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SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Net Periodic Benefit Cost) (Details) - SERPs - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS |  |
Interest cost | $ 108 | $ 112
Amortization of net actuarial (gain) loss | 0 | (19)
Amortization of net transition obligation | 0 | 2
Net periodic benefit cost | $ 108 | $ 95

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