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Investments in Fixed Maturity Securities (HTM Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Balance, beginning of period $ 14 $ 34 $ 25 $ 43
Cumulative effect adjustment resulting from changes in accounting principles 11 30 11 30
Provision for expected credit losses (3) (4) (14) (13)
Balance, end of period $ 11 $ 30 $ 11 $ 30