LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructures (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) item	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) item
Loans past due
Accruing	$ 2,969,000		$ 2,969,000		$ 3,298,000
Nonaccrual	511,000		511,000		13,000
Total	3,480,000		3,480,000		3,311,000
Specific reserve	342,000		342,000		523,000
Charge offs	0	$ 0	0	$ 0
Commercial real estate
Loans past due
Accruing	2,969,000		2,969,000		3,298,000
Nonaccrual	482,000		482,000
Total	3,451,000		3,451,000		$ 3,298,000
Amount of loan defaulted	0	$ 0	$ 482,000	$ 0
Number of loans modified | item			1		1
Total recorded investment			$ 640,000		$ 503,000
Commercial and industrial
Loans past due
Nonaccrual	29,000		29,000		13,000
Total	$ 29,000		$ 29,000		$ 13,000
Number of loans modified | item			1
Total recorded investment			$ 640,000