Fair Value Disclosures - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowance for loan losses	$ 4,393,000		$ 4,393,000		$ 3,238,000
Accumulated charges to value the real estate owned	565,000		565,000		411,000
Other Real Estate, Foreclosed Assets, Valuation Adjustment	145,000	29,000	154,000	29,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value liabilities	$ 0		$ 0		$ 0