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Policyholder Liabilities - Summary of Liability For Future Policy Benefits Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]    
Policy benefit reserves $ 319,895 $ 318,677
Deferred profit liability 19,341 19,084
Liability for future policy benefits and defered profit liability 339,236 337,761
Less: Reinsurance recoverable (1,433) (1,259)
Net liability for future policy benefits, after reinsurance recoverable 337,803 336,502
Gross Premiums or Assessments 3,391 16,994
Interest Expense $ 3,548 $ 14,613
SPIA With Life Contingency    
Liability for Future Policy Benefit, Activity [Line Items]    
Weighted-average liability duration of the liability for future policy benefits (years) 7 years 6 months 29 days 6 years 9 months 10 days
Expected future benefit payments $ 462,201 $ 467,627
Expected future gross premiums $ 0 $ 0