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Commitments and Credit Risk - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Commitments And Contingencies Disclosure [Line Items]
Outstanding commitments to originate loans amount	$ 8,317,000	$ 5,081,000
Loan amount commitments at fixed rates of interest	$ 2,028,000	$ 3,454,000
Weighted average interest rates for fixed rate loan commitments	7.43%	7.48%
Off-Balance-Sheet, Credit loss, Liability	$ 98,000	$ 216,000
Off-Balance-Sheet, Credit Loss,Credit Loss Expense	(118,000)	(280,000)
Commercial [Member]
Commitments And Contingencies Disclosure [Line Items]
Lines of credit to borrowers	58,696,000	80,497,000
Open End Consumer Lines [Member]
Commitments And Contingencies Disclosure [Line Items]
Lines of credit to borrowers	$ 12,545,000	$ 13,663,000

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- Definition

Outstanding commitments to originate loans amount

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No definition available.

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- Definition

Weighted average rate of interest for loans with interest payable at a certain fixed rate

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No definition available.

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- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478898/942-825-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478898/942-825-50-1

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482454/460-10-45-1

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Unused amount of commitments to extend credit to customers.

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