ALLOWANCE FOR LOAN AND LEASE LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Loans Identified as Troubled Debt Restructurings During Periods Indicated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	$ 753	$ 601	$ 5,729	$ 9,917
Commercial and Industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	0	320	1,335	5,102
Commercial mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	0	168	504	2,190
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	0	0	0	920
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	253	0	670	469
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	500	113	1,807	1,236
Owner-occupied commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans identified during the period	$ 0	$ 0	$ 1,413	$ 0