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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, 2025 | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | --- | ---
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | $ 187,753 | $ 190,475 |
Mortgage servicing rights | 1,429 | 1,491 | $ 1,482
U.S. Treasury [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value |  | 444 |
US Government and federal agency [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 1,812 | 6,609 |
Mortgage-backed securities – GSE residential [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 171,079 | 166,236 |
Small Business Administration [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 13,114 | 14,086 |
State and political subdivisions [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 1,748 | 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] | US Government and federal agency [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 1,812 | 6,609 |
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed securities – GSE residential [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 171,079 | 166,236 |
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 13,114 | 14,086 |
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 0 | 1,043 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Available-for-sale securities: |  |  |
Mortgage servicing rights | 1,429 | 1,491 |
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | $ 1,748 | $ 2,057 |

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