Reinsurance and Catastrophes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Losses incurred for catastrophe claims, carrying amount	$ 80,000	$ 78,200	$ 84,400
Reinsurance balances receivable	$ 462,500	$ 119,600
Percentage of coverage for catastrophe losses above retention amount, layer one	95.00%
Coverage above retention per occurrence under layer one catastrophe reinsurance	$ 25,000
Retention base amount per occurrence under layer one	25,000
Coverage above retention per occurrence under layer two catastrophe reinsurance	40,000
Retention base amount per occurrence under layer two	50,000
Coverage above retention per occurrence under layer three catastrophe reinsurance	85,000
Retention base amount per occurrence under layer three	90,000
Reinsured amount of each loss above retention in clash event	20,000
Amount of maximum individual life insurance risk retained	$ 500
Percentage of life reinsured catastrophe risk in excess specified retention per occurrence amount	100.00%
Other accidental death and dismemberment risk, ceded, percent	100.00%
Employer sponsored products, gross assumed group disability and specialty health benefits retained, percent	72.60%
Individual life and annuity benefits, ceded, percent	100.00%
National Guardian Life Insurance Company NGL
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Reinsurance balances receivable	$ 214,100
Reinsurance recoverable as a percentage of shareholders' equity, in excess	10.00%
Minimum
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Retention amount per occurrence related to catastrophe losses, layer one	$ 25,000
Liability coverages, Company reinsured each loss above a retention per occurrence	5,000
Amount of group life policy insurance risk retained	100
Amount life catastrophe risk retention per occurrence	1,000
Maximum
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items]
Retention amount per occurrence related to catastrophe losses, layer one	175,000
Amount of group life policy insurance risk retained	125
Amount life catastrophe risk retention per occurrence	$ 35,000