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Investments - AFS Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 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 (162) 431
Expected credit loss on available-for-sale debt securities at end of period 758 920
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 (120) 358
Expected credit loss on available-for-sale debt securities at end of period 609 729
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 3 1
Expected credit loss on available-for-sale debt securities at end of period 5 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 (45) 72
Expected credit loss on available-for-sale debt securities at end of period $ 144 $ 189