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Federal Income Taxes (Components of the consolidated provision for federal income taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Currently payable | $ 972 | $ 1,088 | $ 180
Deferred (benefit) expense | 408 | 275 | 2,836
Income tax expense | $ 1,380 | $ 1,363 | $ 3,016

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