FAIR VALUE - Summary of assets measured at fair value on Non recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	$ 658	$ 658	$ 658
Impaired loans	795	795	1,113
Other real estate owned, gross			2,400
Other real estate owned valuation allowance			1,700
Impaired loans carrying value	1,835	1,835	1,835	$ 1,889
Allowance for loans	7,100	7,100	7,287
Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658	658	658
Impaired loans	795	795	1,113
Level 3
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans carrying value	1,800	1,800	1,800
Allowance for loans	1,000	1,000	700
Provision for loan losses	300	300
Level 3 | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658	658	658
Impaired loans	795	795	1,113
Commercial properties | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658	658	658
Commercial properties | Level 3 | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Other real estate owned	658	658	658
Commercial and Industrial | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	795	795	1,113
Commercial and Industrial | Level 3 | Nonrecurring
Summary of assets measured on a recurring and nonrecurring basis
Impaired loans	$ 795	$ 795	$ 1,113