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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, 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

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