Allowance for Loan Losses - Internal Risk Rating Grades (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
INTERNAL RISK RATING GRADES
Loan Receivables	$ 105,608,000	$ 105,842,000
Pass
INTERNAL RISK RATING GRADES
Loan Receivables	81,104,000	80,254,000
Watch
INTERNAL RISK RATING GRADES
Loan Receivables	15,301,000	18,869,000
Special Mention
INTERNAL RISK RATING GRADES
Loan Receivables	5,502,000	2,904,000
Substandard
INTERNAL RISK RATING GRADES
Loan Receivables	3,701,000	3,815,000
Construction, Land and Land Development
INTERNAL RISK RATING GRADES
Loan Receivables	33,805,000	31,839,000
Construction, Land and Land Development | Pass
INTERNAL RISK RATING GRADES
Loan Receivables	27,624,000	25,616,000
Construction, Land and Land Development | Watch
INTERNAL RISK RATING GRADES
Loan Receivables	3,465,000	3,493,000
Construction, Land and Land Development | Special Mention
INTERNAL RISK RATING GRADES
Loan Receivables	1,410,000	1,416,000
Construction, Land and Land Development | Substandard
INTERNAL RISK RATING GRADES
Loan Receivables	1,306,000	1,314,000
Farmland
INTERNAL RISK RATING GRADES
Loan Receivables	1,174,000	1,262,000
Farmland | Pass
INTERNAL RISK RATING GRADES
Loan Receivables	1,174,000	1,262,000
Commercial Mortgages (Non-Owner Occupied)
INTERNAL RISK RATING GRADES
Loan Receivables	15,717,000	14,626,000
Commercial Mortgages (Non-Owner Occupied) | Pass
INTERNAL RISK RATING GRADES
Loan Receivables	10,509,000	9,083,000
Commercial Mortgages (Non-Owner Occupied) | Watch
INTERNAL RISK RATING GRADES
Loan Receivables	4,869,000	5,204,000
Commercial Mortgages (Non-Owner Occupied) | Substandard
INTERNAL RISK RATING GRADES
Loan Receivables	339,000	339,000
Commercial Mortgages (Owner Occupied)
INTERNAL RISK RATING GRADES
Loan Receivables	32,234,000	34,177,000
Commercial Mortgages (Owner Occupied) | Pass
INTERNAL RISK RATING GRADES
Loan Receivables	22,580,000	23,984,000
Commercial Mortgages (Owner Occupied) | Watch
INTERNAL RISK RATING GRADES
Loan Receivables	4,534,000	7,429,000
Commercial Mortgages (Owner Occupied) | Special Mention
INTERNAL RISK RATING GRADES
Loan Receivables	3,379,000	1,001,000
Commercial Mortgages (Owner Occupied) | Substandard
INTERNAL RISK RATING GRADES
Loan Receivables	1,741,000	1,763,000
Commercial and Industrial loans
INTERNAL RISK RATING GRADES
Loan Receivables	22,678,000	23,938,000
Commercial and Industrial loans | Pass
INTERNAL RISK RATING GRADES
Loan Receivables	19,217,000	20,309,000
Commercial and Industrial loans | Watch
INTERNAL RISK RATING GRADES
Loan Receivables	2,433,000	2,743,000
Commercial and Industrial loans | Special Mention
INTERNAL RISK RATING GRADES
Loan Receivables	713,000	487,000
Commercial and Industrial loans | Substandard
INTERNAL RISK RATING GRADES
Loan Receivables	$ 315,000	$ 399,000