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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Unrealized appreciation (depreciation) on available-for-sale securities, tax | $ 705 | $ 718 | $ 852 | $ 1,380
Reclassification adjustment for realized gains included in net income, tax | 42 | 0 | 40 | 0
Postretirement health plan amortization of transition obligation and prior service cost and change in net loss, tax | $ 1 | $ 2 | $ 5 | $ 5

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