STOCK PLANS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Compensation Related Costs Share Based Payments [Line Items]
Common stock, par value	$ 1	$ 1
Restricted stock expense	$ 2,352	$ 1,661	$ 1,154
Restricted stock award vested percent	100.00%
Vesting period for recognition of compensation costs	5 years
Compensation cost	$ 2,300	$ 1,700	1,200
2007 Stock Incentive Plan
Compensation Related Costs Share Based Payments [Line Items]
Issuance of common stock	315,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	564,149
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 4,800
Common Stock
Compensation Related Costs Share Based Payments [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Gross	78,189	89,315
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 3,200	$ 240	$ 90
Two Thousand Seven Plan [Member]
Compensation Related Costs Share Based Payments [Line Items]
Issuance of common stock	500,000			300,000
Common stock, par value	$ 1.00
Two Thousand Seven Plan Amendment [Member]
Compensation Related Costs Share Based Payments [Line Items]
Issuance of common stock	1,115,000			615,000
Common stock, par value	$ 1.00			$ 1.00