Loans and the Allowance for Loan Losses, Activity In Period (Details) $ in Thousands		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2018 USD ($)		Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Period		Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Period		Sep. 30, 2018 USD ($) qtr		Dec. 31, 2017 USD ($)
Allowance for loan losses by segment [Roll Forward]
Beginning Balance					$ 9,448		$ 8,245	$ 8,245
Charges-offs					(1,579)			(3,287)
Recoveries					513			330
Provision for loan losses		$ 749		$ 1,275	1,849		2,925	4,160
Ending balance		10,231			10,231			9,448
Ending balances individually evaluated for impairment										$ 229		$ 95
Ending balances collectively evaluated for impairment										10,002		9,353
Ending balance acquired impaired loans										0
Ending balance		10,231			$ 9,448		8,245	$ 9,448		10,231		9,448
Loan Balances [Abstract]
Ending balance individually evaluated for impairment										17,191		18,475
Ending balance collectively evaluated for impairment										761,796		720,065
Ending balance acquired impaired loans										448
Ending balance	[1]									$ 779,435		738,540
Changes in Accounting Methodology [Abstract]
Number of migration periods | Period					8			8
Number of quarters remains on each migration period | qtr										12
Commercial [Member]
Allowance for loan losses by segment [Roll Forward]
Beginning Balance					$ 1,889		1,493	$ 1,493
Charges-offs					(81)			(807)
Recoveries					136			37
Provision for loan losses					405			1,166
Ending balance		2,349			2,349			1,889
Ending balances individually evaluated for impairment										$ 14		0
Ending balances collectively evaluated for impairment										2,335		1,889
Ending balance acquired impaired loans										0
Ending balance		2,349			1,889		1,493	1,889		2,349		1,889
Loan Balances [Abstract]
Ending balance individually evaluated for impairment										308		836
Ending balance collectively evaluated for impairment										67,363		59,562
Ending balance acquired impaired loans										101
Ending balance										67,772		60,398
Real Estate [Member]
Loan Balances [Abstract]
Ending balance acquired impaired loans										448
Ending balance										530,053		492,720
Real Estate [Member] | Construction [Member]
Allowance for loan losses by segment [Roll Forward]
Beginning Balance					541		846	846
Charges-offs					0			0
Recoveries					0			104
Provision for loan losses					(401)			(409)
Ending balance		140			140			541
Ending balances individually evaluated for impairment										19		18
Ending balances collectively evaluated for impairment										121		523
Ending balance acquired impaired loans										0
Ending balance		140			541		846	541		140		541
Loan Balances [Abstract]
Ending balance individually evaluated for impairment										511		813
Ending balance collectively evaluated for impairment										32,387		26,676
Ending balance acquired impaired loans										0
Ending balance										32,898		27,489
Real Estate [Member] | Mortgage [Member]
Allowance for loan losses by segment [Roll Forward]
Beginning Balance	[2]				5,217		5,267	5,267
Charges-offs	[2]				(729)			(1,934)
Recoveries	[2]				127			45
Provision for loan losses	[2]				1,336			1,839
Ending balance	[2]	5,951			5,951			5,217
Ending balances individually evaluated for impairment	[2]									196		77
Ending balances collectively evaluated for impairment	[2]									5,755		5,140
Ending balance acquired impaired loans	[2]									0
Ending balance	[2]	5,951			5,217		5,267	5,217		5,951		5,217
Loan Balances [Abstract]
Ending balance individually evaluated for impairment	[2]									16,372		16,826
Ending balance collectively evaluated for impairment	[2]									480,436		448,405
Ending balance acquired impaired loans	[2]									347
Ending balance	[2]									497,155		465,231
Consumer [Member]
Allowance for loan losses by segment [Roll Forward]
Beginning Balance					1,644	[3]	455	455
Charges-offs					(502)	[3]		(279)
Recoveries					189	[3]		56
Provision for loan losses					214	[3]		1,412
Ending balance	[3]	1,545			1,545			1,644
Ending balances individually evaluated for impairment										0	[3]	0
Ending balances collectively evaluated for impairment										1,545	[3]	1,644
Ending balance acquired impaired loans	[3]									0
Ending balance		1,545	[3]		1,644	[3]	455	1,644	[3]	1,545	[3]	1,644	[3]
Loan Balances [Abstract]
Ending balance individually evaluated for impairment										0	[3]	0
Ending balance collectively evaluated for impairment										170,898	[3]	174,225
Ending balance acquired impaired loans	[3]									0
Ending balance										170,898	[3]	174,225
Other [Member]
Allowance for loan losses by segment [Roll Forward]
Beginning Balance					157		184	184
Charges-offs					(267)			(267)
Recoveries					61			88
Provision for loan losses					295			152
Ending balance		246			246			157
Ending balances individually evaluated for impairment										0		0
Ending balances collectively evaluated for impairment										246		157
Ending balance acquired impaired loans										0
Ending balance		$ 246			$ 157		$ 184	$ 184		246		157
Loan Balances [Abstract]
Ending balance individually evaluated for impairment										0		0
Ending balance collectively evaluated for impairment										10,712		11,197
Ending balance acquired impaired loans										0
Ending balance										$ 10,712		$ 11,197

[1] Net deferred loan fees totaled $849 thousand and $916 thousand at September 30, 2018 and December 31, 2017, respectively.

[2] The real estate-mortgage segment includes residential 1 - 4 family, commercial real estate, second mortgages and equity lines of credit.

[3] The consumer segment includes consumer automobile loans.