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Investments - AFS Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 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 150 (354)
Expected credit loss on available-for-sale debt securities at end of period 716 566
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 148 (260)
Expected credit loss on available-for-sale debt securities at end of period 617 469
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 0 2
Expected credit loss on available-for-sale debt securities at end of period 4 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 2 (96)
Expected credit loss on available-for-sale debt securities at end of period $ 95 $ 93