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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]        
Unrealized appreciation (depreciation) on available-for-sale securities, tax $ 1,683 $ 2,706 $ 192 $ 664
Reclassification adjustment for realized gains (losses) included in net income, tax     20 0
Change in postretirement health plan gains and losses, net of taxes $ 1 $ 0 $ 1 $ 1