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ORGANIZATION - Narrative (Details)
$ in Thousands
3 Months Ended
Oct. 03, 2022
USD ($)
Mar. 31, 2023
USD ($)
principalSubsidiary
Dec. 31, 2022
USD ($)
Entity Information [Line Items]      
Number of principal subsidiaries | principalSubsidiary   2  
Assets   $ 234,826,000 $ 227,416,000
Corporate Solutions Life Reinsurance Company (CS Life) | Alliance Bernstein      
Entity Information [Line Items]      
Assets $ 2,800,000    
Direct insurance liabilities ceded 4,100,000    
Separate account, liability, ceded 5,300,000    
Corporate Solutions Life Reinsurance Company (CS Life) | Alliance Bernstein | Guaranteed Minimum Withdrawal Benefit      
Entity Information [Line Items]      
Fair value 1,200,000    
Massachusetts Domiciled Insurance Company      
Entity Information [Line Items]      
Guaranteed credit amount of general account assets 4,000,000    
Reinsurance, guaranteed credit amount of separate account assets $ 5,000,000    
Guaranteed credit rate (as a percent) 3.00%    
Number of Employees, Total | Reinsurance Transaction      
Entity Information [Line Items]      
Deferred variable annuity $ 360    
Number of Employees, Total | Reinsurance Transaction | Global Atlantic Transaction      
Entity Information [Line Items]      
Concentration risk (as a percent) 50.00%