LOANS AND LEASES - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) loans	Jun. 30, 2023 USD ($) loans	Jun. 30, 2024 USD ($) loans	Jun. 30, 2023 USD ($) loans	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 200,000	$ 200,000	$ 400,000	$ 200,000
Real Estate Acquired Through Foreclosure	30,000	$ 281,000	30,000	$ 281,000	$ 161,000	$ 106,000	$ 191,000	$ 191,000
Loans and Leases Receivable, Net of Deferred Income	11,521,203,000		11,521,203,000			10,933,176,000
Unused Commitments to Extend Credit	$ 3,804,386,000		$ 3,804,386,000			3,982,599,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans	2	1	5	1
Nonaccrual loans	$ 300,000	$ 300,000
Commercial segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	17,665,000		$ 17,665,000			15,746,000
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	12,715,000		12,715,000			14,067,000
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,374,000		5,374,000			$ 3,610,000
Financial Difficulty Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused Commitments to Extend Credit	$ 0	$ 0	$ 0	$ 0