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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 8,249 $ 8,093
Accumulated Amortization 6,755 6,002
Estimated amortization expense 1,494 2,091
MSRs [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 975 819
Accumulated Amortization 279 195
Estimated amortization expense 696 624
Core deposit intangibles [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 7,274 7,274
Accumulated Amortization 6,476 5,807
Estimated amortization expense $ 798 $ 1,467