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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Statement of Comprehensive Income [Abstract] |  |  |  |
Unrealized Gain on Available-for-Sale Securities, tax expense | $ (5) | $ (331) | $ (71) | $ (255)
Pension and Other Postretirement Benefits, net of tax benefit (expense) | $ 4 | $ 11 | $ 12 | $ 47

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