LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring (Details)	9 Months Ended
	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 loan	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Period of current payment history	6 months
Number of projected future quarters under review	1 year
TDR loans	$ 20,200,000		$ 21,200,000
Performing TDRs	19,900,000		20,900,000
Nonperforming TDRs	290,000		277,000
Allowances for performing TDRs	$ 323,000		457,000
Allowance for nonperforming TDRs			$ 0
Number of loans modified as TDRs | loan	0	0
Subsequent default, number of contracts | loan		0