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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 511,751  
Due after one year through five years fair value, AFS 3,389,351  
Due after five years through 10 years fair value, AFS 2,101,275  
Due after 10 years fair value, AFS 674,693  
Total AFS fixed income securities, Fair Value 6,677,070 $ 6,455,928
Due in one year or less carrying value, HTM 32  
Due after one year through five years carrying value, HTM 14,548  
Due after five years through 10 years carrying value, HTM 10,672  
Due after 10 years carrying value, HTM 0  
Total HTM fixed income securities carrying value 25,252 16,824
Due in one year or less fair value, HTM 33  
Due after one year through five years fair value, HTM 15,340  
Due after five years through 10 years fair value, HTM 10,664  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 26,037 $ 18,001