Allowance for Loan Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	$ 4,732	$ 4,588	$ 4,757	$ 4,643
Financing Receivable, Allowance for Credit Losses, Charge-offs	(39)	(5)	(97)	(84)
Financing Receivable, Allowance for Credit Losses, Recoveries	57	282	90	306
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	18	277	(7)	222
Provision for loan losses	0	100	0	100
Financing Receivable, Allowance for Credit Losses	4,750	4,965	4,750	4,965
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	724	524	653	540
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0	(52)	0
Financing Receivable, Allowance for Credit Losses, Recoveries	32	4	46	6
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	32	4	(6)	6
Provision for loan losses	(156)	149	(47)	131
Financing Receivable, Allowance for Credit Losses	600	677	600	677
Construction And Land Development Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	670	845	734	812
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	209	0	214
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	0	209	0	214
Provision for loan losses	117	(180)	53	(152)
Financing Receivable, Allowance for Credit Losses	787	874	787	874
Commercial Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	2,119	2,004	2,126	2,071
Financing Receivable, Allowance for Credit Losses, Charge-offs	(39)	0	(39)	0
Financing Receivable, Allowance for Credit Losses, Recoveries	0	0	0	0
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	(39)	0	(39)	0
Provision for loan losses	117	117	110	50
Financing Receivable, Allowance for Credit Losses	2,197	2,121	2,197	2,121
Residential Real Estate Loans, Total [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	1,053	1,064	1,071	1,107
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	0	(4)	(78)
Financing Receivable, Allowance for Credit Losses, Recoveries	17	63	33	77
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	17	63	29	(1)
Provision for loan losses	(53)	(8)	(83)	13
Financing Receivable, Allowance for Credit Losses	1,017	1,119	1,017	1,119
Consumer Installment and Revolving Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	166	151	173	113
Financing Receivable, Allowance for Credit Losses, Charge-offs	0	(5)	(2)	(6)
Financing Receivable, Allowance for Credit Losses, Recoveries	8	6	11	9
Financing Receivable Allowance For Credit Losses Net Chargeoffs Recoveries	8	1	9	3
Provision for loan losses	(25)	22	(33)	58
Financing Receivable, Allowance for Credit Losses	$ 149	$ 174	$ 149	$ 174