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Federal Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision at the expected statutory rate									$ 3,940,000	$ 3,428,000	$ 2,779,000
Effect of tax-exempt income									(668,000)	(1,089,000)	(1,105,000)
Effect of investment in life insurance									(89,000)	(90,000)	(91,000)
Nondeductible interest									30,000	41,000	37,000
Nondeductible merger and acquisition expense									191,000		34,000
Rate change adjustment									1,169,000
Other items									(73,000)	(13,000)	(10,000)
Provision for income taxes	$ 2,170,000	$ 871,000	$ 769,000	$ 690,000	$ 638,000	$ 526,000	$ 593,000	$ 520,000	$ 4,500,000	$ 2,277,000	$ 1,644,000

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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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