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Federal Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	34.00%
Income taxes at 34% statutory rate	$ 783	$ 1,247
Interest income on tax exempt municipal securities	(274)	(455)
Earnings on corporate owned life insurance policies	(36)	(61)
Effect of tax credits	(200)	(189)
Other	(11)	(18)
Total effect of nontaxable income	(521)	(723)
Effect of nondeductible expenses	3	8
Federal income tax expense	$ 265	$ 532

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Effective Income Tax Rate Reconciliation, Tax Exempt Income And Tax Credits, Amount

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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