Allowance for Loan Losses - Troubled Debt Restructurings that Subsequently Defaulted (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 Contracts
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring loan subsequent default, Number of contracts			4
Troubled debt restructuring loan subsequent default, Recorded investment	$ 0	$ 0	$ 596,000
Real Estate Loans [Member] \| Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring loan subsequent default, Number of contracts			1
Troubled debt restructuring loan subsequent default, Recorded investment			235,000
Real Estate Loans [Member] \| Secured by 1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring loan subsequent default, Number of contracts
Troubled debt restructuring loan subsequent default, Recorded investment
Real Estate Loans [Member] \| Other Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring loan subsequent default, Number of contracts			3
Troubled debt restructuring loan subsequent default, Recorded investment			361,000
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring loan subsequent default, Number of contracts
Troubled debt restructuring loan subsequent default, Recorded investment
Consumer and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring loan subsequent default, Number of contracts
Troubled debt restructuring loan subsequent default, Recorded investment