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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 537,130  
Due after one year through five years fair value, AFS 3,365,039  
Due after five years through 10 years fair value, AFS 2,109,060  
Due after 10 years fair value, AFS 615,171  
Total AFS fixed income securities, Fair Value 6,626,400 $ 6,455,928
Due in one year or less carrying value, HTM 1,032  
Due after one year through five years carrying value, HTM 14,971  
Due after five years through 10 years carrying value, HTM 10,953  
Due after 10 years carrying value, HTM 0  
Total HTM fixed income securities carrying value 26,956 16,824
Due in one year or less fair value, HTM 1,033  
Due after one year through five years fair value, HTM 15,808  
Due after five years through 10 years fair value, HTM 11,041  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 27,882 $ 18,001