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Allowance For Loan Loss Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	$ 4,943		$ 4,431
Financing Receivable, Collectively Evaluated for Impairment	435,939		428,596
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	22		97
Financing Receivable, Individually Evaluated for Impairment	1,981		2,653
Allowance for loan losses	4,965	$ 4,643	4,528
Loans and Leases Receivable, Gross, Carrying Amount	437,920	431,506	431,249
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	677		506
Financing Receivable, Collectively Evaluated for Impairment	50,974		50,159
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		31
Allowance for loan losses	677		506
Loans and Leases Receivable, Gross, Carrying Amount	50,974	49,850	50,190
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	874		744
Financing Receivable, Collectively Evaluated for Impairment	46,386		49,291
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		55
Allowance for loan losses	874		744
Loans and Leases Receivable, Gross, Carrying Amount	46,386	41,650	49,346
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	2,099		1,995
Financing Receivable, Collectively Evaluated for Impairment	218,882		206,258
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	22		97
Financing Receivable, Individually Evaluated for Impairment	1,981		2,567
Allowance for loan losses	2,121		2,092
Loans and Leases Receivable, Gross, Carrying Amount	220,863	220,439	208,825
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	1,119		1,061
Financing Receivable, Collectively Evaluated for Impairment	110,288		113,763
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		0
Allowance for loan losses	1,119		1,061
Loans and Leases Receivable, Gross, Carrying Amount	110,288	110,855	113,763
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	174		125
Financing Receivable, Collectively Evaluated for Impairment	9,409		9,125
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Individually Evaluated for Impairment	0		0
Allowance for loan losses	174		125
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,409	$ 8,712	$ 9,125

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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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