Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 196	$ 289
Collectively evaluated for impairment	4,458	4,537
Total ending allowance balance	4,654	4,826
Loans individually evaluated for impairment	10,453	9,937
Loans collectively evaluated for impairment	655,264	632,434
Total ending loans balance	665,717	642,371
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	86	233
Collectively evaluated for impairment	799	614
Total ending allowance balance	885	847
Loans individually evaluated for impairment	3,823	1,416
Loans collectively evaluated for impairment	92,704	87,522
Total ending loans balance	96,527	88,938
Land Development/Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	959	1,384
Total ending allowance balance	959	1,384
Loans individually evaluated for impairment	505	515
Loans collectively evaluated for impairment	49,075	44,604
Total ending loans balance	49,580	45,119
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	1	2
Collectively evaluated for impairment	1,570	1,468
Total ending allowance balance	1,571	1,470
Loans individually evaluated for impairment	5,439	7,532
Loans collectively evaluated for impairment	302,268	291,716
Total ending loans balance	307,707	299,248
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	1,007	941
Total ending allowance balance	1,007	941
Loans individually evaluated for impairment	252	257
Loans collectively evaluated for impairment	203,137	200,189
Total ending loans balance	203,389	200,446
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	109	54
Collectively evaluated for impairment	123	130
Total ending allowance balance	232	184
Loans individually evaluated for impairment	434	217
Loans collectively evaluated for impairment	8,080	8,403
Total ending loans balance	$ 8,514	$ 8,620

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

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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