LOANS AND CREDIT QUALITY (Loans and Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
LOANS AND LEASES
Loans and leases, gross	$ 5,439,215	$ 5,556,312
Net deferred fees and costs	(233)	(846)
Loans, net of deferred fees and costs	5,438,982	5,555,466
Commercial and Industrial \| Small Business Administration Paycheck Protection Program ("SBA PPP")
LOANS AND LEASES
Loans and leases, gross	1,313	2,654
Commercial and Industrial \| Other
LOANS AND LEASES
Loans and leases, gross	574,725	544,495
Real Estate \| Construction
LOANS AND LEASES
Loans and leases, gross	185,994	167,366
Real Estate \| Residential mortgage
LOANS AND LEASES
Loans and leases, gross	1,927,206	1,940,456
Real Estate \| Home equity
LOANS AND LEASES
Loans and leases, gross	734,500	737,386
Real Estate \| Commercial mortgage
LOANS AND LEASES
Loans and leases, gross	1,384,579	1,364,998
Consumer \| Consumer
LOANS AND LEASES
Loans and leases, gross	$ 630,898	$ 798,957

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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