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Federal Income Taxes (Components of the consolidated provision for federal income taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Currently payable $ 1,263 $ 972 $ 1,088
Deferred (benefit) expense (276) 408 275
Income tax expense $ 987 $ 1,380 $ 1,363