Investments - Impairments on Available-For-Sale Securities and Agent Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale securities:
Intent to sell	$ (10)	$ (2,274)	$ (195)
Credit recovered (impaired)	67	(707)	0
Total available-for-sale securities	57	(2,981)	(195)
Agent loans - expected credit recoveries (losses)	152	(297)	0
Net impairment recoveries (losses) recognized in earnings	$ 209	$ (3,278)	$ (195)