LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Summary of unpaid principal balance of loans classified as TDRs (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment With Allowance	$ 1,835	$ 1,868	$ 1,835	$ 1,868	$ 1,835
Allowance for loan associated with TDR	(1,040)	$ (459)	(1,040)	$ (459)	(722)
Net recorded investment	$ 795		$ 795		1,113
Number of contracts modified | loan	0	0	0	2
Number of loans classified as TDRs | loan		1
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment With Allowance	$ 1,835	$ 1,868	$ 1,835	$ 1,868	1,835
Allowance for loan associated with TDR	$ (1,040)	$ (459)	$ (1,040)	$ (459)	$ (722)