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Loans and Allowance for Credit Losses - Additional Information (Detail)
 12 Months Ended
Jun. 30, 2023
USD ($)
SecurityLoan
Jun. 30, 2022
USD ($)
Loans
SecurityLoan
Loans and Allowance for Credit Losses [Line Items]    
Maximum amount of one-to-four family residential mortgage loans can be approved by loan officer $ 100,000  
Maximum amount of other secured loans real estate loans can be approved by loan officer 50,000  
Maximum amount of unsecured loans real estate loans can be approved by loan officer 10,000  
Maximum amount of one-to-four family residential mortgage loans can be approved by managing officer 375,000  
Maximum amount other secured loans residential mortgage loans can be approved by managing officer 375,000  
Maximum amount of unsecured loans residential mortgage loans can be approved by managing officer 100,000  
Maximum amount of unsecured loans real estate loans can be approved by loan committee 500,000  
Maximum aggregate loan amount of one-to four-family residential mortgage loans, commercial real estate loans, multi-family real estate loans and land loans can be approved by loan committee $ 2,000,000  
Maximum term of fixed-rate one- to four-family residential mortgage loans 15 years  
Number of default loans | SecurityLoan 0 0
Investment recorded prior to modification $ 0 $ 0
Foreclosed residential real estate properties 31,000 120,000
Fair Value, Concentration of Risk, Collateral Policy [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Commercial and multi-family real estate $ 328,721,000 290,972,000
Troubled Debt Restructurings [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Minimum period for default 90 days  
Residential Real Estate [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Foreclosed residential real estate properties $ 25,000 120,000
One- to four-family [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Loans held for sale $ 0 227,000
Maximum term of fixed-rate one- to four-family residential mortgage loans 15 years  
Purchased Loans and Loan Participations [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Approximate amount of purchase loans included in loans receivable $ 652,000 1,570,000
Approximate amount of loans included on out-of-area participation 46,073,000 29,972,000
Amount within 100 miles of primary area $ 28,951,000 $ 13,234,000
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Number of Modifications | Loans   93
Investment recorded post modification   $ 48,300,000
Troubled Debt Restructurings [Member] | Modification one [Member] | Covid Nineteen [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Number of Modifications | Loans   90
Financing Receivable, Modifications, Post-Modification Recorded Investment   $ 45,200,000
Troubled Debt Restructurings [Member] | Modification Two [Member] | Covid Nineteen [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Number of Modifications | Loans   3
Financing Receivable, Modifications, Post-Modification Recorded Investment   $ 3,100,000
Non troubled debt restructuring [Member] | Covid Nineteen [Member] | Financing receivables, 30 to 59 days past due [Member]    
Loans and Allowance for Credit Losses [Line Items]    
Financing receivable number of days past due   30 days
Period of loan excecution   60 days