Loans - Summary of Loans by Credit Quality Indicator (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 409,580	$ 378,882
Construction & land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	12,855	13,444
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	126,843	117,478
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	141,417	129,828
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	120,739	111,445
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,726	6,687
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	254,464	226,167
Pass [Member] | Construction & land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,895	9,470
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	113,425	101,195
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	131,925	115,265
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	219	237
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	11,777	20,015
Special Mention [Member] | Construction & land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,976	587
Special Mention [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,545	10,352
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,256	9,076
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	11,541	11,038
Substandard [Member] | Construction & land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans		1,884
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,770	5,066
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,730	4,041
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	41	47
Not Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	131,798	121,662
Not Rated [Member] | Construction & land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,984	1,503
Not Rated [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,103	865
Not Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	506	1,446
Not Rated [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	120,479	111,161
Not Rated [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 7,726	$ 6,687