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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Qualified Pension Plan |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost, benefits earned during the period | $ 0 | $ 0 | $ 0 | $ 0
Interest cost on projected benefit obligation | 378 | 397 | 756 | 793
Expected return on plan assets | (629) | (594) | (1,258) | (1,190)
Amortization of unrecognized transition obligation | 0 | 0 | 0 | 0
Amortization of unrecognized prior service cost | 0 | 0 | 0 | 0
Amortization of unrecognized net loss | 0 | 5 | 0 | 11
Net periodic pension benefit | (251) | (192) | (502) | (386)
Supplemental Pension Plan |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost, benefits earned during the period | 0 | 0 | 0 | 0
Interest cost on projected benefit obligation | 11 | 11 | 22 | 23
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of unrecognized prior service cost | 0 | 0 | 0 | 0
Amortization of unrecognized net loss | 3 | 2 | 6 | 4
Net periodic pension benefit | 14 | 13 | 28 | 27
Postretirement Plan, Medical and Life |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost, benefits earned during the period | 0 | 0 | 0 | 0
Interest cost on projected benefit obligation | 1 | 1 | 2 | 2
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of unrecognized prior service cost | 0 | 0 | 0 | 0
Amortization of unrecognized net loss | 4 | 4 | 8 | 9
Net periodic pension benefit | $ 5 | $ 5 | $ 10 | $ 11

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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