ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification Adjustment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrealized gains and losses on available-for-sale securities
Net securities gains (losses)	$ 433	$ 142	$ (50)
Income tax expense	(91)	(30)	11
Net of tax	342	112	(39)
Amortization of defined benefit pension items
Salaries and employee benefits	(251)	(205)	(266)
Income tax expense	63	52	69
Net of tax	(188)	(153)	(197)
Total reclassifications of Net income for the period	$ 154	$ (41)	$ (236)