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RETIREMENT PLANS (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
plan
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Employer contribution expense $ 479 $ 432 $ 334
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 $ 9 11 12
Estimated present value of future benefits to be paid 82 94  
Supplemental discretionary deferred compensation plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan expense 61 10 15
Trust account balance 1,692 1,571  
Supplemental retirement and salary continuation plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan expense $ 872 739 727
Number of supplemental retirement and salary continuation plans | plan 2    
Estimated present value of future benefits to be paid $ 8,548 6,109  
Life insurance coverage post-retirement      
Defined Benefit Plan Disclosure [Line Items]      
Plan expense 126 77 $ 61
Estimated present value of future benefits to be paid $ 1,457 $ 937