Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 545	$ 1,514
Collectively evaluated for impairment	4,942	4,775
Total ending allowance balance	5,487	6,289	$ 8,100
Loans individually evaluated for impairment	23,483	37,367
Loans collectively evaluated for impairment	544,028	508,472
Total ending loans balance	567,511	545,839
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	56
Collectively evaluated for impairment	439	504
Total ending allowance balance	495	504
Loans individually evaluated for impairment	2,108	2,583
Loans collectively evaluated for impairment	89,442	71,571
Total ending loans balance	91,550	74,154
Land Development/Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	266	663
Collectively evaluated for impairment	1,615	606
Total ending allowance balance	1,881	1,269
Loans individually evaluated for impairment	9,521	10,964
Loans collectively evaluated for impairment	45,802	39,931
Total ending loans balance	55,323	50,895
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	143	738
Collectively evaluated for impairment	1,469	1,891
Total ending allowance balance	1,612	2,629
Loans individually evaluated for impairment	8,442	18,508
Loans collectively evaluated for impairment	212,677	200,953
Total ending loans balance	221,119	219,461
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	29	51
Collectively evaluated for impairment	1,120	1,342
Total ending allowance balance	1,149	1,393
Loans individually evaluated for impairment	3,208	5,013
Loans collectively evaluated for impairment	177,936	181,878
Total ending loans balance	181,144	186,891
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	51	62
Collectively evaluated for impairment	299	432
Total ending allowance balance	350	494
Loans individually evaluated for impairment	204	299
Loans collectively evaluated for impairment	18,171	14,139
Total ending loans balance	$ 18,375	$ 14,438

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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- Definition

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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- Definition

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)

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-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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-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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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=28367877&loc=d3e4428-111522

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-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

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