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RETIREMENT PLANS (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan participant age required | 18 years |  |
Plan participant service requirement, period | 1 month |  |
Maximum annual contributions per employee | $ 57 |  |
Maximum annual contributions per employee, percent | 100.00% |  |
Employer matching contribution, percent of match of base contribution by employee | 0.50 |  |
Employer matching contribution, percent of employee contribution | 6.00% |  |
Employer contribution expense | $ 626 | $ 590 | $ 479
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 | $ 53 | 68 |
Plan expense | 7 | 8 | 9
Supplemental discretionary deferred compensation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan expense | 61 |  |
Trust account balance | 2,500 | 1,800 |
Supplemental retirement and salary continuation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | 11,400 | 10,600 |
Plan expense | $ 1,500 | 1,000 | 872
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 | $ 1,500 |  |
Plan expense | $ 25 | $ 22 | $ 126

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