Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total	$ 359,533	$ 357,093	$ 382,339
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	33,876	34,060
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	147,541	141,961
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	142,719	145,968
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23,381	22,803
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,016	12,301
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	305,352	302,285
Pass [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	20,371	19,724
Pass [Member] \| Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	135,686	130,048
Pass [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	114,659	118,663
Pass [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	22,620	21,563
Pass [Member] \| Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,016	12,287
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	20,606	19,660
Special Mention [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,620	3,500
Special Mention [Member] \| Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,393	5,378
Special Mention [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,367	10,227
Special Mention [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	226	555
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	33,575	35,148
Substandard [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,885	10,836
Substandard [Member] \| Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,462	6,535
Substandard [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,693	17,078
Substandard [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	535	685
Substandard [Member] \| Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		14
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total
Doubtful [Member] \| Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total