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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | $ (21,648) | $ (17,346)
Other comprehensive income (loss) before reclassification | 947 | (4,574)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 122
Net current period other comprehensive income | 142 | 150
Ending balance | (20,559) | (21,648)
Unrealized Gains and Losses on Available-for- Sale Securities [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | (21,715) | (17,263)
Other comprehensive income (loss) before reclassification | 947 | (4,574)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 122
Net current period other comprehensive income | 0 | 0
Ending balance | (20,768) | (21,715)
Defined Benefit Pension Items [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | 67 | (83)
Other comprehensive income (loss) before reclassification | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Net current period other comprehensive income | 142 | 150
Ending balance | $ 209 | $ 67

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