OTHER BENEFIT PLANS (Additional Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of Other Benefit Plan [Line Items]
Potential Cash Payments Under Employment Agreements	$ 4,900,000
Directors’ Deferred Compensation and Cash Plans [Member]
Summary of Other Benefit Plan [Line Items]
Deferred Compensation Liability	3,600,000	$ 3,100,000
Deferred Compensation Arrangement with Individual, Compensation Expense	491,000	501,000	$ 469,000
Other Employee Benefit Plans [Member]
Summary of Other Benefit Plan [Line Items]
Deferred Compensation Expense	456,000	124,000	(63,000)
Deferred Compensation Liability	2,900,000	2,500,000	2,200,000
Retirement Benefits Plan 401k [Member]
Summary of Other Benefit Plan [Line Items]
Deferred Compensation Expense	$ 1,700,000	$ 1,600,000	$ 1,400,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	6.00%