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OTHER BENEFIT PLANS (Additional Information) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Other Benefit Plan [Line Items] |  |  |
Potential Cash Payments Under Employment Agreements | $ 5,300,000 |  |
Directors' Deferred Compensation and Cash Plans [Member] |  |  |
Summary of Other Benefit Plan [Line Items] |  |  |
Deferred Compensation Liability | 4,000,000 | $ 3,600,000 |
Deferred Compensation Arrangement with Individual, Compensation Expense | 703,000 | 491,000 | $ 501,000
Other Employee Benefit Plans [Member] |  |  |
Summary of Other Benefit Plan [Line Items] |  |  |
Deferred Compensation Expense | (31,000) | 456,000 | 124,000
Deferred Compensation Liability | 3,300,000 | 2,900,000 | 2,500,000
Retirement Benefits Plan 401k [Member] |  |  |
Summary of Other Benefit Plan [Line Items] |  |  |
Deferred Compensation Expense | $ 1,800,000 | $ 1,700,000 | $ 1,600,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00% |  |

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