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Investments - Rollforward of Cumulative Credit Losses on Fixed Maturities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Beginning balance of credit losses on fixed maturities $ 837 $ 833
Additional credit losses for OTTI 103 4
Reduction of credit losses related to securities sold during period (16)  
Ending balance of credit losses on fixed maturities $ 924 $ 837