LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,383,644	$ 5,438,982
Nonaccrual Loans	10,257	7,008
Total Past Due and Nonaccrual	23,736	23,434
Nonaccrual Loans With No ACL	9,315	5,766
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	8,115	10,076
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	3,060	5,038
Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,304	1,312
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,359,908	5,415,548
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	584,856	575,707
Nonaccrual Loans	355	432
Total Past Due and Nonaccrual	1,135	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	597	513
Commercial and Industrial \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	183	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	583,721	574,593
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	171,522	185,519
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 \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	171,522	185,519
Real Estate \| Residential mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,913,177	1,927,789
Nonaccrual Loans	7,991	4,962
Total Past Due and Nonaccrual	11,242	10,184
Nonaccrual Loans With No ACL	7,991	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	626	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	1,352	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	1,273	0
Real Estate \| Residential mortgage \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,901,935	1,917,605
Real Estate \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	706,811	736,524
Nonaccrual Loans	1,247	834
Total Past Due and Nonaccrual	3,383	2,267
Nonaccrual Loans With No ACL	1,247	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	2,001	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	135	229
Real Estate \| Home Equity \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	703,428	734,257
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,465,370	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	1,465,293	1,382,825
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	541,908	630,541
Nonaccrual Loans	587	703
Total Past Due and Nonaccrual	7,899	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	4,891	5,677
Consumer \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,525	2,329
Consumer \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	896	1,083
Consumer \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 534,009	$ 620,749

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