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Commitments and Credit Risk - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Commitments And Contingencies Disclosure [Line Items]
Outstanding commitments to originate loans amount	$ 16,873,000	$ 5,430,000
Loan amount commitments at fixed rates of interest	$ 5,178,000	$ 2,959,000
Weighted average interest rates for fixed rate loan commitments	3.49%	5.03%
Commercial [Member]
Commitments And Contingencies Disclosure [Line Items]
Lines of credit to borrowers	$ 78,600,000	$ 44,070,000
Open End Consumer Lines [Member]
Commitments And Contingencies Disclosure [Line Items]
Lines of credit to borrowers	$ 7,582,000	$ 6,726,000

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- References

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- Definition

Outstanding commitments to originate loans amount

+ References

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- Definition

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

+ References

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788

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- Definition

Unused amount of commitments to extend credit to customers.

+ References

No definition available.

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