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Loans and Allowance for Loan Losses - Additional Information (Detail) | 12 Months Ended
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Jun. 30, 2022 USD ($) Loans SecurityLoan | Jun. 30, 2021 USD ($) 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 |
Troubled debt restructurings, Impaired loans | $ 998,000 | 1,264,000
Number of default loans | SecurityLoan | 0 |
Investment recorded prior to modification |  | 0
Residential real estate properties foreclosure proceedings | $ 0 | 34,000
Foreclosed residential real estate properties | 120,000 | 259,000
Loans and Leases Receivable, Gross | 525,736,000 | 520,526,000
Fair Value, Concentration of Risk, Collateral Policy [Member] |  |
Loans and Allowance for Credit Losses [Line Items] |  |
Commercial and multi-family real estate | 290,972,000 | 274,892,000
Troubled Debt Restructurings [Member] |  |
Loans and Allowance for Credit Losses [Line Items] |  |
Troubled debt restructurings, Impaired loans | $ 998,000 |
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 | 68,000
Commercial Business Loans [Member] |  |
Loans and Allowance for Credit Losses [Line Items] |  |
Troubled debt restructurings, Impaired loans | 36,000 | 46,000
Loans and Leases Receivable, Gross | $ 80,418,000 | $ 103,088,000
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 | 0 | 364
Loans and Leases Receivable, Gross |  | $ 20,600,000
One- to four-family [Member] |  |
Loans and Allowance for Credit Losses [Line Items] |  |
Loans held for sale | $ 227,000 | 632,000
Maximum term of fixed-rate one- to four-family residential mortgage loans | 15 years |
Troubled debt restructurings, Impaired loans | $ 962,000 | 1,218,000
Investment recorded post modification | 118,000 |
Loans and Leases Receivable, Gross | 132,474,000 | $ 117,435,000
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 | 1,570,000 | 3,578,000
Approximate amount of loans included on out-of-area participation | 29,972,000 | 26,870,000
Amount within 100 miles of primary area | 13,234,000 | $ 9,718,000
Troubled Debt Restructurings [Member] | Covid Nineteen [Member] |  |
Loans and Allowance for Credit Losses [Line Items] |  |
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 | 93 |
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 | 90 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 3,100,000 |
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 |

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