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Loans and Allowance for Loan Losses - Additional Information (Detail) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) SecurityLoan | Jun. 30, 2019 USD ($) SecurityLoan | Dec. 31, 2019 TDRs | Dec. 31, 2019 Banking_Office
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 |  |  |
Troubled debt restructurings, Impaired loans | 1,457,000 | $ 1,505,000 |  |
Foreclosed residential real estate properties | 435,000 | 778,000 |  |
Residential real estate properties foreclosure proceedings | 33,000 |  |  |
Fair Value, Concentration of Risk, Collateral Policy [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Commercial and multi-family real estate | 264,384,000 | $ 260,888,000 |  |
Troubled Debt Restructurings [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Troubled debt restructurings, Impaired loans | 1,500,000 |  |  |
Number of default loans | SecurityLoan |  | 6 |  |
Minimum period for default |  | 90 days |  |
Residential Real Estate [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Foreclosed residential real estate properties | $ 213,000 |  |  |
Consumer [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Consumer loans term in years | 7 years |  |  |
Unsecured loans are limited to period | 0 months |  |  |
Investment recorded post modification |  | $ 2,000 |  |
Consumer [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Number of default loans | SecurityLoan |  | 1 |  |
Investment recorded post modification |  | $ 2,000 |  |
Commercial [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Troubled debt restructurings, Impaired loans | $ 2,000 | 6,000 |  |
Investment recorded post modification default loans | 4,000 |  |  |
Commercial [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Investment recorded post modification | $ 0 |  |  |
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 | $ 1,437,000 | $ 1,475,000 |  |
Number of default loans | SecurityLoan | 2 | 3 |  |
Number of troubled debt restructurings in accrual status |  |  | 10 | 10
Amount of troubled debt restructurings in accrual status | $ 1,300,000 | $ 1,300,000 |  |
Investment recorded prior to modification |  | 159,000 |  |
Investment recorded post modification |  | $ 8,000 |  |
One- to four-family [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Number of loans | SecurityLoan | 3 | 4 |  |
Investment recorded post modification | $ 134,000 | $ 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 | 4,293,000 | 4,844,000 |  |
Approximate amount of loans included on out-of-area participation | 26,626,000 | 29,524,000 |  |
Amount within 100 miles of primary area | $ 9,341,000 | $ 12,025,000 |  |
Troubled Debt Restructurings [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Number of default loans | SecurityLoan | 3 |  |  |
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 | $ 18,000 | $ 22,000 |  |
Number of default loans | SecurityLoan |  | 1 |  |
Number of troubled debt restructurings in accrual status |  |  | 1 | 1
Amount of troubled debt restructurings in accrual status | $ 1,000 | $ 1,000 |  |
Investment recorded post modification |  | $ 20,000 |  |
Home equity lines of credit [Member] | Troubled Debt Restructurings [Member] |  |  |  |
Loans and Allowance for Credit Losses [Line Items] |  |  |  |
Number of default loans | SecurityLoan |  | 1 |  |
Investment recorded post modification |  | $ 20,000 |  |

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