PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
SERPs
PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS
Interest cost	$ 112	$ 75	$ 336	$ 225
Amortization of net actuarial (gain) loss	(19)	20	(57)	62
Amortization of net transition obligation	2	5	6	13
Net periodic benefit cost	95	100	285	300
Pension Plan
PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS
Interest cost	0	0	0	212
Expected return on plan assets	0	0	0	(207)
Amortization of net actuarial loss	0	0	0	224
Settlement	0	0	0	4,884
Net periodic benefit cost	$ 0	$ 0	$ 0	$ 5,113

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

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