Policyholder Liabilities (Summary of Liability For Future Policy Benefits Activity) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Policy benefit reserves	$ 293,943	$ 303,200
Deferred profit liability	22,281	22,455
Liability for future policy benefits included in policy benefit reserves	316,224	325,655
Less: Reinsurance recoverable	(2,615)	(2,496)
Net liability for future policy benefits, after reinsurance recoverable	$ 313,609	$ 323,159
Interest accretion rate	4.26%	4.26%
Current discount rate	5.23%	5.00%
SPIA With Life Contingency
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average liability duration of the liability for future policy benefits (years)	7 years 1 month 24 days	6 years 6 months 21 days
Expected future benefit payments	$ 410,285	$ 447,669
Expected future gross premiums	0	0
Gross premiums or assessments	764	7,608
Interest expense	$ 3,271	$ 13,626