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RETIREMENT PLANS (Detail)
$ in Thousands
12 Months Ended
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