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INVESTMENTS - AFS Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Expected credit loss on available-for-sale debt securities at beginning of period $ 566 $ 920
Provision for (or reversal of) credit loss expense 452 (354)
Expected credit loss on available-for-sale debt securities at end of period 1,018 566
Corporate Bonds    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Expected credit loss on available-for-sale debt securities at beginning of period 469 729
Provision for (or reversal of) credit loss expense 425 (260)
Expected credit loss on available-for-sale debt securities at end of period 894 469
Municipal Bonds    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Expected credit loss on available-for-sale debt securities at beginning of period 4 2
Provision for (or reversal of) credit loss expense (1) 2
Expected credit loss on available-for-sale debt securities at end of period 3 4
Redeemable preferred stock    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Expected credit loss on available-for-sale debt securities at beginning of period 93 189
Provision for (or reversal of) credit loss expense 28 (96)
Expected credit loss on available-for-sale debt securities at end of period $ 121 $ 93