Separate Account Assets and Liabilities - Reconciliation of the Separate Account Balance in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Separate Account, Liability [Line Items]
Separate account assets	$ 204,366,000	$ 195,906,000	[1]
Variable Annuities
Separate Account, Liability [Line Items]
Separate account assets	203,990,000	195,550,000
Other Product Lines
Separate Account, Liability [Line Items]
Separate account assets	$ 376,000	$ 356,000

[1] (1) Recast for the adoption of ASU 2018-12. See Notes 1 and 2 to the Condensed Consolidated Financial Statements.