LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,401,417	$ 5,438,982
Nonaccrual Loans	10,132	7,008
Total Past Due and Nonaccrual	25,016	23,434
Nonaccrual Loans With No ACL	7,954	5,766
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	9,091	10,076
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	3,335	5,038
Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,458	1,312
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,376,401	5,415,548
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	576,096	575,707
Nonaccrual Loans	357	432
Total Past Due and Nonaccrual	2,095	1,114
Nonaccrual Loans With No ACL	0	0
Commercial and Industrial \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,368	513
Commercial and Industrial \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	370	169
Commercial and Industrial \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Commercial and Industrial \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	574,001	574,593
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	168,569	185,519
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	588	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	588	0
Real Estate \| Construction \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	167,981	185,519
Real Estate \| Residential mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,924,889	1,927,789
Nonaccrual Loans	7,979	4,962
Total Past Due and Nonaccrual	12,414	10,184
Nonaccrual Loans With No ACL	6,948	4,855
Real Estate \| Residential mortgage \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,775	3,082
Real Estate \| Residential mortgage \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,274	2,140
Real Estate \| Residential mortgage \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	386	0
Real Estate \| Residential mortgage \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,912,475	1,917,605
Real Estate \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	729,210	736,524
Nonaccrual Loans	929	834
Total Past Due and Nonaccrual	2,196	2,267
Nonaccrual Loans With No ACL	929	834
Real Estate \| Home Equity \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	707	804
Real Estate \| Home Equity \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	400
Real Estate \| Home Equity \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	560	229
Real Estate \| Home Equity \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	727,014	734,257
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,422,262	1,382,902
Nonaccrual Loans	77	77
Total Past Due and Nonaccrual	77	77
Nonaccrual Loans With No ACL	77	77
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	0
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 \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,422,185	1,382,825
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	580,391	630,541
Nonaccrual Loans	790	703
Total Past Due and Nonaccrual	7,646	9,792
Nonaccrual Loans With No ACL	0	0
Consumer \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	4,241	5,677
Consumer \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,691	2,329
Consumer \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	924	1,083
Consumer \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 572,745	$ 620,749

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