LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in the allowance for loan losses
Balance at beginning of period	$ 9,878	$ 9,101	$ 8,006
Charge-offs	(1,480)	(1,497)	(2,557)
Recoveries	101	101	20
Provision	2,440	2,173	3,632
Balance at end of period	10,939	9,878	9,101
Individually evaluated for impairment	1,043	1,188	543
Collectively evaluated for impairment	9,896	8,690	8,558
Commercial
Changes in the allowance for loan losses
Balance at beginning of period	7,804	7,181	6,066
Charge-offs	(1,024)	(1,138)	(1,995)
Recoveries	15	39	8
Provision	1,810	1,722	3,102
Balance at end of period	8,605	7,804	7,181
Individually evaluated for impairment	1,043	1,172	376
Collectively evaluated for impairment	7,562	6,632	6,805
Residential
Changes in the allowance for loan losses
Balance at beginning of period	1,119	990	1,095
Charge-offs	(166)	(141)	(124)
Recoveries	22	40	2
Provision	430	230	17
Balance at end of period	1,405	1,119	990
Individually evaluated for impairment	0	0	122
Collectively evaluated for impairment	1,405	1,119	868
Home Equity
Changes in the allowance for loan losses
Balance at beginning of period	705	728	715
Charge-offs	0	(109)	(100)
Recoveries	59	4	9
Provision	(80)	82	104
Balance at end of period	684	705	728
Individually evaluated for impairment	0	0	36
Collectively evaluated for impairment	684	705	692
Consumer
Changes in the allowance for loan losses
Balance at beginning of period	250	202	130
Charge-offs	(290)	(109)	(338)
Recoveries	5	18	1
Provision	280	139	409
Balance at end of period	245	250	202
Individually evaluated for impairment	0	16	9
Collectively evaluated for impairment	$ 245	$ 234	$ 193