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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, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | $ (21,648) | $ (17,346)
Other comprehensive (loss) income before reclassification | (5,121) | (5,688)
Net current period other comprehensive (loss) income | 2 | (1)
Ending balance | (26,767) | (23,035)
Unrealized Gains and Losses on Available-for- Sale Securities [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | (21,715) | (17,263)
Other comprehensive (loss) income before reclassification | (5,121) | (5,688)
Net current period other comprehensive (loss) income | 0 | 0
Ending balance | (26,836) | (22,951)
Defined Benefit Pension Items [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | 67 | (83)
Other comprehensive (loss) income before reclassification | 0 | 0
Net current period other comprehensive (loss) income | 2 | (1)
Ending balance | $ 69 | $ (84)

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