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Loan Quality and Allowance for Loan Losses - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]    
Unpaid principal balance of impaired loans $ 43,230 $ 45,774
Loans Acquired at Fair Value [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans acquired with deteriorated credit quality 8,363 10,138
Unpaid principal balance of impaired loans 19,066 19,749
Financing receivable, allowance for credit losses, individually evaluated for impairment 397 568
Nonperforming Financing Receivable [Member] | Loans Acquired at Fair Value [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans acquired with deteriorated credit quality 9,900 11,778
Unpaid principal balance of impaired loans 8,363 10,138
Financing receivable, recorded investment, nonaccrual status 9,359 8,934
Uncertain Cash Flow [Member] | Loans Acquired at Fair Value [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing receivable, recorded investment, nonaccrual status 1,322 2,374
Financing receivable, allowance for credit losses, individually evaluated for impairment $ 81 $ 98