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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, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | $ (20,559) | $ (21,648)
Other comprehensive income (loss) before reclassification | 4,703 | (5,121)
Amounts reclassified from accumulated other comprehensive income (loss) | 51 |
Net current period other comprehensive income | (2) | 2
Ending balance | (15,807) | (26,767)
Unrealized Gains and Losses on Available-for- Sale Securities [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | (20,768) | (21,715)
Other comprehensive income (loss) before reclassification | 4,703 | (5,121)
Amounts reclassified from accumulated other comprehensive income (loss) | 51 |
Net current period other comprehensive income | 0 | 0
Ending balance | (16,014) | (26,836)
Defined Benefit Pension Items [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | 209 | 67
Other comprehensive income (loss) before reclassification | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 |
Net current period other comprehensive income | (2) | 2
Ending balance | $ 207 | $ 69

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