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Disclosures About Fair Value of Assets - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($)	Sep. 30, 2023	Jun. 30, 2023
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 191,112,000	$ 201,299,000
Mortgage servicing rights	1,540,000	1,482,000
U.S. Treasury [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	430,000	438,000
U.S. Government and federal agency and Government sponsored enterprises (GSE's) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	6,427,000	6,477,000
Mortgage-backed: GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	166,578,000	175,726,000
Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	14,268,000	15,233,000
State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	3,409,000	3,425,000
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	430,000	438,000
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and federal agency and Government sponsored enterprises (GSE's) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	6,427,000	6,477,000
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed: GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	166,578	175,726,000
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	14,268,000	15,233,000
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	1,048,000	1,064,000
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Mortgage servicing rights	1,540,000	1,482,000
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 2,361,000	$ 2,361,000

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Fair value assets measured on recurring basis.

+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481229/860-50-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-2

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