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Disclosures About Fair Value of Assets - Estimated Fair Values of Financial Instruments and Level within Fair Value Hierarchy in which Fair Value Measurements Fall (Detail) - USD ($)	Mar. 31, 2024	Jun. 30, 2023
Financial assets
Cash and cash equivalents	$ 16,060,000	$ 10,988,000
Interest-bearing time deposits in banks	750,000	1,250,000
Loans, net of allowance for credit losses	643,326,000	587,457,000
Federal Home Loan Bank stock	5,419,000	3,127,000
Accrued interest receivable	3,749,000	2,781,000
Financial liabilities
Deposits	681,788,000	735,314,000
Repurchase agreements	18,182,000	10,787,000
Federal Home Loan Bank advances	95,999,000	19,500,000
Other borrowings	25,300,000	0
Advances from borrowers for taxes and insurance	1,331,000	1,233,000
Accrued interest payable	2,762,000	1,666,000
Unrecognized financial instruments (net of contract amount)
Commitments to originate loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and cash equivalents	16,060,000	10,988,000
Interest-bearing time deposits in banks	750,000	1,250,000
Unrecognized financial instruments (net of contract amount)
Commitments to originate loans	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Federal Home Loan Bank stock	5,419,000	3,127,000
Accrued interest receivable	3,749,000	2,781,000
Financial liabilities
Deposits	320,692,000	451,718,000
Repurchase agreements	18,182,000	10,787,000
Federal Home Loan Bank advances	95,643,000	19,382,000
Other borrowings	25,317,000
Advances from borrowers for taxes and insurance	1,331,000	1,233,000
Accrued interest payable	2,762,000	1,666,000
Unrecognized financial instruments (net of contract amount)
Commitments to originate loans	0	0
Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Loans, net of allowance for credit losses	633,614,000	564,432,000
Financial liabilities
Deposits	321,464,000	282,351,000
Unrecognized financial instruments (net of contract amount)
Commitments to originate loans	$ 0	$ 0

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Commitments to originate loans.

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No definition available.

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Interest-bearing time deposits in banks.

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Interest bearing time deposits in banks.

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No definition available.

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Unrecognized financial instruments (net of contract amount).

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- Definition

Carrying amount of accumulated prepayments received by financial institutions from borrowers for taxes (for example, property taxes) and insurance (for example, property and catastrophe) which will periodically be remitted to the appropriate governmental agency or vendor on behalf of the borrower.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-Publisher FASB
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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-7

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