Earnings Applicable to Common Stockholders (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share Basic [Line Items]
Net income available to common stock holders, basic	$ 2,099,000	$ 1,527,000	$ 4,043,000	$ 2,848,000
Net income available to common stock holders, diluted	$ 2,099,000	$ 1,527,000	$ 4,043,000	$ 2,848,000
Effect of dilutive shares:
Weighted average number of shares outstanding, basic	5,374,415	5,152,784	5,366,495	5,142,227
Effect of dilutive shares: Restricted stock grants	57,747	37,792	57,747	37,792
Weighted average number of shares outstanding, diluted	5,432,162	5,190,576	5,424,242	5,180,019
Basic per share	$ 0.39	$ 0.30	$ 0.75	$ 0.55
Diluted per share	$ 0.39	$ 0.29	$ 0.75	$ 0.55