ALLOWANCE FOR LOAN AND LEASE LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Types of TDR (Details) - loan	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	6	6	25	29
Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	2	0
Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1	2	3
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	3	3	6
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	1
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	0	6	4
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	5	2	12	15
Contractual payment reduction and term extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	5	10	20
Contractual payment reduction and term extension | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Contractual payment reduction and term extension | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1	1	2
Contractual payment reduction and term extension | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	3	0	6
Contractual payment reduction and term extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Contractual payment reduction and term extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	4	4
Contractual payment reduction and term extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1	5	8
Maturity Date Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	0	4	3
Maturity Date Extension | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Maturity Date Extension | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	1
Maturity Date Extension | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	1	0
Maturity Date Extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	1
Maturity Date Extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Maturity Date Extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	0	3	1
Discharged in bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	1	4	4
Discharged in bankruptcy | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Discharged in bankruptcy | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Discharged in bankruptcy | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Discharged in bankruptcy | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Discharged in bankruptcy | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	0	2	0
Discharged in bankruptcy | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	1	2	4
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	0	7	2
Other | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	2	0
Other | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	1	0
Other | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	2	0
Other | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Other | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0	0	0
Other | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	0	2	2