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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]        
Unrealized appreciation (depreciation) on available-for-sale securities, tax $ 3,515 $ 1,025 $ 4,500 $ 1,078
Reclassification adjustment for realized gains included in net income, Tax 0 33 0 91
Postretirement health plan amortization of transition obligation and prior service cost and change in net loss, tax $ 4 $ 3 $ 10 $ 6