LOANS AND LEASES - Troubled Debt Restructurings, Payment Default (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) contract	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) contract
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		16		24
Recorded Investment | $	$ 1.0	$ 4.0	$ 4.2	$ 4.0
Total commercial loans and leases
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		8		11
Recorded Investment | $	0.8	$ 3.0	3.6	$ 3.0
Total commercial loans and leases | Commercial real estate
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		7		10
Recorded Investment | $	0.2	$ 3.0	1.3	$ 3.0
Total commercial loans and leases | Commercial and industrial
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		1		1
Recorded Investment | $	0.6	$ 0.0	2.3	$ 0.0
Total consumer loans
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		8		13
Recorded Investment | $	0.2	$ 1.0	0.6	$ 1.0
Total consumer loans | Direct installment
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		3		5
Recorded Investment | $	0.1	$ 0.0	0.1	$ 0.0
Total consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Number of Contracts | contract		5		8
Recorded Investment | $	$ 0.1	$ 1.0	$ 0.4	$ 1.0