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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 348,132  
Due after one year through five years fair value, AFS 3,062,605  
Due after five years through 10 years fair value, AFS 2,814,604  
Due after 10 years fair value, AFS 739,175  
Total AFS fixed income securities, Fair Value 6,964,516 $ 6,612,107
Due in one year or less carrying value, HTM 658  
Due after one year through five years carrying value, HTM 14,597  
Due after five years through 10 years carrying value, HTM 9,395  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 24,650 31,157
Due in one year or less fair value, HTM 657  
Due after one year through five years fair value, HTM 13,944  
Due after five years through 10 years fair value, HTM 8,921  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 23,522 $ 29,837