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Allowance For Loan Loss Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	$ 4,621		$ 4,542
Financing Receivable, Collectively Evaluated for Impairment	447,259		425,956
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	49		36
Financing Receivable, Individually Evaluated for Impairment	2,713		1,786
Allowance for loan losses	4,670	$ 4,643	4,578
Loans and Leases Receivable, Gross, Carrying Amount	449,972	431,506	427,742
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	471		515
Financing Receivable, Collectively Evaluated for Impairment	50,068		50,858
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	33		0
Financing Receivable, Individually Evaluated for Impairment	33		23
Allowance for loan losses	504		515
Loans and Leases Receivable, Gross, Carrying Amount	50,101	49,850	50,881
Construction And Land Development Loans [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	851		673
Financing Receivable, Collectively Evaluated for Impairment	47,455		43,959
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		45
Allowance for loan losses	851		673
Loans and Leases Receivable, Gross, Carrying Amount	47,455	41,650	44,004
Commercial Real Estate Loans, Total [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,045		2,196
Financing Receivable, Collectively Evaluated for Impairment	229,700		209,840
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	16		36
Financing Receivable, Individually Evaluated for Impairment	2,680		1,718
Allowance for loan losses	2,061		2,232
Loans and Leases Receivable, Gross, Carrying Amount	232,380	220,439	211,558
Residential Real Estate Loans, Total [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,077		1,020
Financing Receivable, Collectively Evaluated for Impairment	110,159		112,303
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		0
Allowance for loan losses	1,077		1,020
Loans and Leases Receivable, Gross, Carrying Amount	110,159	110,855	112,303
Consumer Installment and Revolving Loans [Member]
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	177		138
Financing Receivable, Collectively Evaluated for Impairment	9,877		8,996
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		0
Allowance for loan losses	177		138
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,877	$ 8,712	$ 8,996

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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