LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Summary of unpaid principal balance of loans classified as TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	$ 17,835	$ 1,835
Allowance for loan associated with TDR	(940)	(722)
Net recorded investment	$ 16,895	$ 1,113
Number of loans classified as TDRs | loan	2	1
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	$ 6,583	$ 1,835
Allowance for loan associated with TDR	(940)	$ (722)
Cash, Securities and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Recorded Investment	$ 11,252