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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Statement of Comprehensive Income [Abstract] |  |
Unrealized appreciation (depreciation) on available-for-sale securities, tax | $ 378 | $ (1,824)
Reclassification adjustment for realized gains (losses) included in net income, tax | 0 | 49
Change in postretirement health plan gains and losses, net of taxes | $ 56 | $ 60

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