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Subsequent Events - Additional Information (Detail) (Subsequent Events, USD $)	1 Months Ended
	Aug. 07, 2013 Director
Subsequent Event [Line Items]
Cash dividend approved per common share	$ 0.10
Restricted Stock Units
Subsequent Event [Line Items]
Directors restricted stock units with a grant date value	$ 75,000
Number of directors	2

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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