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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, 2021 | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | --- | ---
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | $ 189,891 | $ 162,394 |
Mortgage servicing rights | 1,013 | 715 | $ 853
US Treasury [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 996 |  |
U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 8,039 | 8,236 |
Mortgage-backed Securities - GSE Residential [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 170,415 | 148,855 |
Small Business Administration [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 9,190 | 3,640 |
State and Political Subdivisions [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 1,251 | 1,663 |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Available-for-sale securities: |  |  |
Mortgage servicing rights | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | US Treasury [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 996 |  |
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 8,039 | 8,236 |
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed Securities - GSE Residential [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 170,415 | 148,855 |
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 9,190 | 3,640 |
Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member] |  |  |
Available-for-sale securities: |  |  |
Available-for-sale securities, Fair Value | 1,251 | 1,663 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Available-for-sale securities: |  |  |
Mortgage servicing rights | $ 1,013 | $ 715 |

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