Impaired Loans Averages (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 1,567	$ 2,024	$ 2,014	$ 2,061
Impaired Financing Receivable, Interest Income, Accrual Method	2	2	5	5
Commercial and Industrial Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	7	2	17	6
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Construction And Land Development Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment		15		21
Impaired Financing Receivable, Interest Income, Accrual Method		0		0
Commercial Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	168	186	170	189
Impaired Financing Receivable, Interest Income, Accrual Method	2	2	5	5
Commercial Real Estate Other Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1,392	1,821	1,827	1,845
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Commercial Real Estate Loans, Total [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	1,560	2,007	1,997	2,034
Impaired Financing Receivable, Interest Income, Accrual Method	$ 2	$ 2	$ 5	$ 5