LOANS AND LEASES - Schedule of Loan Modifications, Aging Analysis (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current
Financing Receivable, Modified [Line Items]
Total	$ 49.4	$ 47.8
30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	2.4	11.3
90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	1.5	0.1
Total commercial loans and leases | Current
Financing Receivable, Modified [Line Items]
Total	41.3	41.5
Total commercial loans and leases | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	9.1
Total commercial loans and leases | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	0.0
Total commercial loans and leases | Commercial real estate | Current
Financing Receivable, Modified [Line Items]
Total	20.5	20.7
Total commercial loans and leases | Commercial real estate | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	9.1
Total commercial loans and leases | Commercial real estate | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	0.0
Total commercial loans and leases | Commercial and industrial | Current
Financing Receivable, Modified [Line Items]
Total	20.8	20.8
Total commercial loans and leases | Commercial and industrial | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	0.0
Total commercial loans and leases | Commercial and industrial | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	0.0
Total consumer loans | Current
Financing Receivable, Modified [Line Items]
Total	8.1	6.3
Total consumer loans | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	2.4	2.2
Total consumer loans | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	1.5	0.1
Total consumer loans | Direct installment | Current
Financing Receivable, Modified [Line Items]
Total	1.2	1.9
Total consumer loans | Direct installment | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.3	0.3
Total consumer loans | Direct installment | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.0	0.0
Total consumer loans | Residential mortgages | Current
Financing Receivable, Modified [Line Items]
Total	5.5	2.8
Total consumer loans | Residential mortgages | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	1.8	1.7
Total consumer loans | Residential mortgages | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	1.5	0.1
Total consumer loans | Consumer lines of credit | Current
Financing Receivable, Modified [Line Items]
Total	1.4	1.6
Total consumer loans | Consumer lines of credit | 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0.3	0.2
Total consumer loans | Consumer lines of credit | 90+ Days Past Due
Financing Receivable, Modified [Line Items]
Total	$ 0.0	$ 0.0