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Stock-based Compensation - Additional Information (Detail) - USD ($) |  | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 10, 2013 | Dec. 31, 2020 | Dec. 31, 2016 | Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2021 | Dec. 10, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares paid under ESOP |  |  |  | 353,222 |  | 357,084 |
Employee Stock Ownership Plan Esop [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Minimum hours of service required |  |  |  | 1000 hours |  |  |
Minimum age of employee to attain the plan |  |  |  | 21 days |  |  |
Shares to be purchased for ESOP, from borrowed funds |  |  |  | 384,900 |  |  |
Shares to be purchased for ESOP, percentage of common stock |  |  |  | 8.00% |  |  |
Repayment of loan on ESOP |  |  |  | 20 years |  |  |
Percentage vested in accrued benefits |  |  |  | 100.00% |  |  |
Employee Stock Ownership Plan Esop [Member] | Employee Severance [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares paid under ESOP |  |  |  | 3,862 | 878 |  |
Employee Stock Ownership Plan Esop [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Prorated vesting period |  |  |  | 2 years |  |  |
Employee Stock Ownership Plan Esop [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Prorated vesting period |  |  |  | 5 years |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized |  |  |  | 673,575 |  |  |
Equity Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 7 years |  |  |  |  |  |
Shares authorized | 167,000 |  |  | 481,125 |  |  |
Restricted stock available for future grants |  |  |  | 314,125 |  |  |
Stock options granted |  |  |  | 0 |  |  |
Options vested during the period |  |  |  | 0 | 22,286 |  |
Weighted average recognition period for non-vested restricted stock awards |  | 7 years |  |  |  |  |
Unrecognized compensation expense for non-vested restricted stock awards |  |  |  | $ 0 |  |  |
Stock based compensation expense |  |  |  | 119,000 | $ 127,000 |  |
Tax benefit |  |  |  | $ 34,000 | $ 36,000 |  |
Equity Incentive Plan [Member] | Restricted Stock And Restricted Stock Units Rsu [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized |  |  |  | 192,450 |  |  |
Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 10 years |  | 8 years |  |  |  |
Shares authorized | 85,500 |  |  |  |  |  | 16,900
Restricted stock available for future grants |  |  |  | 91,800 |  |  |
Weighted average recognition period for non-vested restricted stock awards |  |  |  | 1 year 8 months 12 days |  |  |
Unrecognized compensation expense for non-vested restricted stock awards |  |  |  | $ 290,000 |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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