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RETIREMENT PLANS (Detail) | 12 Months Ended
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Dec. 31, 2023 USD ($) plan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan participant service requirement, period | 1 month |  |
Plan participant age required | 18 years |  |
Maximum annual contributions per employee | $ 66,000 |  |
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 | $ 859,000 | $ 780,000 | $ 669,000
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 | $ 0 | 18,000 |
Plan expense | 2,000 | 4,000 | 5,000
Supplemental discretionary deferred compensation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan expense | 51,000 | 51,000 | 61,000
Trust account balance | 2,200,000 | 2,000,000 |
Supplemental retirement and salary continuation plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated present value of future benefits to be paid | 14,900,000 | 13,600,000 |
Plan expense | $ 1,900,000 | 2,000,000 | 1,700,000
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 | $ 1,800,000 | 1,700,000 |
Plan expense | $ 130,000 | $ 105,000 | $ 104,000

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