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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Statement of Comprehensive Income [Abstract] |  |  |  |
Unrealized Gain (Loss) on Available-for-Sale Securities, tax benefit (expense) | $ 71 | $ 16 | $ 74 | $ (5)
Pension and Other Postretirement Benefits, net of tax benefit | $ 10 | $ 9 | $ 36 | $ 19

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