Basis of Financial Statement Presentation - Additional Information (Detail)	Jul. 07, 2011 USD ($) shares
Organization and Basis of Presentation [Line Items]
Shares purchased at employee stock ownership plan, shares	384,900
Iroquois Federal Foundation [Member]
Organization and Basis of Presentation [Line Items]
Number of donated shares of common stock	314,755
Cash contributed to the foundation | $	$ 450,000