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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule of Fixed Income Securities [Line Items]    
Due in one year or less fair value, AFS $ 396,074  
Due after one year through five years fair value, AFS 2,915,421  
Due after five years through 10 years fair value, AFS 2,425,811  
Due after 10 years fair value, AFS 861,516  
Total AFS fixed income securities, Fair Value 6,598,822 $ 6,709,976
Due in one year or less carrying value, HTM 6,727  
Due after one year through five years carrying value, HTM 5,977  
Due after five years through 10 years carrying value, HTM 20,331  
Due after 10 years carrying value, HTM 0  
Fixed income securities, held-to-maturity, net of allowance for credit losses 33,035 28,785
Due in one year or less fair value, HTM 6,899  
Due after one year through five years fair value, HTM 6,012  
Due after five years through 10 years fair value, HTM 19,714  
Due after 10 years fair value, HTM 0  
Total HTM fixed income securities, Fair Value $ 32,625 $ 29,460