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RETIREMENT PLANS (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Retirement Benefits [Abstract] |  |  |
Employer contribution expense | $ 432 | $ 334 | $ 361
Deferred compensation arrangement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Age at which a director or his beneficiaries will receive a monthly retirement benefit | 65 years |  |
Estimated present value of future benefits to be paid | $ 94 | 105 |
Plan expense | 11 | 12 | 12
Supplemental discretionary deferred compensation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan expense | 10 | 15 | 30
Trust account balance | 1,571 | 1,483 |
Supplemental retirement and salary continuation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | 6,109 | 5,662 |
Plan expense | $ 739 | 727 | 626
Number of supplemental retirement and salary continuation plans | plan | 2 |  |
Life insurance coverage post-retirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | $ 937 | 860 |
Plan expense | $ 77 | $ 61 | $ 129

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