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Disclosures About Fair Value of Assets - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 189,824	$ 187,753
Mortgage servicing rights	1,430	1,429
U.S. Government and federal agency and Government sponsored enterprises (GSE's) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	916	1,812
Mortgage-backed: GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	174,345	171,079
Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	12,815	13,114
State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	1,748	1,748
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	916	1,812
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed: GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	174,345	171,079
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	12,815	13,114
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Mortgage servicing rights	1,430	1,429
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 1,748	$ 1,748

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