RETIREMENT PLANS (Detail) $ in Thousands	12 Months Ended
	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