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Loan Quality and Allowance for Loan Losses - Troubled Debt Restructurings of Loans Receivable (Detail)
$ in Thousands
12 Months Ended
Jun. 30, 2015
USD ($)
Loan
Jun. 30, 2013
USD ($)
Loan
Originated and Purchased Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 8 8
Pre-modification outstanding recorded investment $ 2,672 $ 1,408
Post-modification outstanding recorded investment 2,521 1,261
Charge offs against the allowance for loan loss for impairment recognized at modification $ 302 $ 180
Number of loans | Loan 1  
Outstanding recorded investment $ 416  
Originated and Purchased Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 5 5
Pre-modification outstanding recorded investment $ 1,955 $ 967
Post-modification outstanding recorded investment 1,823 852
Charge offs against the allowance for loan loss for impairment recognized at modification $ 261 $ 146
Number of loans | Loan 1  
Outstanding recorded investment $ 416  
Originated and Purchased Loans [Member] | Commercial Mortgage [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 1 1
Pre-modification outstanding recorded investment $ 369 $ 265
Post-modification outstanding recorded investment 376 245
Charge offs against the allowance for loan loss for impairment recognized at modification $ 14 $ 20
Originated and Purchased Loans [Member] | Commercial Business [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 2  
Pre-modification outstanding recorded investment $ 348  
Post-modification outstanding recorded investment 322  
Charge offs against the allowance for loan loss for impairment recognized at modification $ 27  
Originated and Purchased Loans [Member] | Home Equity Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan   2
Pre-modification outstanding recorded investment   $ 176
Post-modification outstanding recorded investment   164
Charge offs against the allowance for loan loss for impairment recognized at modification   $ 14
Loans Acquired at Fair Value [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 2  
Pre-modification outstanding recorded investment $ 511  
Post-modification outstanding recorded investment 569  
Charge offs against the allowance for loan loss for impairment recognized at modification $ 25  
Loans Acquired at Fair Value [Member] | Commercial Mortgage [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 1  
Pre-modification outstanding recorded investment $ 479  
Post-modification outstanding recorded investment 537  
Charge offs against the allowance for loan loss for impairment recognized at modification $ 24  
Loans Acquired at Fair Value [Member] | Commercial Business [Member]    
Financing Receivable, Modifications [Line Items]    
Number of loans | Loan 1  
Pre-modification outstanding recorded investment $ 32  
Post-modification outstanding recorded investment 32  
Charge offs against the allowance for loan loss for impairment recognized at modification $ 1