Separate Accounts - Schedule of Fair Value of Separate Accounts by Major Category of Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account assets	$ 2,329,968	$ 2,305,717
Fixed Income Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account assets	850,880	796,384
Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account assets	1,358,331	1,340,541
Cash And Cash Equivalents [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account assets	130,713	181,162
Due To From Funds Netting Arrangement [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account assets	(9,983)	(12,399)
Other Long-Term Investments [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Separate account assets	$ 27	$ 29