Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 204	$ 289
Collectively evaluated for impairment	4,349	4,537
Total ending allowance balance	4,553	4,826
Loans individually evaluated for impairment	8,822	9,937
Loans collectively evaluated for impairment	660,055	632,434
Total ending loans balance	668,877	642,371
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	110	233
Collectively evaluated for impairment	608	614
Total ending allowance balance	718	847
Loans individually evaluated for impairment	2,935	1,416
Loans collectively evaluated for impairment	93,513	87,522
Total ending loans balance	96,448	88,938
Land Development/Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	965	1,384
Total ending allowance balance	965	1,384
Loans individually evaluated for impairment		515
Loans collectively evaluated for impairment	45,570	44,604
Total ending loans balance	45,570	45,119
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	15	2
Collectively evaluated for impairment	1,597	1,468
Total ending allowance balance	1,612	1,470
Loans individually evaluated for impairment	5,571	7,532
Loans collectively evaluated for impairment	302,839	291,716
Total ending loans balance	308,410	299,248
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,125	941
Total ending allowance balance	1,125	941
Loans individually evaluated for impairment		257
Loans collectively evaluated for impairment	210,504	200,189
Total ending loans balance	210,504	200,446
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	79	54
Collectively evaluated for impairment	54	130
Total ending allowance balance	133	184
Loans individually evaluated for impairment	316	217
Loans collectively evaluated for impairment	7,629	8,403
Total ending loans balance	$ 7,945	$ 8,620

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

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-Name Accounting Standards Codification
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- Definition

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

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

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 and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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