ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification Adjustment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Unrealized gains and losses on available-for-sale securities
Net securities gains (losses)	$ 6	$ 0	$ 94	$ (6)
Income tax expense	0	0	0	0
Net of tax	6	0	94	(6)
Amortization of defined benefit pension items
Other expense	(51)	(67)	(154)	(200)
Income tax expense	13	17	38	52
Net of tax	(38)	(50)	(116)	(148)
Total reclassifications of Net income for the period	$ (32)	$ (50)	$ (22)	$ (154)