Impaired Loans and Allowance for Loan Losses - Modified Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	22
Pre-Modification Outstanding Recorded Investment	$ 5,103
Post-Modification Outstanding Recorded Investment	4,554
Specific Reserve Recorded	0
Valuation Allowance Recorded	549
Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	14
Post-Modification Outstanding Recorded Investment	13
Specific Reserve Recorded	0
Valuation Allowance Recorded	1
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	11
Pre-Modification Outstanding Recorded Investment	1,422
Post-Modification Outstanding Recorded Investment	1,254
Specific Reserve Recorded	0
Valuation Allowance Recorded	168
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	7
Pre-Modification Outstanding Recorded Investment	3,421
Post-Modification Outstanding Recorded Investment	3,059
Specific Reserve Recorded	0
Valuation Allowance Recorded	362
Commercial and Financial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2
Pre-Modification Outstanding Recorded Investment	154
Post-Modification Outstanding Recorded Investment	154
Specific Reserve Recorded	0
Valuation Allowance Recorded	0
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1
Pre-Modification Outstanding Recorded Investment	92
Post-Modification Outstanding Recorded Investment	74
Specific Reserve Recorded	0
Valuation Allowance Recorded	$ 18