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EMPLOYEE BENEFIT PLANS - Components of net periodic cost (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
EMPLOYEE BENEFIT PLANS
Settlement loss		$ (647)
Retirement Income Plan
EMPLOYEE BENEFIT PLANS
Service cost for benefits earned during the period	$ 0	0	$ 0
Interest cost	147	230	255
Expected return on plan assets	(289)	(292)	(468)
Amortization of net losses	73	98	87
Settlement loss		(647)
Net periodic (benefit) cost	$ (69)	$ 683	$ (126)

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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