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Loans and Allowance for Loan Losses - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
SecurityLoan
Modification
Loans
Sep. 30, 2020
USD ($)
SecurityLoan
Modification
Loans
Dec. 31, 2019
Jun. 30, 2020
USD ($)
SecurityLoan
Modification
Sep. 30, 2019
USD ($)
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 $ 100,000      
Maximum amount of other secured loans real estate loans can be approved by loan officer 50,000 50,000      
Maximum amount of unsecured loans real estate loans can be approved by loan officer 10,000 10,000      
Maximum amount of one-to-four family residential mortgage loans can be approved by managing officer 375,000 375,000      
Maximum amount other secured loans residential mortgage loans can be approved by managing officer 375,000 375,000      
Maximum amount of unsecured loans residential mortgage loans can be approved by managing officer 100,000 100,000      
Maximum amount of unsecured loans real estate loans can be approved by loan committee 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      
Troubled debt restructurings, Impaired loans 1,298,000 1,298,000   $ 1,330,000  
Foreclosed residential real estate properties 440,000 440,000   386,000  
Residential real estate properties foreclosure proceedings 34,000 $ 34,000      
Minimum period for default   90 days      
Loans and Leases Receivable, Gross 525,033,000 $ 525,033,000   515,887,000 $ 496,903,000
Fair Value, Concentration of Risk, Collateral Policy [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Commercial and multi-family real estate 267,104,000 267,104,000   $ 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      
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Investment recorded prior to modification   83,100,000      
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 $ 26,400,000 26,400,000      
Troubled Debt Restructurings [Member] | Covid Nineteen [Member] | Modification Two [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Modification 123        
Financing Receivable, Modifications, Post-Modification Recorded Investment $ 56,700,000 56,700,000      
Residential Real Estate [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Foreclosed residential real estate properties 209,000 209,000      
Commercial [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of Modifications | Modification       1  
Loans and Leases Receivable, Gross 157,096,000 157,096,000   $ 145,113,000 146,500,000
Commercial Business Loans [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Investment recorded prior to modification       61,000  
Loans and Leases Receivable, Gross $ 109,182,000 $ 109,182,000   107,581,000 84,825,000
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%      
Commercial Portfolio And Commercial Residential Portfolio [Member]          
Loans and Allowance for Credit Losses [Line Items]          
Number of loans as on closing date | Loans 304 304      
Loans and Leases Receivable, Gross $ 26,300,000 $ 26,300,000      
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 $ 1,243,000 $ 1,243,000   $ 1,256,000  
Number of default loans | SecurityLoan   1   1  
Number of troubled debt restructurings in accrual status | SecurityLoan 9 9   9  
Amount of troubled debt restructurings in accrual status $ 1,200,000 $ 1,200,000   $ 1,300,000  
Investment recorded post modification   125,000   127,000  
Loans and Leases Receivable, Gross 125,574,000 $ 125,574,000   $ 128,876,000 $ 126,152,000
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 3,895,000 $ 3,895,000   4,181,000  
Approximate amount of loans included on out-of-area participation 25,354,000 25,354,000   23,950,000  
Amount within 100 miles of primary area $ 7,853,000 $ 7,853,000   $ 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   181      
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   $ 125,000      
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