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Investments - Costs and Fair Value of Securities Classified as Trading Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Total trading securities, cost $ 9,470 $ 24,769
Fixed Maturities    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Total trading securities, cost 9,470 24,769
Total trading securities, Fair value $ 8,976 $ 24,355