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Investments - Rollforward of the Allowance for Credit Losses on Available-for-sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]        
Allowance for credit losses, beginning of period $ 735 $ 154 $ 816  
Additions to the allowance for credit losses on securities for which credit losses were not previously recorded       $ 154
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period   704 (81) 704
Write-offs charged against the allowance, if any $ (735)   $ (735)  
Allowance for credit losses, end of period   $ 858   $ 858