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EMPLOYEE RETIREMENT PLANS - Schedule of fair value hierarchy (Details) - Plan Assets [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | $ 41,036 | $ 37,353
Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 40,945 | 37,247
Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 17,490 | 15,160
Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 316 | 307
Exchange traded funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 5,213 | 4,454
Corporate obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 4,626 | 4,568
State and municipal obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 1,062 | 1,046
Pooled fixed income funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 7,598 | 7,767
U.S. government securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 364 | 286
Marketable CD's [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 806 | 911
Cash and cash equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 3,470 | 2,748
Other assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 91 | 106
Fair Value, Inputs, Level 1 [Member] | Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 32,032 | 28,804
Fair Value, Inputs, Level 1 [Member] | Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 15,464 | 13,556
Fair Value, Inputs, Level 1 [Member] | Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 287 | 279
Fair Value, Inputs, Level 1 [Member] | Exchange traded funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 5,213 | 4,454
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 | 7,598 | 7,767
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 | 3,470 | 2,748
Fair Value, Inputs, Level 2 [Member] | Subtotal [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 8,913 | 8,443
Fair Value, Inputs, Level 2 [Member] | Common stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 2,026 | 1,604
Fair Value, Inputs, Level 2 [Member] | Preferred stocks [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 29 | 28
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 | 4,626 | 4,568
Fair Value, Inputs, Level 2 [Member] | State and municipal obligations [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 1,062 | 1,046
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 | 364 | 286
Fair Value, Inputs, Level 2 [Member] | Marketable CD's [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair Value of Pension Plan Assets, Total | 806 | 911
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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