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Loans and Allowance for Loan Losses - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
SecurityLoan
Modification
Loans
Dec. 31, 2020
USD ($)
SecurityLoan
Modification
Loans
Dec. 31, 2020
USD ($)
SecurityLoan
Loans
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
SecurityLoan
Modification
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 $ 100,000 $ 100,000    
Maximum amount of other secured loans real estate loans can be approved by loan officer 50,000 50,000 50,000    
Maximum amount of unsecured loans real estate loans can be approved by loan officer 10,000 10,000 10,000    
Maximum amount of one-to-four family residential mortgage loans can be approved by managing officer 375,000 375,000 375,000    
Maximum amount other secured loans residential mortgage loans can be approved by managing officer 375,000 375,000 375,000    
Maximum amount of unsecured loans residential mortgage loans can be approved by managing officer 100,000 100,000 100,000    
Maximum amount of unsecured loans real estate loans can be approved by loan committee 500,000 500,000 500,000    
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 2,000,000 2,000,000    
Troubled debt restructurings, Impaired loans 1,284,000 1,284,000 1,284,000   $ 1,330,000
Foreclosed residential real estate properties 377,000 377,000 377,000   386,000
Residential real estate properties foreclosure proceedings 34,000 $ 34,000 34,000    
Minimum period for default   90 days      
Loans and Leases Receivable, Gross 513,298,000 $ 513,298,000 513,298,000 $ 496,397,000 515,887,000
Fair Value, Concentration of Risk, Collateral Policy [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Commercial and multi-family real estate 264,821,000 264,821,000 264,821,000   $ 256,015,000
Troubled Debt Restructurings [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Troubled debt restructurings, Impaired loans 1,300,000 1,300,000 1,300,000    
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Investment recorded prior to modification   85,700,000      
Troubled Debt Restructurings [Member] | Covid Nineteen [Member] | Modification One [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 58,500,000 58,500,000 58,500,000    
Troubled Debt Restructurings [Member] | Covid Nineteen [Member] | Modification Two [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Modification 21        
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 27,200,000 27,200,000 27,200,000    
Residential Real Estate [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Foreclosed residential real estate properties 177,000 177,000 177,000    
Commercial [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Modification         1
Loans and Leases Receivable, Gross 152,448,000 152,448,000 152,448,000 148,299,000 $ 145,113,000
Commercial Business Loans [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Amount of troubled debt restructurings in accrual status 51,000,000 51,000,000 51,000,000    
Investment recorded prior to modification         61,000
Loans and Leases Receivable, Gross $ 101,528,000 $ 101,528,000 $ 101,528,000 82,692,000 107,581,000
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% 100.00% 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 191 191 191    
Loans and Leases Receivable, Gross $ 17,400,000 $ 17,400,000 $ 17,400,000    
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 $ 1,233,000 $ 1,233,000 $ 1,233,000   $ 1,256,000
Number of default loans | SecurityLoan     1   1
Number of troubled debt restructurings in accrual status | SecurityLoan 9 9 9   9
Amount of troubled debt restructurings in accrual status $ 1,200,000 $ 1,200,000 $ 1,200,000   $ 1,300,000
Investment recorded post modification   123,000     127,000
Loans and Leases Receivable, Gross 123,493,000 $ 123,493,000 123,493,000 $ 127,679,000 $ 128,876,000
One- to four-family [Member] | Troubled Debt Restructurings [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of default loans | SecurityLoan   1     1
Investment recorded post modification         $ 127,000
Purchased Loans and Loan Participations [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Approximate amount of purchase loans included in loans receivable 3,768,000 $ 3,768,000 3,768,000   4,181,000
Approximate amount of loans included on out-of-area participation 24,913,000 24,913,000 24,913,000   23,950,000
Amount within 100 miles of primary area $ 7,528,000 $ 7,528,000 $ 7,528,000   $ 8,126,000
Troubled Debt Restructurings [Member] | Covid Nineteen [Member] | Modification One [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Modification   169      
Foreclosure [Member] | Troubled Debt Restructurings [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of default loans | SecurityLoan     0   0
Investment recorded post modification default loans   $ 123,000      
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 execution       60 days