LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in non-accrual loans by class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 12,412	$ 12,987
Recorded investments	12,400	13,000
Cash, Securities and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	10,977	11,252
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 1,435	$ 1,735