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Investments - Additional Information (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
USD ($)
security
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Investment Holdings [Line Items]      
Accrued investment income | $ $ 18,465   $ 17,505
Fixed Income Securities      
Investment Holdings [Line Items]      
Accrued investment income | $ $ 17,500   16,400
Number of debt securities for which there is an allowance for credit losses | security 14    
Number of debt securities in an unrealized loss position for which an allowance for credit losses has not been recorded | security 1,341    
Unrealized loss | $ $ 202,650   $ 16,891
Unrealized losses as percentage of fixed income portfolio cost basis 8.20%    
Unrealized losses relative to total invested assets (as a percent) 6.90%    
Number of unrealized loss positions | security 1,341    
Number of securities in unrealized loss positions for 12 months or longer | security 133    
Losses on fixed income securities | $ $ 100 $ 0