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Loans and Allowance for Loan Losses - Additional Information (Detail)
Age in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2021
USD ($)
SecurityLoan
Loans
Modification
Jun. 30, 2020
USD ($)
SecurityLoan
Loans
Modification
Age
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   $ 1,264,000 1,330,000
Investment recorded prior to modification   $ 0 $ 61,000
Number of Modifications | Modification   0 1
Residential real estate properties foreclosure proceedings   $ 34,000 $ 41,000
Foreclosed residential real estate properties   259,000 386,000
Loans and Leases Receivable, Gross   520,526,000 515,887,000
Fair Value, Concentration of Risk, Collateral Policy [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Commercial and multi-family real estate   274,892,000 256,015,000
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   $ 68,000 186,000
Commercial [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Troubled debt restructurings, Impaired loans     0
Investment recorded prior to modification     $ 61,000
Number of Modifications | Modification     1
Loans and Leases Receivable, Gross   155,884,000 $ 145,113,000
Commercial Business Loans [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Troubled debt restructurings, Impaired loans   46,000 59,000
Investment recorded prior to modification   $ 0 $ 61,000
Number of Modifications   0 1
Loans and Leases Receivable, Gross   $ 103,088,000 $ 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%  
Commercial Portfolio And Commercial Residential Portfolio [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of loans as on closing date | Loans   364 295
Loans and Leases Receivable, Gross   $ 20.6 $ 26,200,000
One- to four-family [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Loans held for sale   $ 632,000 552,000
Maximum term of fixed-rate one- to four-family residential mortgage loans   15 years  
Troubled debt restructurings, Impaired loans   $ 1,218,000 1,256,000
Amount of troubled debt restructurings in accrual status     1,300,000
Investment recorded prior to modification   $ 0 $ 0
Number of Modifications | Modification   0 0
Investment recorded post modification   $ 127,000 $ 118,000
Loans and Leases Receivable, Gross   $ 117,435,000 $ 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   $ 118,000 $ 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   3,578,000 4,181,000
Approximate amount of loans included on out-of-area participation   26,870,000 23,950,000
Amount within 100 miles of primary area   9,718,000 $ 8,126,000
Troubled Debt Restructurings [Member] | Covid Nineteen [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Investment recorded post modification   $ 72,100,000  
Troubled Debt Restructurings [Member] | Modification one [Member] | Covid Nineteen [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of Modifications | Loans   139  
Financing Receivable, Modifications, Post-Modification Recorded Investment   $ 66,100,000  
Troubled Debt Restructurings [Member] | Modification Two [Member] | Covid Nineteen [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of Modifications | Loans   132  
Financing Receivable, Modifications, Post-Modification Recorded Investment   $ 6,000,000  
Foreclosure [Member] | Troubled Debt Restructurings [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of default loans | SecurityLoan   0 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