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RETIREMENT PLANS (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) plan | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Compensation and Retirement Disclosure [Abstract] |  |  |
Employer contribution expense | $ 334 | $ 361 | $ 357
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 | $ 105 | 115 |
Total annual expense | 12 | 12 | 13
Supplemental discretionary deferred compensation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total annual expense | 15 | 30 | 25
Trust account balance | 1,483 | 1,449 |
Supplemental retirement and salary continuation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | 5,662 | 5,211 |
Total annual expense | $ 727 | 626 | 575
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 | $ 860 | 799 |
Total annual expense | $ 61 | $ 129 | $ 104

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