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RETIREMENT FUND AND PROFIT SHARING PLAN, SERP (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
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 | $ 183 | $ 175 | $ 366 | $ 350 |
Interest cost | 166 | 168 | 332 | 337 |
Net amortization | 111 | 94 | 222 | 187 |
Net periodic benefit cost | 460 | $ 437 | 920 | $ 874 |
Amounts recognized in accumulated other comprehensive loss, pretax [Abstract] |  |  |  |  |
Prior service cost | 1,007 |  | 1,007 |  | $ 1,135
Net loss | 3,638 |  | 3,638 |  | 3,732
Total amounts recognized in accumulated other comprehensive loss | $ 4,645 |  | $ 4,645 |  | $ 4,867

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