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Loans and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Detail)
12 Months Ended
Jun. 30, 2020
USD ($)
Modification
Jun. 30, 2019
USD ($)
Jun. 30, 2019
SecurityLoan
Jun. 30, 2019
Modification
Financing Receivable, Modifications [Line Items]        
Number of Modifications 1   4 1
Recorded Investment $ 61,000 $ 159,000    
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Modifications | Modification 1     0
Recorded Investment $ 61,000 166,000    
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Modifications | Modification 1      
Recorded Investment $ 61,000      
One- to four-family [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Modifications | Modification 0     1
Recorded Investment $ 0 159,000    
Real Estate Loan [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Modifications | Modification 0     1
Recorded Investment $ 0 $ 159,000