Activity in Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 5,393		$ 4,727
Loans charged-off	(126)		(632)
Recoveries on loans previously charged-off	45		557
Net charge-offs	(81)		(75)
Provision for Loan Losses	360	371	1,020	744
Balance at end of period	5,672		5,672
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged-off	(50)		(356)
Recoveries on loans previously charged-off	27		492
Installment and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged-off	(41)		(171)
Recoveries on loans previously charged-off	12		51
Commercial Financial And Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged-off	(35)		(105)
Recoveries on loans previously charged-off	$ 6		$ 14