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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Currently payable $ 1,088 $ 180 $ 2,630
Deferred (benefit) expense 275 2,836 (282)
Income tax expense $ 1,363 $ 3,016 $ 2,348