five years through 10 years fair value, AFS 2,912,169  
Due after 10 years fair value, AFS 694,410  
Total AFS fixed income securities, Fair Value 7,032,348 $ 6,612,107
Due in one year or less carrying value, HTM 443  
Due after one year through five years carrying value, HTM 13,942  
Due after five years through 10 years carrying value, HTM 9,291  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 23,676 31,157
Due in one year or less fair value, HTM 442  
Due after one year through five years fair value, HTM 13,233  
Due after five years through 10 years fair value, HTM 8,681  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 22,356 $ 29,837