Investments in Fixed Maturity Securities (HTM Allowance for Credit Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Allowance for expected credit losses, beginning of period	$ 127	$ 453	$ 387	$ 798
Cumulative effect adjustment resulting from changes in accounting principles	121	396	121	396
Provision for expected credit losses	(6)	(57)	(266)	(402)
Allowance for expected credit losses, end of period	$ 121	$ 396	$ 121	$ 396