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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | $ (16,264) | $ (20,559)
Other comprehensive income before reclassification | 1,713 | 4,703
Amounts reclassified from accumulated other comprehensive loss | 82 | 51
Net current period other comprehensive income (loss) | 1 | (2)
Ending balance | (14,468) | (15,807)
Unrealized Gains and Losses on Available-for- Sale Securities [Member] |  |
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | (16,541) | (20,768)
Other comprehensive income before reclassification | 1,713 | 4,703
Amounts reclassified from accumulated other comprehensive loss | 82 | 51
Net current period other comprehensive income (loss) | 0 | 0
Ending balance | (14,746) | (16,014)
Defined Benefit Pension Items [Member] |  |
Accumulated Other Comprehensive Loss [Line Items] |  |
Beginning balance | 277 | 209
Other comprehensive income before reclassification | 0 | 0
Amounts reclassified from accumulated other comprehensive loss | 0 | 0
Net current period other comprehensive income (loss) | 1 | (2)
Ending balance | $ 278 | $ 207

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