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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