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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 330,440  
Due after one year through five years fair value, AFS 2,794,530  
Due after five years through 10 years fair value, AFS 2,450,184  
Due after 10 years fair value, AFS 864,124  
Total AFS fixed income securities, Fair Value 6,439,278 $ 6,709,976
Due in one year or less carrying value, HTM 6,721  
Due after one year through five years carrying value, HTM 5,252  
Due after five years through 10 years carrying value, HTM 20,121  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 32,094 28,785
Due in one year or less fair value, HTM 6,817  
Due after one year through five years fair value, HTM 5,218  
Due after five years through 10 years fair value, HTM 19,270  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 31,305 $ 29,460