LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired loans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Recorded Investment
Total	$ 13,700,000		$ 13,700,000		$ 12,954,000
Unpaid Principal Balance
Total	16,693,000		16,693,000		16,081,000
Related Allowance
With an allowance recorded	4,000		4,000
Total					1,000
Average Recorded Investment
Total	13,693,000	$ 13,470,000	13,462,000	$ 15,339,000
Interest Income Recognized
Total	81,000	119,000	165,000	285,000
Commercial and Industrial [Member]
Recorded Investment
With no related allowance recorded	1,062,000		1,062,000		1,084,000
With an allowance recorded	0		0		0
Total	1,062,000		1,062,000		1,084,000
Unpaid Principal Balance
With no related allowance recorded	1,062,000		1,062,000		1,084,000
With an allowance recorded	0		0		0
Total	1,062,000		1,062,000		1,084,000
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	1,068,000	1,111,000	1,074,000	1,116,000
With an allowance recorded	0	0	0	0
Total	1,068,000	1,111,000	1,074,000	1,116,000
Interest Income Recognized
With no related allowance recorded	2,000	13,000	8,000	27,000
With an allowance recorded	0	0	0	0
Total	2,000	13,000	8,000	27,000
Commercial Real Estate [Member]
Recorded Investment
With no related allowance recorded	11,316,000		11,316,000		11,130,000
With an allowance recorded	215,000		215,000		28,000
Total	11,531,000		11,531,000		11,158,000
Unpaid Principal Balance
With no related allowance recorded	14,224,000		14,224,000		14,147,000
With an allowance recorded	215,000		215,000		28,000
Total	14,439,000		14,439,000		14,175,000
Related Allowance
With no related allowance recorded	0		0		0
With an allowance recorded	3,000		3,000		1,000
Total	3,000		3,000		1,000
Average Recorded Investment
With no related allowance recorded	11,300,000	11,856,000	11,217,000	13,700,000
With an allowance recorded	217,000	0	166,000	51,000
Total	11,517,000	11,856,000	11,383,000	13,751,000
Interest Income Recognized
With no related allowance recorded	75,000	102,000	151,000	252,000
With an allowance recorded	3,000	0	4,000	1,000
Total	78,000	102,000	155,000	253,000
Residential Real Estate [Member]
Recorded Investment
With no related allowance recorded	1,087,000		1,087,000		712,000
With an allowance recorded	20,000		20,000		0
Total	1,107,000		1,107,000		712,000
Unpaid Principal Balance
With no related allowance recorded	1,172,000		1,172,000		822,000
With an allowance recorded	20,000		20,000		0
Total	1,192,000		1,192,000		822,000
Related Allowance
With no related allowance recorded	0		0		0
With an allowance recorded	1,000		1,000		0
Total	1,000		1,000		$ 0
Average Recorded Investment
With no related allowance recorded	1,088,000	447,000	984,000	444,000
With an allowance recorded	20,000	56,000	21,000	28,000
Total	1,108,000	503,000	1,005,000	472,000
Interest Income Recognized
With no related allowance recorded	0	4,000	0	5,000
With an allowance recorded	1,000	0	2,000	0
Total	$ 1,000	$ 4,000	$ 2,000	$ 5,000