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