LOANS AND LEASES - Schedule of Loan Modifications, Subsequently Defaulted (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	$ 54.9	$ 33.1
Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	25.7	22.0
Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	16.3	1.2
Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.7	0.6
Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	12.2	9.3
Total commercial loans and leases
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	48.0	32.9
Total commercial loans and leases | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	19.6	21.8
Total commercial loans and leases | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	15.5	1.2
Total commercial loans and leases | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.7	0.6
Total commercial loans and leases | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	12.2	9.3
Total commercial loans and leases | Commercial real estate
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	8.1	10.5
Total commercial loans and leases | Commercial real estate | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	1.0	0.3
Total commercial loans and leases | Commercial real estate | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.9
Total commercial loans and leases | Commercial real estate | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.7	0.6
Total commercial loans and leases | Commercial real estate | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	6.4	8.7
Total commercial loans and leases | Commercial and industrial
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	39.9	22.4
Total commercial loans and leases | Commercial and industrial | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	18.6	21.5
Total commercial loans and leases | Commercial and industrial | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	15.5	0.3
Total commercial loans and leases | Commercial and industrial | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0
Total commercial loans and leases | Commercial and industrial | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	5.8	0.6
Total consumer loans
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	6.9	0.2
Total consumer loans | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	6.1	0.2
Total consumer loans | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.8	0.0
Total consumer loans | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0
Total consumer loans | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0
Total consumer loans | Direct installment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.8
Total consumer loans | Direct installment | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.8
Total consumer loans | Direct installment | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0
Total consumer loans | Direct installment | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0
Total consumer loans | Direct installment | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0
Total consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	6.1	0.2
Total consumer loans | Residential mortgages | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	5.3	0.2
Total consumer loans | Residential mortgages | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.8	0.0
Total consumer loans | Residential mortgages | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0
Total consumer loans | Residential mortgages | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	$ 0.0	$ 0.0