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EMPLOYEE BENEFIT PLANS (Assumptions Used) (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Qualified Plan |  |  |
Weighted Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate - benefit obligations | 2.78% | 2.36% |
Rate of compensation increase | 4.26% | 4.28% |
Discount rates: |  |  |
Effective rate for service cost | 2.40% | 2.94% | 4.24%
Effective rate for interest cost | 1.74% | 2.50% | 3.92%
Effective rate for interest on service cost | 1.92% | 2.59% | 4.00%
Cash balance interest credit rate | 1.57% | 2.19% | 3.34%
Expected long-term rate of return on plan assets | 5.25% | 5.75% | 6.00%
Rate of compensation increase | 4.28% | 4.28% | 4.55%
Supplemental Plan |  |  |
Weighted Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate - benefit obligations | 2.73% | 2.21% |
Rate of compensation increase | 4.50% | 4.50% |
Discount rates: |  |  |
Effective rate for service cost | 2.26% | 2.79% | 4.19%
Effective rate for interest cost | 1.53% | 2.33% | 3.83%
Effective rate for interest on service cost | 1.75% | 2.42% | 3.90%
Cash balance interest credit rate | 1.57% | 2.19% | 3.34%
Rate of compensation increase | 4.50% | 4.50% | 5.00%
Post-Retirement Medical Plan |  |  |
Weighted Average Assumptions Used to Determine Benefit Obligations |  |  |
Discount rate - benefit obligations | 2.46% | 1.90% |
Rate of compensation increase | 0.00% | 0.00% |
Discount rates: |  |  |
Effective rate for service cost | 2.35% | 2.86% | 4.21%
Effective rate for interest cost | 1.28% | 2.21% | 3.69%
Effective rate for interest on service cost | 2.11% | 2.68% | 4.09%

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate, Interest Cost + References No definition available. + Details
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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=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=123447040&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=123447040&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=123447040&loc=d3e2919-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + 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)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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