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Investments in Fixed Maturity Securities (HTM Allowance for Credit Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period $ 38 $ 107 $ 43 $ 114
Cumulative effect adjustment resulting from changes in accounting principles 34 53 34 53
Provision for expected credit losses (4) (54) (9) (61)
Allowance for expected credit losses, end of period $ 34 $ 53 $ 34 $ 53