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Policyholder Liabilities - Schedule of Present Value of Expected Future Policy Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]      
Beginning balance, liability for future policy benefit $ 317,418 $ 401,022  
Beginning balance at original discount rate 341,071 351,575  
Adjustment to opening retained earnings for expected future policy benefits   0 $ 1,280
Effect of actual variances from expected experience   (354) (1,958)
Adjusted beginning of year balance   340,717 $ 350,897
Issuances 2,874 15,766  
Interest accrual 3,548 14,613  
Benefit payments 0 0  
Derecognition (lapses) (9,818) (40,205)  
Ending balance at original discount rate 337,321 341,071  
Effect of changes in discount rate assumptions (18,859) (23,653)  
Ending balance, liability for future policy benefit $ 318,462 $ 317,418