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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, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | $ (20,559) | $ (21,648)
Other comprehensive income (loss) before reclassification | 4,176 | 947
Amounts reclassified from accumulated other comprehensive income (loss) | 51 | 0
Net current period other comprehensive income | 68 | 142
Ending balance | (16,264) | (20,559)
Unrealized Gains and Losses on Available-for- Sale Securities [Member] |  |
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | (20,768) | (21,715)
Other comprehensive income (loss) before reclassification | 4,176 | 947
Amounts reclassified from accumulated other comprehensive income (loss) | 51 | 0
Net current period other comprehensive income | 0 | 0
Ending balance | (16,541) | (20,768)
Defined Benefit Pension Items [Member] |  |
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | 209 | 67
Other comprehensive income (loss) before reclassification | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Net current period other comprehensive income | 68 | 142
Ending balance | $ 277 | $ 209

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