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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets (Detail) - Core Deposit and Other Intangibles [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 7,697 $ 9,378
Accumulated Amortization $ 5,498 $ 7,488