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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period $ 378 $ 730 $ 387 $ 798
Cumulative effect adjustment resulting from changes in accounting principles 127 453 127 453
Provision for expected credit losses (251) (277) (260) (345)
Allowance for expected credit losses, end of period $ 127 $ 453 $ 127 $ 453