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PENSION AND OTHER POSTRETIREMENT PLANS (Schedule of Fair Values of Pension Plan and Postretirement Plan Assets by Asset Category) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | $ 2,346,000 | $ 2,470,000
SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 878,000 | 913,000
Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 2,346,000 | 2,470,000
Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 878,000 | 913,000
Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Accrued Interest and Dividend Income | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 3,000 | 2,000
Accrued Interest and Dividend Income | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 1,000 | 1,000
Equity securities - US mid cap stock mutual funds [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 124,000 | 115,000
Equity securities - US mid cap stock mutual funds [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 23,000 | 46,000
Equity securities - US mid cap stock mutual funds [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 124,000 | 115,000
Equity securities - US mid cap stock mutual funds [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 23,000 | 46,000
Equity securities - US mid cap stock mutual funds [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US mid cap stock mutual funds [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US mid cap stock mutual funds [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US mid cap stock mutual funds [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US large cap common stocks [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 962,000 | 912,000
Equity securities - US large cap common stocks [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 360,000 | 353,000
Equity securities - US large cap common stocks [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 962,000 | 912,000
Equity securities - US large cap common stocks [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 360,000 | 353,000
Equity securities - US large cap common stocks [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US large cap common stocks [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US large cap common stocks [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US large cap common stocks [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Cash - money market account [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 93,000 | 74,000
Cash - money market account [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 16,000 | 13,000
Cash - money market account [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 93,000 | 74,000
Cash - money market account [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 16,000 | 13,000
Cash - money market account [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Cash - money market account [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Cash - money market account [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Cash - money market account [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - short term bond mutual funds [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 205,000 | 480,000
Debt securities - short term bond mutual funds [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 82,000 | 155,000
Debt securities - short term bond mutual funds [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 205,000 | 480,000
Debt securities - short term bond mutual funds [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 82,000 | 155,000
Debt securities - short term bond mutual funds [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - short term bond mutual funds [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - short term bond mutual funds [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - short term bond mutual funds [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - intermediate term bond mutual funds [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 526,000 | 402,000
Debt securities - intermediate term bond mutual funds [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 216,000 | 156,000
Debt securities - intermediate term bond mutual funds [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 526,000 | 402,000
Debt securities - intermediate term bond mutual funds [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 216,000 | 156,000
Debt securities - intermediate term bond mutual funds [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - intermediate term bond mutual funds [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - intermediate term bond mutual funds [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Debt securities - intermediate term bond mutual funds [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity Securities - emerging markets stock mutual funds [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 105,000 | 111,000
Equity Securities - emerging markets stock mutual funds [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 37,000 | 43,000
Equity Securities - emerging markets stock mutual funds [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 105,000 | 111,000
Equity Securities - emerging markets stock mutual funds [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 37,000 | 43,000
Equity Securities - emerging markets stock mutual funds [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity Securities - emerging markets stock mutual funds [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity Securities - emerging markets stock mutual funds [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity Securities - emerging markets stock mutual funds [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - international stock mutual funds [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 202,000 | 257,000
Equity securities - international stock mutual funds [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 72,000 | 100,000
Equity securities - international stock mutual funds [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 202,000 | 257,000
Equity securities - international stock mutual funds [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 72,000 | 100,000
Equity securities - international stock mutual funds [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - international stock mutual funds [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - international stock mutual funds [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - international stock mutual funds [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US small cap stock mutual funds [Member] | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 129,000 | 119,000
Equity securities - US small cap stock mutual funds [Member] | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 72,000 | 47,000
Equity securities - US small cap stock mutual funds [Member] | Level 1 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 129,000 | 119,000
Equity securities - US small cap stock mutual funds [Member] | Level 1 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 72,000 | 47,000
Equity securities - US small cap stock mutual funds [Member] | Level 2 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US small cap stock mutual funds [Member] | Level 2 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US small cap stock mutual funds [Member] | Level 3 | Pension Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 | 0
Equity securities - US small cap stock mutual funds [Member] | Level 3 | SERP Benefits |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Assets for Plan Benefits | $ 0 | $ 0

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