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Loans and Allowance for Loan Losses - Additional Information (Detail)
 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2020
USD ($)
SecurityLoan
Modification
Loans
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
SecurityLoan
Jun. 30, 2019
USD ($)
Modification
Jun. 30, 2019
SecurityLoan
Jun. 30, 2019
TDRs
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 $ 2,000,000 $ 2,000,000 $ 2,000,000    
Maximum amount other secured loans residential mortgage loans can be approved by managing officer   375,000 500,000 500,000 500,000    
Maximum amount of unsecured loans residential mortgage loans can be approved by managing officer   $ 100,000          
Maximum term of fixed-rate one- to four-family residential mortgage loans   15 years          
Troubled debt restructurings, Impaired loans   $ 1,330,000 1,505,000 $ 1,505,000 $ 1,505,000    
Investment recorded prior to modification   $ 61,000 159,000        
Number of Modifications   1   4 1    
Residential real estate properties foreclosure proceedings   $ 41,000 200,000 $ 200,000 $ 200,000    
Foreclosed residential real estate properties   386,000 778,000 778,000 778,000    
Loans and Leases Receivable, Gross   515,887,000 493,753,000 493,753,000 493,753,000    
Fair Value, Concentration of Risk, Collateral Policy [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Commercial and multi-family real estate   256,015,000 260,888,000,000 260,888,000,000 260,888,000,000    
Troubled Debt Restructurings [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Troubled debt restructurings, Impaired loans   $ 1,300,000          
Minimum period for default   90 days          
Residential Real Estate [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Foreclosed residential real estate properties   $ 186,000 539,000 539,000 539,000    
Consumer [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Amount of troubled debt restructurings in accrual status   1,000,000,000 2,000 2,000 2,000    
Loans and Leases Receivable, Gross   7,529,000 7,136,000 $ 7,136,000 7,136,000    
Consumer [Member] | Troubled Debt Restructurings [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Number of Modifications | SecurityLoan       1      
Investment recorded post modification     2,000        
Commercial [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Troubled debt restructurings, Impaired loans     6,000 $ 6,000 $ 6,000    
Investment recorded prior to modification   $ 61,000 166,000        
Number of Modifications | Modification   1     0    
Loans and Leases Receivable, Gross   $ 145,113,000 143,367,000 143,367,000 $ 143,367,000    
Commercial Business Loans [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Troubled debt restructurings, Impaired loans   59,000          
Investment recorded prior to modification   $ 61,000          
Number of Modifications | Modification   1          
Loans and Leases Receivable, Gross   $ 107,581,000 84,246,000 84,246,000 84,246,000    
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   295          
Loans and Leases Receivable, Gross   $ 26.2          
One- to four-family [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Loans held for sale   $ 552,000 316,000 316,000 316,000    
Maximum term of fixed-rate one- to four-family residential mortgage loans   15 years          
Troubled debt restructurings, Impaired loans   $ 1,256,000 1,475,000 $ 1,475,000 1,475,000    
Number of default loans | SecurityLoan   1   3      
Number of troubled debt restructurings in accrual status | SecurityLoan   9       10  
Amount of troubled debt restructurings in accrual status   $ 1,300,000 1,300,000 $ 1,300,000 $ 1,300,000    
Investment recorded prior to modification   $ 0 159,000        
Number of Modifications | Modification   0     1    
Investment recorded post modification   $ 127,000 8,000        
Loans and Leases Receivable, Gross   $ 128,876,000 129,290,000 $ 129,290,000 $ 129,290,000    
One- to four-family [Member] | Troubled Debt Restructurings [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Number of default loans | SecurityLoan   1   6      
Investment recorded post modification   $ 127,000 144,000        
Purchased Loans and Loan Participations [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Approximate amount of purchase loans included in loans receivable   4,181,000 4,844,000 $ 4,844,000 4,844,000    
Approximate amount of loans included on out-of-area participation   23,950,000 29,524,000 29,524,000 29,524,000    
Amount within 100 miles of primary area   8,126,000 12,025,000 $ 12,025,000 12,025,000    
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Investment recorded prior to modification   $ 85,600,000          
Number of Modifications | Modification   176          
Foreclosure [Member] | Troubled Debt Restructurings [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Number of default loans | SecurityLoan   0   0      
Home equity lines of credit [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Troubled debt restructurings, Impaired loans   $ 15,000 22,000 $ 22,000 22,000    
Number of troubled debt restructurings in accrual status           1 1
Amount of troubled debt restructurings in accrual status     20,000 20,000 20,000    
Loans and Leases Receivable, Gross   $ 8,551,000 8,938,000 $ 8,938,000 $ 8,938,000    
Home equity lines of credit [Member] | Troubled Debt Restructurings [Member]              
Loans and Allowance for Credit Losses [Line Items]              
Number of Modifications | SecurityLoan       1      
Investment recorded post modification     $ 20,000        
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 excecution   60 days