LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Recorded Investment
Total	$ 13,272		$ 13,272		$ 17,593
Unpaid Principal Balance
Total	16,357		16,357		21,935
Related Allowance
Total	3		3		1
Average Recorded Investment
Total	13,470	$ 13,844	15,339	$ 13,886
Interest Income Recognized
Total	119	112	285	218
Commercial and Industrial [Member]
Recorded Investment
With no related allowance recorded	1,105		1,105		1,126
With an allowance recorded	0		0		0
Total	1,105		1,105		1,126
Unpaid Principal Balance
With no related allowance recorded	1,105		1,105		1,126
With an allowance recorded	0		0		0
Total	1,105		1,105		1,126
Related Allowance
With no related allowance recorded	0		0		0
With an allowance recorded	0		0		0
Total	0		0		0
Average Recorded Investment
With no related allowance recorded	1,111	1,180	1,116	1,188
With an allowance recorded	0	0	0	0
Total	1,111	1,180	1,116	1,188
Interest Income Recognized
With no related allowance recorded	13	5	27	9
With an allowance recorded	0	0	0	0
Total	13	5	27	9
Commercial Real Estate [Member]
Recorded Investment
With no related allowance recorded	11,333		11,333		15,807
With an allowance recorded	0		0		83
Total	11,333		11,333		15,890
Unpaid Principal Balance
With no related allowance recorded	14,350		14,350		20,107
With an allowance recorded	0		0		83
Total	14,350		14,350		20,190
Related Allowance
With no related allowance recorded	0		0		0
With an allowance recorded	0		0		1
Total	0		0		1
Average Recorded Investment
With no related allowance recorded	11,856	11,530	13,700	10,478
With an allowance recorded	0	51	51	1,179
Total	11,856	11,581	13,751	11,657
Interest Income Recognized
With no related allowance recorded	102	105	252	206
With an allowance recorded	0	1	1	1
Total	102	106	253	207
Residential Portfolio Segment [Member]
Recorded Investment
With no related allowance recorded	778		778		577
With an allowance recorded	56		56		0
Total	834		834		577
Unpaid Principal Balance
With no related allowance recorded	840		840		619
With an allowance recorded	62		62		0
Total	902		902		619
Related Allowance
With no related allowance recorded	0		0		0
With an allowance recorded	3		3		0
Total	3		3		$ 0
Average Recorded Investment
With no related allowance recorded	447	898	444	914
With an allowance recorded	56	185	28	127
Total	503	1,083	472	1,041
Interest Income Recognized
With no related allowance recorded	4	1	5	2
With an allowance recorded	0	0	0	0
Total	$ 4	$ 1	$ 5	$ 2