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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]        
Unrealized appreciation (depreciation) on available-for-sale securities, tax $ 874 $ (3,515) $ (649) $ (4,500)
Reclassification adjustment for realized gains (losses) included in net income, tax 4 0 (48) 0
Postretirement health plan amortization of transition obligation and prior service cost and change in net loss, tax $ 0 $ (4) $ (1) $ (10)