OTHER ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of the COLI	$ 12,300	$ 10,900
Increase (decrease) in cash surrender value	1,300	500	$ (100)
Proceeds from sale of marketable securities	0	2,164	2,820
Investments held in Rabbi Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of investments	1,300	1,000
Fair value of investments	1,500	1,700
Unrealized gain on investments	200	700
Proceeds from sale of marketable securities		2,200
Supplemental Employee Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	19,134	16,900	$ 15,576
Value of assets earmarked for SERP use but not restricted to that use	$ 14,000	12,700
Proceeds from sale of marketable securities		$ 2,200