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RETIREMENT FUND AND PROFIT SHARING PLAN, SERP, Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember us-gaap:DefinedBenefitPlanTypeExtensibleList  
SERP [Member]    
Components of SERP expense [Abstract]    
Service cost $ 732 $ 700
Interest cost 664 673
Net amortization 443 375
Net periodic benefit cost $ 1,839 $ 1,748