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RETIREMENT FUND AND PROFIT SHARING PLAN, SERP (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Type [Extensible List] | us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember |  | us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |
SERP [Member] |  |  |  |  |
Components of SERP expense [Abstract] |  |  |  |  |
Service cost | $ 144 | $ 183 | $ 288 | $ 366 |
Interest cost | 185 | 166 | 370 | 332 |
Net amortization | 48 | 111 | 96 | 222 |
Net periodic benefit cost | 377 | $ 460 | 754 | $ 920 |
Amounts recognized in accumulated other comprehensive loss, net of tax [Abstract] |  |  |  |  |
Prior service cost | 828 |  | 828 |  | $ 918
Net loss | 1,971 |  | 1,971 |  | 1,977
Total amounts recognized in accumulated other comprehensive loss | $ 2,799 |  | $ 2,799 |  | $ 2,895

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