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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 428,247 |
Due after one year through five years fair value, AFS | 3,197,277 |
Due after five years through 10 years fair value, AFS | 2,463,374 |
Due after 10 years fair value, AFS | 938,206 |
Total AFS fixed income securities, Fair Value | 7,027,104 | $ 6,612,107
Due in one year or less carrying value, HTM | 224 |
Due after one year through five years carrying value, HTM | 13,833 |
Due after five years through 10 years carrying value, HTM | 9,183 |
Due after 10 years carrying value, HTM | 0 |
Fixed income securities, held-to-maturity, net of allowance for credit losses | 23,240 | 31,157
Due in one year or less fair value, HTM | 223 |
Due after one year through five years fair value, HTM | 13,179 |
Due after five years through 10 years fair value, HTM | 8,490 |
Due after 10 years fair value, HTM | 0 |
Total HTM fixed income securities, Fair Value | $ 21,892 | $ 29,837

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