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Loans and Allowance for Loan Losses - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) SecurityLoan TDRs Modification | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) SecurityLoan Banking_Office
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 |  |
Troubled debt restructurings, Impaired loans | 1,437,000 |  | $ 1,505,000
Foreclosed residential real estate properties | 432,000 |  | 778,000
Residential real estate properties foreclosure proceedings | 7,000 |  |
Fair Value, Concentration of Risk, Collateral Policy [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Commercial and multi-family real estate | 265,464,000 |  | $ 260,888,000
Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Troubled debt restructurings, Impaired loans | $ 1,400,000 |  |
Number of default loans | SecurityLoan | 0 |  | 6
Minimum period for default |  |  | 90 days
Residential Real Estate [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Foreclosed residential real estate properties | $ 213,000 |  |
Residential Real Estate [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Investment recorded post modification | 0 |  |
Commercial Real Estate [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Investment recorded post modification default loans | 1,000 |  |
Consumer [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Investment recorded post modification |  |  | $ 2,000
Consumer [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Number of default loans | SecurityLoan |  |  | 1
Investment recorded post modification |  |  | $ 2,000
Commercial [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Troubled debt restructurings, Impaired loans | 1,000 |  | 6,000
Investment recorded post modification default loans | $ 2,000 |  |
Commercial Business Loans [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Unsecured loans are limited to period | 0 months |  |
Troubled debt restructurings, Impaired loans | $ 0 |  |
Consumer Loans [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Troubled debt restructurings, Impaired loans | $ 0 |  | 2,000
Consumer Loans [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Number of default loans | SecurityLoan | 0 |  |
Investment recorded post modification | $ 0 |  |
One- to four-family [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Maximum term of fixed-rate one- to four-family residential mortgage loans | 15 years |  |
Troubled debt restructurings, Impaired loans | $ 1,420,000 |  | $ 1,475,000
Number of default loans | SecurityLoan | 2 |  |
Number of troubled debt restructurings in accrual status | 11 |  | 10
Amount of troubled debt restructurings in accrual status | $ 1.4 |  | $ 1,300,000
Investment recorded prior to modification | $ 0 | $ 166,000 | $ 166,000
Number of loans | 0 |  | 3
Investment recorded post modification |  |  | $ 8,000
One- to four-family [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Number of default loans | SecurityLoan | 0 |  |
Investment recorded post modification | $ 0 |  | 144,000
Purchased Loans and Loan Participations [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Approximate amount of purchase loans included in loans receivable | 4,235,000 |  | 4,844,000
Approximate amount of loans included on out-of-area participation | 24,838,000 |  | 29,524,000
Amount within 100 miles of primary area | $ 8,903,000 |  | $ 12,025,000
Troubled Debt Restructurings [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Number of loans | SecurityLoan |  |  | 4
Foreclosure [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Number of default loans | SecurityLoan | 131,000 |  |
Home equity lines of credit [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Troubled debt restructurings, Impaired loans | $ 16,000 |  | $ 22,000
Number of default loans | SecurityLoan | 0 |  | 1
Number of troubled debt restructurings in accrual status | TDRs | 1 |  |
Amount of troubled debt restructurings in accrual status | $ 1,000 |  | $ 1,000
Investment recorded post modification |  |  | $ 20,000
Home equity lines of credit [Member] | Troubled Debt Restructurings [Member] |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |
Number of default loans | SecurityLoan |  |  | 1
Investment recorded post modification |  |  | $ 20,000

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