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Premises and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 70,640 $ 69,374
Land Held For Future Branch Expansion [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,419 $ 2,419