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EMPLOYEE BENEFITS - Net Periodic Benefit Cost and Postretirement Benefit Cost (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Pension Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 1,398,000 $ 1,375,000 $ 1,838,000
Interest cost 3,601,000 3,731,000 3,410,000
Expected return on assets (6,050,000) (5,224,000) (5,684,000)
Net loss amortization 1,312,000 1,642,000 1,505,000
Prior service cost (credit) amortization (14,000) (14,000) (23,000)
Special and contractual termination benefits 0 1,549,000 176,000
Loss (gain) recognized due to settlement 0 0 0
Net periodic benefit cost 247,000 3,059,000 1,222,000
Defined Benefit Pension Plan Acquired      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0 0 0
Interest cost 177,000 212,000 238,000
Expected return on assets (212,000) (265,000) (294,000)
Net loss amortization 0 0 0
Prior service cost (credit) amortization 0 0 0
Special and contractual termination benefits 0 0 0
Loss (gain) recognized due to settlement 8,000 (8,000) (62,000)
Net periodic benefit cost (27,000) (61,000) (118,000)
Restoration Plan      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 247,000 207,000 334,000
Interest cost 567,000 535,000 668,000
Net loss amortization 301,000 186,000 943,000
Prior service cost (credit) amortization 6,000 6,000 7,000
Special and contractual termination benefits 0 0 0
Loss (gain) recognized due to settlement 0 0 0
Net periodic benefit cost $ 1,121,000 $ 934,000 $ 1,952,000