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Loans and Allowance for Loan Losses - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Loans
SecurityLoan
Sep. 30, 2020
USD ($)
Dec. 31, 2019
Jun. 30, 2021
USD ($)
SecurityLoan
Jun. 30, 2020
USD ($)
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 $ 1,095,000       $ 1,264,000
Number of default loans | SecurityLoan 0        
Investment recorded prior to modification   $ 0   0  
Residential real estate properties foreclosure proceedings $ 34,000        
Loans and Leases Receivable, Gross 512,984,000 525,033,000   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 280,257,000     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        
Commercial Business Loans [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Troubled debt restructurings, Impaired loans $ 43,000       46,000
Loans and Leases Receivable, Gross $ 88,962,000 109,182,000   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 165        
Loans and Leases Receivable, Gross $ 14.3        
One- to four-family [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Loans held for sale $ 216,000     632,000  
Maximum term of fixed-rate one- to four-family residential mortgage loans 15 years        
Troubled debt restructurings, Impaired loans $ 1,052,000       $ 1,218,000
Investment recorded post modification 118,000        
Loans and Leases Receivable, Gross 117,854,000 $ 125,574,000   $ 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 1,648,000     $ 3,578,000  
Approximate amount of loans included on out-of-area participation 25,577,000     26,870,000  
Amount within 100 miles of primary area 8,542,000     $ 9,718,000  
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Investment recorded post modification $ 66,700,000        
Troubled Debt Restructurings [Member] | Modification one [Member] | Covid Nineteen [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Loans 122        
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 64,200,000        
Troubled Debt Restructurings [Member] | Modification Two [Member] | Covid Nineteen [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Loans 118        
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 2,500,000        
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