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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | $ (20,559) | $ (21,648)
Other comprehensive loss before reclassification | 2,982 | 146
Amounts reclassified from accumulated other comprehensive income | 51 | 0
Net current period other comprehensive loss | (4) | 1
Ending balance | (17,530) | (21,501)
Unrealized Gains and Losses on Available-for- Sale Securities [Member] |  |
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | (20,768) | (21,715)
Other comprehensive loss before reclassification | 2,982 | 146
Amounts reclassified from accumulated other comprehensive income | 51 | 0
Net current period other comprehensive loss | 0 | 0
Ending balance | (17,735) | (21,569)
Defined Benefit Pension Items [Member] |  |
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | 209 | 67
Other comprehensive loss before reclassification | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Net current period other comprehensive loss | (4) | 1
Ending balance | $ 205 | $ 68

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