Employee Stock Ownership Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Eligible compensation for ESOP	$ 265,000
Cash contributions and expense recorded for the ESOP	$ 450,000	$ 400,000	$ 475,000
Employee stock ownership plan outstanding shares	763,303
Percentage of outstanding shares	6.40%