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EMPLOYEE BENEFIT PLANS - Assumptions (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net periodic pension cost |  |  |
Transfer into Level 3, Asset | $ 0 | $ 0 |
Transfer out of Level 3, Asset | 0 | 0 |
Transfer into level 3, Liability | 0 | 0 |
Transfer out of level 3, Liability | $ 0 | $ 0 |
Pension Plans |  |  |
Projected benefit obligation |  |  |
Discount rate, obligation | 2.46% | 3.23% |
Net periodic pension cost |  |  |
Discount rate, periodic cost | 3.23% | 4.23% |
Long-term rate of return on plan assets | 6.00% | 6.50% |
Pension Plans | Common stock |  |  |
Net periodic pension cost |  |  |
Target asset allocation | 54.00% |  |
Pension Plans | Fixed-income securities |  |  |
Net periodic pension cost |  |  |
Target asset allocation | 46.00% |  |
Non-qualified Supplemental Executive Retirement Plan |  |  |
Projected benefit obligation |  |  |
Discount rate, obligation | 1.56% | 2.65% | 3.83%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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