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LOANS AND LEASES - Schedule of Loan Modifications, Subsequently Defaulted (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	$ 0.1	$ 0.9	$ 13.8	$ 34.8
Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.1	0.7	4.6	23.3
Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.1	3.5	0.3
Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.1		0.7
Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0	5.7	10.5
Total commercial loans and leases
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.1	0.1	10.3	32.3
Total commercial loans and leases | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.1	0.0	1.6	20.9
Total commercial loans and leases | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0	3.0	0.2
Total commercial loans and leases | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.1		0.7
Total commercial loans and leases | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.0	0.0	5.7	10.5
Total commercial loans and leases | Commercial real estate
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.1	0.1	3.0	10.3
Total commercial loans and leases | Commercial real estate | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	0.1	0.0	1.1	0.7
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	0.0	0.0	0.0
Total commercial loans and leases | Commercial real estate | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.1		0.7
Total commercial loans and leases | Commercial real estate | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted	$ 0.0	0.0	1.9	8.9
Total commercial loans and leases | Commercial and industrial
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			7.3	22.0
Total commercial loans and leases | Commercial and industrial | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			0.5	20.2
Total commercial loans and leases | Commercial and industrial | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			3.0	0.2
Total commercial loans and leases | Commercial and industrial | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted				0.0
Total commercial loans and leases | Commercial and industrial | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			3.8	1.6
Total consumer loans
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.8	3.5	2.5
Total consumer loans | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.7	3.0	2.4
Total consumer loans | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.1	0.5	0.1
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	0.0
Total consumer loans | Direct installment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.4	0.4	0.5
Total consumer loans | Direct installment | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.4	0.4	0.5
Total consumer loans | Direct installment | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.0	0.0	0.0
Total consumer loans | Direct installment | Balloon Payment
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.0		0.0
Total consumer loans | Direct installment | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.0	0.0	0.0
Total consumer loans | Residential mortgages
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.4	2.9	2.0
Total consumer loans | Residential mortgages | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.3	2.4	1.9
Total consumer loans | Residential mortgages | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted		0.1	0.5	0.1
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	$ 0.0
Total consumer loans | Consumer lines of credit
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			0.2
Total consumer loans | Consumer lines of credit | Term Extension
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			0.2
Total consumer loans | Consumer lines of credit | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			0.0
Total consumer loans | Consumer lines of credit | Other
Financing Receivable, Modified [Line Items]
Total loans that subsequently defaulted			$ 0.0

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