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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 ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Financial assets
Cash and cash equivalents	$ 13,582	$ 10,988
Interest-bearing time deposits in banks	1,250	1,250
Loans, net of allowance for loan losses	614,598	587,457
Federal Home Loan Bank stock	4,764	3,127
Accrued interest receivable	3,223	2,781
Financial liabilities
Deposits	687,148	735,314
Repurchase agreements	16,038	10,787
Federal Home Loan Bank advances	90,500	19,500
Advances from borrowers for taxes and insurance	779	1,233
Accrued interest payable	2,737	1,666
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	13,582	10,988
Interest-bearing time deposits in banks	1,250	1,250
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	4,764	3,127
Accrued interest receivable	3,223	2,781
Financial liabilities
Deposits	390,274	451,718
Repurchase agreements	16,038	10,787
Federal Home Loan Bank advances	90,407	19,382
Advances from borrowers for taxes and insurance	779	1,233
Accrued interest payable	2,737	1,666
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 loan losses	590,319	564,432
Financial liabilities
Deposits	295,909	282,351
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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Interest-bearing time deposits in banks.

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Interest bearing time deposits in banks.

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Unrecognized financial instruments (net of contract amount).

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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))
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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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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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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of interest payable on debt, including, but not limited to, trade payables.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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