ALLOWANCE FOR LOAN AND LEASE LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Types of TDR (Details) - loan	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	7	6
Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	1
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	4	4
Contractual payment reduction and term extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	1
Contractual payment reduction and term extension | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Contractual payment reduction and term extension | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	0
Contractual payment reduction and term extension | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Contractual payment reduction and term extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Contractual payment reduction and term extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Contractual payment reduction and term extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1
Maturity Date Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	3
Maturity Date Extension | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Maturity Date Extension | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1
Maturity Date Extension | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Maturity Date Extension | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1
Maturity Date Extension | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Maturity Date Extension | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	1
Discharged in bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	2	0
Discharged in bankruptcy | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Discharged in bankruptcy | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Discharged in bankruptcy | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Discharged in bankruptcy | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Discharged in bankruptcy | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	0
Discharged in bankruptcy | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	0
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	4	2
Other | Owner-occupied commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Other | Commercial mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Other | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Other | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	0	0
Other | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	1	0
Other | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Modification Total	3	2