Loans - Summary of Loans by Credit Quality Indicator (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 377,943	$ 364,341
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	116,898	104,899
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	129,013	119,192
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	111,186	110,412
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,056	23,358
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,790	6,480
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	224,084	212,988
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	99,512	92,123
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	113,780	102,602
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	190	200
Pass [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,602	18,063
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	15,877	14,275
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,220	5,854
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,206	5,671
Special Mention [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,451	2,750
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	16,838	16,393
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,158	6,637
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,639	8,459
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	50	53
Substandard [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	991	1,244
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	121,144	120,685
Not Rated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,008	285
Not Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,388	2,460
Not Rated [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	110,946	110,159
Not Rated [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,012	1,301
Not Rated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 6,790	$ 6,480