LOANS AND LEASES - Originated Troubled Debt Restructurings, Payment Default (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Contract	Sep. 30, 2019 USD ($) Contract	Sep. 30, 2020 USD ($) Contract	Sep. 30, 2019 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	6	3	28	12
Recorded Investment | $	$ 0	$ 0	$ 4	$ 1
Total Commercial Loans and Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	1	11	6
Recorded Investment | $	$ 0	$ 0	$ 3	$ 1
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	1	8	5
Recorded Investment | $	$ 0	$ 0	$ 3	$ 1
Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	0	3	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	5	2	17	6
Recorded Investment | $	$ 0	$ 0	$ 1	$ 0
Direct Installment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	4	1	12	4
Recorded Investment | $	$ 0	$ 0	$ 1	$ 0
Residential Mortgages [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	0	2	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer Lines of Credit [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	1	3	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0