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RETIREMENT PLANS (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) plan | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum annual contributions per employee | $ 53 |  |
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 | $ 590 | $ 479 | $ 432
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 |  |
Plan expense | $ 8 | 9 | 11
Estimated present value of future benefits to be paid | 68 | 82 |
Supplemental discretionary deferred compensation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan expense | 61 | 61 | 10
Trust account balance | 1,800 | 1,700 |
Supplemental retirement and salary continuation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan expense | $ 1,000 | 872 | 739
Number of supplemental retirement and salary continuation plans | plan | 2 |  |
Estimated present value of future benefits to be paid | $ 10,600 | 8,500 |
Life insurance coverage post-retirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan expense | 22 | 126 | $ 77
Estimated present value of future benefits to be paid | $ 1,500 | $ 1,500 |

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