LOANS AND LEASES - Additional Information (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) loans	Sep. 30, 2023 USD ($) loans	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 400,000	$ 600,000
Restructured Loans, Nonaccrual Status				$ 10,000,000
Real Estate Acquired Through Foreclosure	142,000	142,000	$ 281,000	191,000	$ 22,000	$ 22,000	$ 98,000
Loans and Leases Receivable, Net of Deferred Income	10,646,819,000	10,646,819,000		10,298,971,000
Unused Commitments to Extend Credit	$ 4,013,747,000	$ 4,013,747,000		3,904,732,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans	4	5
Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 17,152,000	$ 17,152,000		8,242,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum		250,000
Loans and Leases Receivable, Net of Deferred Income	12,328,000	12,328,000		10,691,000
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,731,000	7,731,000		$ 178,000
Financial Difficulty Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused Commitments to Extend Credit	$ 0	$ 0