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Loans and Allowance for Loan Losses - Additional Information (Detail)
 9 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Loans
SecurityLoan
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
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    
Troubled debt restructurings, Impaired loans $ 1,080,000   1,264,000
Number of default loans | SecurityLoan 0    
Investment recorded prior to modification   $ 0 0
Residential real estate properties foreclosure proceedings $ 34,000    
Foreclosed residential real estate properties 120,000   259,000
Loans and Leases Receivable, Gross 505,712,000 511,318,000 520,526,000
Special Mention [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans and Leases Receivable, Gross 2,913,000   6,919,000
Substandard [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans and Leases Receivable, Gross 7,268,000   861,000
Fair Value, Concentration of Risk, Collateral Policy [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Commercial and multi-family real estate 278,958,000   274,892,000
Troubled Debt Restructurings [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Troubled debt restructurings, Impaired loans $ 1,100,000    
Minimum period for default 90 days    
Residential Real Estate [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Foreclosed residential real estate properties $ 120,000    
Commercial Business Loans [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Troubled debt restructurings, Impaired loans 38,000   46,000
Loans and Leases Receivable, Gross 81,399,000 103,326,000 103,088,000
Commercial Business Loans [Member] | Special Mention [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans and Leases Receivable, Gross 871,000   5,964,000
Commercial Business Loans [Member] | Substandard [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans and Leases Receivable, Gross $ 4,535,000   46,000
Commercial Business Loans [Member] | Small Business Administration Paycheck Protection Programme Loans [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Percentage of government guarantee for loans as per scheme 100.00%    
Commercial Portfolio And Commercial Residential Portfolio [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of loans as on closing date | Loans 18    
Loans and Leases Receivable, Gross $ 1,200,000    
One- to four-family [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans held for sale $ 475,000   632,000
Maximum term of fixed-rate one- to four-family residential mortgage loans 15 years    
Troubled debt restructurings, Impaired loans $ 1,042,000   1,218,000
Investment recorded post modification 118,000    
Loans and Leases Receivable, Gross 124,590,000 $ 116,363,000 117,435,000
One- to four-family [Member] | Special Mention [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans and Leases Receivable, Gross 1,123,000    
One- to four-family [Member] | Substandard [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans and Leases Receivable, Gross 418,000   $ 455,000
One- to four-family [Member] | Troubled Debt Restructurings [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of default loans | SecurityLoan     1
Investment recorded post modification 118,000    
Purchased Loans and Loan Participations [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Approximate amount of purchase loans included in loans receivable 1,585,000   $ 3,578,000
Approximate amount of loans included on out-of-area participation 26,851,000   26,870,000
Amount within 100 miles of primary area 10,014,000   $ 9,718,000
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Investment recorded post modification $ 53,300,000    
Troubled Debt Restructurings [Member] | Modification one [Member] | Covid Nineteen [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of Modifications | Loans 106    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 50,200,000    
Troubled Debt Restructurings [Member] | Modification Two [Member] | Covid Nineteen [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of Modifications | Loans 103    
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 3,100,000    
Troubled Debt Restructurings [Member] | Modification Two [Member] | Covid Nineteen [Member] | Special Mention [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of Modifications | Loans 2    
Troubled Debt Restructurings [Member] | Modification Two [Member] | Covid Nineteen [Member] | Substandard [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of Modifications | Loans 1    
Foreclosure [Member] | Troubled Debt Restructurings [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of default loans | SecurityLoan     0
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