Fair Value Measurement - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other real estate owned and repossessed assets	$ 5,106	$ 4,860
Nonrecurring Fair Value Measurements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans	1,618	1,543
Other real estate owned and repossessed assets	5,106	4,860
Minimum [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans appraisal adjustments	0.00%	0.00%
Impaired loans liquidation expenses	(1.00%)	(3.50%)
Maximum [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans appraisal adjustments	(36.10%)	(29.10%)
Impaired loans liquidation expenses	(8.00%)	(8.00%)
Weighted Average [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans appraisal adjustments	(22.70%)	(15.60%)
Impaired loans liquidation expenses	(3.70%)	(4.70%)
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring Fair Value Measurements [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Impaired loans	1,618	1,543
Other real estate owned and repossessed assets	$ 5,106	$ 4,860