LOANS AND LEASES - Loan Modifications (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 59.2
Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	48.1
Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	2.0
Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	9.1
Commercial real estate | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 21.5
% of Total Class of Financing Receivable	0.17%
Term increase from modification	15 months
Commercial real estate | Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 8.3
% of Total Class of Financing Receivable	0.07%
Term increase from modification	6 months
Commercial and industrial | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 20.6
% of Total Class of Financing Receivable	0.28%
Term increase from modification	34 months
Commercial and industrial | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.1
% of Total Class of Financing Receivable	0.00%
Term reduction from modification	4.62%
Direct installment | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 1.7
% of Total Class of Financing Receivable	0.06%
Term increase from modification	90 months
Direct installment | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.4
% of Total Class of Financing Receivable	0.01%
Term increase from modification	319 months
Direct installment | Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.1
% of Total Class of Financing Receivable	0.00%
Residential mortgages | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 3.8
% of Total Class of Financing Receivable	0.06%
Term increase from modification	91 months
Residential mortgages | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.8
% of Total Class of Financing Receivable	0.01%
Term reduction from modification	2.67%
Residential mortgages | Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.1
% of Total Class of Financing Receivable	0.00%
Consumer lines of credit | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.5
% of Total Class of Financing Receivable	0.04%
Consumer lines of credit | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.7
% of Total Class of Financing Receivable	0.05%
Term reduction from modification	2.66%
Consumer lines of credit | Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.6
% of Total Class of Financing Receivable	0.05%
Term reduction from modification	5.08%