ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification Adjustment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrealized gains and losses on available-for-sale securities
Net securities gains (losses)	$ 142	$ (50)	$ 32
Income tax expense	(30)	11	(13)
Net of tax	112	(39)	19
Amortization of defined benefit pension items
Salaries and employee benefits	(205)	(266)	(265)
Income tax expense	52	69	104
Net of tax	(153)	(197)	(161)
Total reclassifications for the period	$ (41)	$ (236)	$ (142)