LOANS AND LEASES - Originated Troubled Debt Restructurings, Payment Default (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) Contract	Jun. 30, 2020 USD ($) Contract	Jun. 30, 2021 USD ($) Contract	Jun. 30, 2020 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	11	3	21
Recorded Investment | $	$ 0	$ 1	$ 0	$ 3
Total Commercial Loans and Leases [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	5	1	10
Recorded Investment | $	$ 0	$ 1	$ 0	$ 3
Commercial Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract		4		8
Recorded Investment | $		$ 1		$ 3
Commercial and Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	1	1	2
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	6	2	11
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Direct Installment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	1	3	1	7
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Residential Mortgages [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract	0	1	1	2
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer Lines of Credit [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | Contract		2		2
Recorded Investment | $		$ 0		$ 0