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Federal Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provision at the expected statutory rate									$ 2,672,000	$ 3,940,000	$ 3,428,000
Effect of tax-exempt income									(704,000)	(668,000)	(1,089,000)
Effect of investment in life insurance									(60,000)	(89,000)	(90,000)
Nondeductible interest									40,000	30,000	41,000
Nondeductible merger and acquisition expense									193,000	191,000
Rate change adjustment										1,169,000
Other items									(12,000)	(73,000)	(13,000)
Provision for income taxes	$ 916,000	$ 548,000	$ 452,000	$ 213,000	$ 2,170,000	$ 871,000	$ 769,000	$ 690,000	$ 2,129,000	$ 4,500,000	$ 2,277,000

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