EMPLOYEE BENEFITS - Share based payments in compensation expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Stock option and ESPP expense	$ 1,281	$ 1,676	$ 616
Nonvested share expense	4,116	3,076	6,059
Subtotal	5,397	4,752	6,675
Tax benefit	1,441	1,223	1,784
Stock-based compensation expense, net of tax benefit	$ 3,956	$ 3,529	$ 4,891