RETIREMENT PLANS (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Compensation and Retirement Disclosure [Abstract]
Employer contribution expense	$ 334	$ 361	$ 357
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	$ 105	115
Total annual expense	12	12	13
Supplemental discretionary deferred compensation plans
Defined Benefit Plan Disclosure [Line Items]
Total annual expense	15	30	25
Trust account balance	1,483	1,449
Supplemental retirement and salary continuation plans
Defined Benefit Plan Disclosure [Line Items]
Estimated present value of future benefits to be paid	5,662	5,211
Total annual expense	$ 727	626	575
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	$ 860	799
Total annual expense	$ 61	$ 129	$ 104