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Allowance For Loan Loss Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Loss Additional Information [Line Items]
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	$ 4,715	$ 4,612
Financing Receivable, Collectively Evaluated for Impairment	451,435	429,376
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	42	31
Financing Receivable, Individually Evaluated for Impairment	2,742	2,130
Allowance for loan losses	4,757	4,643
Loans and Leases Receivable, Gross, Carrying Amount	454,177	431,506
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	622	540
Financing Receivable, Collectively Evaluated for Impairment	59,055	49,835
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	31	0
Financing Receivable, Individually Evaluated for Impairment	31	15
Allowance for loan losses	653	540
Loans and Leases Receivable, Gross, Carrying Amount	59,086	49,850
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	734	812
Financing Receivable, Collectively Evaluated for Impairment	39,607	41,618
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Financing Receivable, Individually Evaluated for Impairment	0	32
Allowance for loan losses	734	812
Loans and Leases Receivable, Gross, Carrying Amount	39,607	41,650
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	2,115	2,040
Financing Receivable, Collectively Evaluated for Impairment	236,322	218,356
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	11	31
Financing Receivable, Individually Evaluated for Impairment	2,711	2,083
Allowance for loan losses	2,126	2,071
Loans and Leases Receivable, Gross, Carrying Amount	239,033	220,439
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	1,071	1,107
Financing Receivable, Collectively Evaluated for Impairment	106,863	110,855
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Financing Receivable, Individually Evaluated for Impairment	0	0
Allowance for loan losses	1,071	1,107
Loans and Leases Receivable, Gross, Carrying Amount	106,863	110,855
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	173	113
Financing Receivable, Collectively Evaluated for Impairment	9,588	8,712
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Financing Receivable, Individually Evaluated for Impairment	0	0
Allowance for loan losses	173	113
Loans and Leases Receivable, Gross, Carrying Amount	$ 9,588	$ 8,712

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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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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-Publisher FASB
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-Topic 310
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
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-Paragraph 11B
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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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