LOANS AND LEASES - Originated Troubled Debt Restructurings, Payment Default (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Contract	Sep. 30, 2018 USD ($) Contract	Sep. 30, 2019 USD ($) Contract	Sep. 30, 2018 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	3	10	12	16
Recorded Investment | $	$ 0	$ 1	$ 1	$ 2
Total Commercial Loans and Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	5	6	4
Recorded Investment | $	$ 0	$ 1	$ 1	$ 1
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	3	5	3
Recorded Investment | $	$ 0	$ 1	$ 1	$ 1
Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	2	1	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	2	5	6	12
Recorded Investment | $	$ 0	$ 0	$ 0	$ 1
Direct Installment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	3	4	5
Recorded Investment | $	$ 0	$ 0	$ 0	$ 1
Residential Mortgages [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	2	1	4
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Indirect Installment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract		0		0
Recorded Investment | $		$ 0		$ 0
Consumer Lines of Credit [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	0	1	3
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0