FAIR VALUE - Summary of assets measured at fair value on Non recurring basis (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	$ 658,000	$ 658,000	$ 658,000
Impaired loans	795,000	795,000	1,113,000
Other real estate owned, gross			2,400,000
Other real estate owned valuation allowance			1,700,000
Impaired loans carrying value	1,835,000	1,835,000	1,835,000	$ 1,868,000
Allowance for loans	7,118,000	7,118,000	7,287,000
Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658,000	658,000	658,000
Impaired loans	795,000	795,000	1,113,000
Level 3
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans carrying value	13,100,000	13,100,000	1,800,000
Allowance for loans	1,000,000	1,000,000	700,000
Provision for loan losses	0	300,000
Level 3 | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658,000	658,000	658,000
Impaired loans	795,000	795,000	1,113,000
Commercial properties | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658,000	658,000	658,000
Commercial properties | Level 3 | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658,000	658,000	658,000
Commercial and Industrial | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	795,000	795,000	1,113,000
Commercial and Industrial | Level 3 | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	$ 795,000	$ 795,000	$ 1,113,000