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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 |

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