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Disclosures about Fair Value of Assets - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 190,475	$ 201,299
Mortgage servicing rights	1,491	1,482	$ 1,463
U.S. Treasury [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	444	438
US Government and federal agency [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	6,609	6,477
Mortgage-backed securities – GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	166,236	175,726
Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	14,086	15,233
State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	3,100	3,425
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	444
Significant Other Observable Inputs (Level 2) [Member]
Available-for-sale securities:
Mortgage servicing rights	0	0
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	0	438
Significant Other Observable Inputs (Level 2) [Member] | US Government and federal agency [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	6,609	6,477
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed securities – GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	166,236	175,726
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	14,086	15,233
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	1,043	1,064
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Mortgage servicing rights	1,491	1,482
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 2,057	$ 2,361

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