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Investments - AFS Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Expected credit loss on available-for-sale debt securities at beginning of period $ 489 $ 186
Provision for (or reversal of) credit loss expense 83 303
Expected credit loss on available-for-sale debt securities at end of period 572 489
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 371 148
Provision for (or reversal of) credit loss expense 85 223
Expected credit loss on available-for-sale debt securities at end of period 456 371
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 1 0
Provision for (or reversal of) credit loss expense (1) 1
Expected credit loss on available-for-sale debt securities at end of period 0 1
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 117 38
Provision for (or reversal of) credit loss expense (1) 79
Expected credit loss on available-for-sale debt securities at end of period $ 116 $ 117