Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total	$ 357,093	$ 383,594	$ 392,440
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34,060	43,524
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	141,961	134,964
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	145,968	174,220
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	22,803	23,071
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,301	7,815
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	302,285	304,351
Pass [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,724	22,384
Pass [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	130,048	120,692
Pass [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	118,663	134,701
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	21,563	18,831
Pass [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,287	7,743
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,660	26,614
Special Mention [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,500	5,176
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,378	6,055
Special Mention [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,227	14,513
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	555	798
Special Mention [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total		72
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	35,148	52,629
Substandard [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,836	15,964
Substandard [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,535	8,217
Substandard [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	17,078	25,006
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	685	3,442
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