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FAIR VALUE MEASUREMENTS - Financial Instruments Disclosed, But Not Carried, at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Fixed maturities, held to maturity, amortized cost $ 693,042 $ 686,296
Fixed maturities, held to maturity, fair value 683,726 675,851
Federal Home Loan Bank advances 85,790 85,790
Federal Home Loan Bank advances, fair value 86,000 86,000
Reported value measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Notes payable 1,314,000 1,314,000
Estimate of fair value measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Notes payable $ 1,204,000 $ 1,198,000