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Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) Banking_Office | Jun. 30, 2022 USD ($) | Jul. 01, 2022 USD ($) | Jun. 30, 2021 USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Number of full service banking offices | Banking_Office | 7 |  |  |
Interest-bearing deposits, maturity period (in months) | 3 years |  |  |
Liquid investments with original maturity period | 3 months |  |  |
Accrual of interest on loans due discontinued period, in days | 90 days |  |  |
Percentage of minimum likelihood of realized tax benefit upon settlement | 50.00% |  |  |
Cash, Uninsured Amount | $ 350,000 |  |  |
Federal home loan bank stock and federal reserve bank stock | 5,080,000 |  |  |
Long-Lived Asset Impairment | 0 | $ 0 |  |
Retained earnings | 43,365,000 | 40,362,000 |  |
Allowance for loan losses | 7,139,000 | 7,052,000 |  | $ 6,599,000
Allowance for credit losses on off-balance sheet credit exposure | $ 216,000 | $ 0 | $ 496,000,000 |
Accounting Standards Update 2016-13 [Member] |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Retained earnings |  |  | 388,000 |
Allowance for loan losses |  |  | 47,000 |
Allowance for credit losses on off-balance sheet credit exposure |  |  | $ 496,000 |
Sales [Member] |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |  |
Percentage of major customer revenues | 10.00% |  |  |

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