LOANS AND LEASES - Financial Difficulty Modifications (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 8,144	$ 904
Finance Receivable Percentage Of Class Of Loans And Leases	0.0007	0.0008
Derivative liabilities	$ 293,926		$ 263,131
Unused Commitments to Extend Credit	3,953,058		3,982,599
Foreign Exchange | Fair Value, Measurements, Recurring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derivative liabilities	162,496		145,556
Foreign Exchange | Fair Value Measurements Using Level 1 | Fair Value, Measurements, Recurring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derivative liabilities	0		0
Foreign Exchange | Fair Value Measurements Using Level 2 | Fair Value, Measurements, Recurring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derivative liabilities	162,496		145,556
Foreign Exchange | Fair Value Measurements Using Level 3 | Fair Value, Measurements, Recurring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derivative liabilities	0		0
Financial Difficulty Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused Commitments to Extend Credit	0	$ 0
Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	0
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	0	0
Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	596	725
Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 7,548	$ 106
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Term Extension	0.2 years	12.5 years
Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction	0.00%	1.66%
Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 73
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 7,548
Finance Receivable Percentage Of Class Of Loans And Leases	0.0021
Unused Commitments to Extend Credit	$ 1,968,264		1,942,868
Commercial | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification	0
Commercial | Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0
Commercial | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 7,548
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Term Extension	0.2 years
Commercial | Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction	0.00%
Commercial | Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 556	$ 889
Finance Receivable Percentage Of Class Of Loans And Leases	0.0004	0.0008
Unused Commitments to Extend Credit	$ 79,238		98,686
Residential real estate | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 0
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification		0
Residential real estate | Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	556	725
Residential real estate | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 106
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Term Extension		11.6 years
Residential real estate | Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 0
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction		2.00%
Residential real estate | Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 58
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 40	$ 15
Finance Receivable Percentage Of Class Of Loans And Leases	0.0001	0.0000
Unused Commitments to Extend Credit	$ 985,993		972,474
Home equity | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 0
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification		0
Home equity | Payment Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	40	0
Home equity | Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 0
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Term Extension		22.6 years
Home equity | Contractual Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 0
Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction		0.31%
Home equity | Term Extension and Interest Rate Reduction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Postmodification	0	$ 15
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused Commitments to Extend Credit	$ 29,905		$ 25,841