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Investments - AFS Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Expected credit loss on available-for-sale debt securities at beginning of period $ 920 $ 489
Provision for (or reversal of) credit loss expense (354) 431
Expected credit loss on available-for-sale debt securities at end of period 566 920
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 729 371
Provision for (or reversal of) credit loss expense (260) 358
Expected credit loss on available-for-sale debt securities at end of period 469 729
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 2 1
Provision for (or reversal of) credit loss expense 2 1
Expected credit loss on available-for-sale debt securities at end of period 4 2
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 189 117
Provision for (or reversal of) credit loss expense (96) 72
Expected credit loss on available-for-sale debt securities at end of period $ 93 $ 189