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EMPLOYEE RETIREMENT PLANS - Schedule of fair value hierarchy (Details) - Plan Assets [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | $ 43,144 | $ 41,036
Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 43,075 | 40,945
Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 19,390 | 17,490
Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 272 | 316
Exchange traded funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 6,033 | 5,213
Corporate obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 4,349 | 4,626
State and municipal obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 821 | 1,062
Pooled fixed income funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 7,117 | 7,598
U.S. government securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 763 | 364
Marketable CD's [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 513 | 806
Cash and cash equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 3,817 | 3,470
Other assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 69 | 91
Fair Value, Inputs, Level 1 [Member] | Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 34,406 | 32,032
Fair Value, Inputs, Level 1 [Member] | Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 17,194 | 15,464
Fair Value, Inputs, Level 1 [Member] | Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 245 | 287
Fair Value, Inputs, Level 1 [Member] | Exchange traded funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 6,033 | 5,213
Fair Value, Inputs, Level 1 [Member] | Corporate obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 1 [Member] | State and municipal obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Pooled fixed income funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 7,117 | 7,598
Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Marketable CD's [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 3,817 | 3,470
Fair Value, Inputs, Level 2 [Member] | Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 8,669 | 8,913
Fair Value, Inputs, Level 2 [Member] | Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 2,196 | 2,026
Fair Value, Inputs, Level 2 [Member] | Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 27 | 29
Fair Value, Inputs, Level 2 [Member] | Exchange traded funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Corporate obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 4,349 | 4,626
Fair Value, Inputs, Level 2 [Member] | State and municipal obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 821 | 1,062
Fair Value, Inputs, Level 2 [Member] | Pooled fixed income funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 763 | 364
Fair Value, Inputs, Level 2 [Member] | Marketable CD's [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 513 | 806
Fair Value, Inputs, Level 2 [Member] | Cash and cash equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Exchange traded funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Corporate obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | State and municipal obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Pooled fixed income funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | U.S. government securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Marketable CD's [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Cash and cash equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | $ 0 | $ 0

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- Definition Amount of investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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