Loans - Summary of Loans by Credit Quality Indicator (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 377,174	$ 364,341
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	116,190	104,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	126,423	119,192
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	112,819	110,412
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,904	23,358
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,838	6,480
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	223,755	212,988
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	100,746	92,123
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	111,168	102,602
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	243	200
Pass [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	11,598	18,063
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	17,403	14,275
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,850	5,854
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,553	5,671
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Special Mention [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		2,750
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	13,137	16,393
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,170	6,637
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,879	8,459
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	48	53
Substandard [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,040	1,244
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Doubtful [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Doubtful [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Doubtful [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans
Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	122,879	120,685
Not Rated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	424	285
Not Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,823	2,460
Not Rated [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	112,528	110,159
Not Rated [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,266	1,301
Not Rated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 6,838	$ 6,480