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Investment (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investments [Abstract]    
Balance of credit-related OTTI, Beginning $ 1,841 $ 2,043
Reduction for increases in cash flows expected to be collected (50) (50)
Balance of credit-related OTTI, Ending $ 1,791 $ 1,993