LOANS AND LEASES - Schedule of Loan Modifications (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 18.3	$ 53.3	$ 59.2
Term Extension
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	12.9	10.5	48.1
Term Extension | Commercial real estate
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 2.3	$ 0.3	$ 21.5
% of Total Class of Financing Receivable	0.02%	0.00%	0.17%
Term increase from modification	6 months	7 months	15 months
Term Extension | Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 1.2	$ 0.1	$ 20.6
% of Total Class of Financing Receivable	0.02%	0.00%	0.28%
Term increase from modification	21 months		34 months
Term Extension | Direct installment
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 2.7	$ 1.5	$ 1.7
% of Total Class of Financing Receivable	0.10%	0.06%	0.06%
Term increase from modification	77 months	65 months	90 months
Term Extension | Residential mortgages
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 6.0	$ 7.3	$ 3.8
% of Total Class of Financing Receivable	0.07%	0.09%	0.06%
Term increase from modification	37 months	70 months	91 months
Term Extension | Consumer lines of credit
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.7	$ 1.3	$ 0.5
% of Total Class of Financing Receivable	0.05%	0.09%	0.04%
Term increase from modification	169 months	221 months
Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.1
Rate Reduction | Residential mortgages
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.1
% of Total Class of Financing Receivable		0.00%
Term Extension and Rate Reduction
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 3.2	$ 34.6	$ 2.0
Term Extension and Rate Reduction | Commercial real estate
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 17.6
% of Total Class of Financing Receivable		0.14%
Term reduction from modification		1.90%
Term Extension and Rate Reduction | Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 15.5	$ 0.1
% of Total Class of Financing Receivable		0.21%	0.00%
Term increase from modification		6 months
Term reduction from modification			4.62%
Term Extension and Rate Reduction | Direct installment
Financing Receivable, Modified [Line Items]
Amortized Cost Basis			$ 0.4
% of Total Class of Financing Receivable			0.01%
Term increase from modification			319 months
Term Extension and Rate Reduction | Residential mortgages
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 3.2	$ 1.3	$ 0.8
% of Total Class of Financing Receivable	0.04%	0.02%	0.01%
Term increase from modification	28 years
Term reduction from modification			2.67%
Term Extension and Rate Reduction | Residential mortgages | Minimum
Financing Receivable, Modified [Line Items]
Term reduction from modification	0.32%
Term Extension and Rate Reduction | Residential mortgages | Maximum
Financing Receivable, Modified [Line Items]
Term reduction from modification	4.75%
Term Extension and Rate Reduction | Consumer lines of credit
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.2	$ 0.7
% of Total Class of Financing Receivable		0.01%	0.05%
Term reduction from modification			2.66%
Balloon Payment
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.9
Balloon Payment | Commercial real estate
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.7
% of Total Class of Financing Receivable		0.01%
Balloon Payment | Consumer lines of credit
Financing Receivable, Modified [Line Items]
Amortized Cost Basis		$ 0.2
% of Total Class of Financing Receivable		0.03%
Other
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 2.2	$ 7.2	$ 9.1
Other | Commercial real estate
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 1.5	$ 2.0	$ 8.3
% of Total Class of Financing Receivable	0.01%	0.02%	0.07%
Term increase from modification			6 months
Other | Commercial real estate | Minimum
Financing Receivable, Modified [Line Items]
Term for payment deferrals		3 months
Other | Commercial real estate | Maximum
Financing Receivable, Modified [Line Items]
Term for payment deferrals		12 months
Other | Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized Cost Basis	$ 0.7	$ 5.2
% of Total Class of Financing Receivable	0.01%	0.07%
Term for payment deferrals	3 months
Other | Commercial and industrial | Minimum
Financing Receivable, Modified [Line Items]
Term for payment deferrals	3 months	3 months
Other | Commercial and industrial | Maximum
Financing Receivable, Modified [Line Items]
Term for payment deferrals	6 months	9 months
Other | Direct installment
Financing Receivable, Modified [Line Items]
Amortized Cost Basis			$ 0.1
% of Total Class of Financing Receivable			0.00%
Other | Residential mortgages
Financing Receivable, Modified [Line Items]
Amortized Cost Basis			$ 0.1
% of Total Class of Financing Receivable			0.00%
Other | Consumer lines of credit
Financing Receivable, Modified [Line Items]
Amortized Cost Basis			$ 0.6
% of Total Class of Financing Receivable			0.05%
Term reduction from modification			5.08%