LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,289,809	$ 5,332,852
Nonaccrual Loans	14,895	11,018
Total Past Due and Nonaccrual	30,775	35,303
Nonaccrual Loans With No ACL	14,216	9,996
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	6,997	18,056
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	6,819	5,455
Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,064	774
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,259,034	5,297,549
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	608,130	606,936
Nonaccrual Loans	110	414
Total Past Due and Nonaccrual	1,942	3,602
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	1,601	2,978
Commercial and Industrial \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	231	210
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	606,188	603,334
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	190,008	145,211
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	190,008	145,211
Real Estate \| Residential mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,851,690	1,892,520
Nonaccrual Loans	12,327	9,044
Total Past Due and Nonaccrual	18,722	21,563
Nonaccrual Loans With No ACL	12,327	9,044
Real Estate \| Residential mortgage \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	693	8,880
Real Estate \| Residential mortgage \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	4,077	3,316
Real Estate \| Residential mortgage \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,625	323
Real Estate \| Residential mortgage \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,832,968	1,870,957
Real Estate \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	627,834	676,982
Nonaccrual Loans	1,889	952
Total Past Due and Nonaccrual	3,649	2,458
Nonaccrual Loans With No ACL	1,889	952
Real Estate \| Home Equity \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	716	943
Real Estate \| Home Equity \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,023	485
Real Estate \| Home Equity \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	21	78
Real Estate \| Home Equity \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	624,185	674,524
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,540,523	1,500,680
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	481	0
Nonaccrual Loans With No ACL	0	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	481	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	1,540,042	1,500,680
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	471,624	510,523
Nonaccrual Loans	569	608
Total Past Due and Nonaccrual	5,981	7,680
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	3,506	5,255
Consumer \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,488	1,444
Consumer \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	418	373
Consumer \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 465,643	$ 502,843

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