Federal Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Future policy benefits, excess of financial accounting liabilities over tax liabilities	$ 142,476	$ 183,692
Investment securities write-downs for financial accounting purposes	1,088	735
Benefit plan liabilities	8,974	12,546
Accrued operating expenses recorded for financial accounting purposes not currently tax deductible	5,915	4,490
Accrued and unearned investment income recognized for tax purposes and deferred for financial accounting purposes	42	64
Net unrealized losses on debt and equity securities	151,284	0
Goodwill	1,315	1,696
Other	6,637	88
Total gross deferred tax assets	317,731	203,311
Deferred tax liabilities:
Deferred policy acquisition costs, sales inducement costs, and VOBA, principally expensed for tax purposes	(136,092)	(157,543)
Tax reform reserve adjustment	(26,198)	(34,942)
Debt securities, principally due to deferred market discount for tax	(5,895)	(5,611)
Real estate, principally due to adjustments for financial accounting purposes	(30)	(14)
Net unrealized gains on debt and equity securities	0	(66,696)
Foreign currency translation adjustments	(1,464)	(1,356)
Fixed assets, due to different depreciation bases	(11,729)	(13,032)
Cost of reinsurance	(16,449)	(18,834)
Funds withheld liability	(61,198)	(5,591)
Other	(809)	(858)
Total gross deferred tax liabilities	(259,864)	(304,477)
Net deferred tax assets (liabilities)	$ 57,867
Net deferred tax assets (liabilities)		$ (101,166)