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Impaired Loans Averages (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 2,341	$ 2,511
Impaired Financing Receivable, Interest Income, Accrual Method	11	33
Commercial and Industrial Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	50	31
Impaired Financing Receivable, Interest Income, Accrual Method	0	2
Construction And Land Development Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	11	94
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	184	699
Impaired Financing Receivable, Interest Income, Accrual Method	10	31
Commercial Real Estate Other Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,096	1,687
Impaired Financing Receivable, Interest Income, Accrual Method	1	0
Commercial Real Estate Loans, Total [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,280	2,386
Impaired Financing Receivable, Interest Income, Accrual Method	$ 11	$ 31

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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