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Federal Income Taxes (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Federal Income Taxes [Abstract]        
Effective tax rate 14.00% 13.00% 15.00% (7.00%)
Federal rate 21.00% 21.00% 21.00% 21.00%