LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Recorded Investment
Total	$ 13,972,000		$ 13,972,000		$ 12,954,000
Unpaid Principal Balance
Total	18,447,000		18,447,000		16,081,000
Related Allowance
With an allowance recorded	2,000		2,000
Total					1,000
Average Recorded Investment
Total	13,850,000	$ 13,225,000	13,593,000	$ 14,627,000
Interest Income Recognized
Total	97,000	108,000	262,000	393,000
Commercial and Industrial [Member]
Recorded Investment
With no related allowance recorded	1,101,000		1,101,000		1,084,000
With an allowance recorded	0		0		0
Total	1,101,000		1,101,000		1,084,000
Unpaid Principal Balance
With no related allowance recorded	1,101,000		1,101,000		1,084,000
With an allowance recorded	0		0		0
Total	1,101,000		1,101,000		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	1,080,000	1,101,000	1,076,000	1,111,000
With an allowance recorded	0	0	0	0
Total	1,080,000	1,101,000	1,076,000	1,111,000
Interest Income Recognized
With no related allowance recorded	4,000	13,000	12,000	40,000
With an allowance recorded	0	0	0	0
Total	4,000	13,000	12,000	40,000
Commercial Real Estate [Member]
Recorded Investment
With no related allowance recorded	11,747,000		11,747,000		11,130,000
With an allowance recorded	28,000		28,000		28,000
Total	11,775,000		11,775,000		11,158,000
Unpaid Principal Balance
With no related allowance recorded	15,947,000		15,947,000		14,147,000
With an allowance recorded	50,000		50,000		28,000
Total	15,997,000		15,997,000		14,175,000
Related Allowance
With no related allowance recorded	0		0		0
With an allowance recorded	1,000		1,000		1,000
Total	1,000		1,000		1,000
Average Recorded Investment
With no related allowance recorded	11,640,000	11,167,000	11,361,000	12,842,000
With an allowance recorded	29,000	131,000	119,000	83,000
Total	11,669,000	11,298,000	11,480,000	12,925,000
Interest Income Recognized
With no related allowance recorded	93,000	91,000	243,000	343,000
With an allowance recorded	0	2,000	5,000	3,000
Total	93,000	93,000	248,000	346,000
Residential Real Estate [Member]
Recorded Investment
With no related allowance recorded	1,071,000		1,071,000		712,000
With an allowance recorded	25,000		25,000		0
Total	1,096,000		1,096,000		712,000
Unpaid Principal Balance
With no related allowance recorded	1,289,000		1,289,000		822,000
With an allowance recorded	60,000		60,000		0
Total	1,349,000		1,349,000		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	1,076,000	826,000	1,015,000	573,000
With an allowance recorded	25,000	0	22,000	18,000
Total	1,101,000	826,000	1,037,000	591,000
Interest Income Recognized
With no related allowance recorded	0	2,000	1,000	7,000
With an allowance recorded	0	0	1,000	0
Total	$ 0	$ 2,000	$ 2,000	$ 7,000