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Impaired Loans Averages (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 2,549	$ 2,099
Impaired Financing Receivable, Interest Income, Accrual Method	3	3
Commercial and Industrial Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	30	10
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Construction And Land Development Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	0	28
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	172	191
Impaired Financing Receivable, Interest Income, Accrual Method	3	3
Commercial Real Estate Other Loans [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,347	1,870
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Commercial Real Estate Loans, Total [Member]
Impaired Financing Receivable, Average Recorded Investment [Line Items]
Impaired Financing Receivable, Average Recorded Investment	2,519	2,061
Impaired Financing Receivable, Interest Income, Accrual Method	$ 3	$ 3

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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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