Impaired Loans and Allowance for Loan Losses - Troubled Debt Restructurings Defaulted (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract	Dec. 31, 2011 Contract
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	7	1
Recorded Investment	$ 328	$ 913	$ 220
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Recorded Investment	1,620
Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1
Recorded Investment			37
Commercial and Financial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1
Recorded Investment			$ 8