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RETIREMENT PLANS (Fair Value Measurements) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	$ 45,337	$ 44,292	$ 39,680
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	24,542	20,098
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	14,568	18,516
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	6,227	5,678
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	1,963	2,854
Level 1 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	0	0
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	0	0
Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	22,579	17,244
Level 2 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	14,568	18,516
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	6,227	5,678
Level 3 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	0	0
Level 3 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	0	0
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at measurement date	$ 0	$ 0

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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