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Disclosures about Fair Value of Assets and Liabilities - Fair Value Measurements of Assets Recognized on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020
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Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | $ 161,292 | $ 162,394
Mortgage servicing rights | 731 | 715
U.S. Government and Federal Agency and Government Sponsored Enterprises (GSEs) [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 8,235 | 8,236
Mortgage-backed: GSE Residential [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 147,954 | 148,855
Small Business Administration [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 3,654 | 3,640
State and Political Subdivisions [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 1,449 | 1,663
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 | 8,235 | 8,236
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed: GSE Residential [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 147,954 | 148,855
Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 3,654 | 3,640
Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member] |  |
Available-for-sale securities: |  |
Available-for-sale securities, Fair Value | 1,449 | 1,663
Significant Unobservable Inputs (Level 3) [Member] |  |
Available-for-sale securities: |  |
Mortgage servicing rights | $ 731 | $ 715

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