LOANS AND LEASES - Loan Modifications (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 14.5	$ 18.4
Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	13.0	16.0
Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	1.3	1.8
Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	0.2	0.6
Commercial real estate | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 11.2	$ 11.5
% of Total Class of Financing Receivable	0.10%	0.10%
Term increase from modification	22 months	22 months
Commercial real estate | Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.3
% of Total Class of Financing Receivable		0.00%
Commercial and industrial | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 2.3
% of Total Class of Financing Receivable		0.03%
Term increase from modification		12 months
Commercial and industrial | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.1	$ 0.2
% of Total Class of Financing Receivable	0.00%	0.00%
Term reduction from modification	4.87%	4.87%
Direct installment | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.3	$ 0.4
% of Total Class of Financing Receivable	0.01%	0.01%
Direct installment | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.2	$ 0.3
% of Total Class of Financing Receivable	0.01%	0.01%
Term increase from modification	445 months	363 months
Residential mortgages | Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 1.5	$ 1.6
% of Total Class of Financing Receivable	0.02%	0.03%
Term increase from modification	138 months	141 months
Residential mortgages | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.4	$ 0.7
% of Total Class of Financing Receivable	0.01%	0.01%
Term increase from modification	151 months
Term reduction from modification		2.78%
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		$ 0.2
% of Total Class of Financing Receivable		0.02%
Consumer lines of credit | Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.6	$ 0.6
% of Total Class of Financing Receivable	0.05%	0.05%
Term reduction from modification	3.26%	3.26%
Consumer lines of credit | Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.2	$ 0.2
% of Total Class of Financing Receivable	0.02%	0.02%