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Federal Income Taxes (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Federal Income Taxes [Abstract]        
Effective tax rate 17.00% 42.00% 16.00% 67.00%
Federal rate 21.00% 21.00% 21.00% 21.00%