Disclosures About Fair Value of Assets - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 192,651	$ 190,475
Mortgage servicing rights	1,366	1,491
U.S. Treasury [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value		444
U.S. Government and federal agency and Government sponsored enterprises (GSE's) [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	5,763	6,609
Mortgage-backed: GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	169,638	166,236
Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	14,152	14,086
State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	3,098	3,100
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
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	5,763	6,609
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed: GSE residential [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	169,638	166,236
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	14,152	14,086
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	1,041	1,043
Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities:
Mortgage servicing rights	1,366	1,491
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions [Member]
Available-for-sale securities:
Available-for-sale securities, Fair Value	$ 2,057	$ 2,057