LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,438,982	$ 5,555,466
Nonaccrual Loans	7,008	5,251
Total Past Due and Nonaccrual	23,434	17,371
Nonaccrual Loans with No ACL	5,766	4,378
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	10,076	8,193
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,038	2,089
Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,312	1,838
Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,415,548	5,538,095
Commercial and industrial:
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans		297
Total Past Due and Nonaccrual		1,000
Nonaccrual Loans with No ACL		0
Commercial and industrial: \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due		546
Commercial and industrial: \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due		131
Commercial and industrial: \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due		26
Commercial and industrial: \| Small Business Administration Paycheck Protection Program ("SBA PPP")
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,284	2,555
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	521
Nonaccrual Loans with No ACL	0	0
Commercial and industrial: \| Small Business Administration Paycheck Protection Program ("SBA PPP") \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	471
Commercial and industrial: \| Small Business Administration Paycheck Protection Program ("SBA PPP") \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	37
Commercial and industrial: \| Small Business Administration Paycheck Protection Program ("SBA PPP") \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	13
Commercial and industrial: \| Small Business Administration Paycheck Protection Program ("SBA PPP") \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,284	2,034
Commercial and industrial: \| Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	574,423	543,947
Nonaccrual Loans	432
Total Past Due and Nonaccrual	1,114
Nonaccrual Loans with No ACL	0
Commercial and industrial: \| Other \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	513
Commercial and industrial: \| Other \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	169
Commercial and industrial: \| Other \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0
Commercial and industrial: \| Other \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	573,309	542,947
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	185,519	166,723
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	0
Nonaccrual Loans with No ACL	0	0
Real Estate \| Construction \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate \| Construction \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate \| Construction \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate \| Construction \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	185,519	166,723
Real Estate \| Residential mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,927,789	1,940,999
Nonaccrual Loans	4,962	3,808
Total Past Due and Nonaccrual	10,184	4,670
Nonaccrual Loans with No ACL	4,855	3,808
Real Estate \| Residential mortgage \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	3,082	303
Real Estate \| Residential mortgage \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,140	0
Real Estate \| Residential mortgage \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	559
Real Estate \| Residential mortgage \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,917,605	1,936,329
Real Estate \| Home equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	736,524	739,380
Nonaccrual Loans	834	570
Total Past Due and Nonaccrual	2,267	2,110
Nonaccrual Loans with No ACL	834	570
Real Estate \| Home equity \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	804	1,540
Real Estate \| Home equity \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	400	0
Real Estate \| Home equity \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	229	0
Real Estate \| Home equity \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	734,257	737,270
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,382,902	1,363,075
Nonaccrual Loans	77	0
Total Past Due and Nonaccrual	77	160
Nonaccrual Loans with No ACL	77	0
Real Estate \| Commercial mortgage \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	160
Real Estate \| Commercial mortgage \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate \| Commercial mortgage \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate \| Commercial mortgage \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,382,825	1,362,915
Consumer \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	630,541	798,787
Nonaccrual Loans	703	576
Total Past Due and Nonaccrual	9,792	8,910
Nonaccrual Loans with No ACL	0	0
Consumer \| Consumer \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,677	5,173
Consumer \| Consumer \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,329	1,921
Consumer \| Consumer \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,083	1,240
Consumer \| Consumer \| Financial Asset, Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 620,749	$ 789,877

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