LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,367,202	$ 5,332,852
Nonaccrual Loans	14,319	11,018
Total Past Due and Nonaccrual	25,149	35,303
Nonaccrual Loans With No ACL	13,692	9,996
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,406	18,056
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	3,916	5,455
Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,508	774
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,342,053	5,297,549
Commercial and Industrial
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	608,814	606,936
Nonaccrual Loans	357	414
Total Past Due and Nonaccrual	2,118	3,602
Nonaccrual Loans With No ACL	160	0
Commercial and Industrial \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	940	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	821	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	606,696	603,334
Real Estate Portfolio Segment [Member] \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	217,610	145,211
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	0
Nonaccrual Loans With No ACL	0	0
Real Estate Portfolio Segment [Member] \| 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 Portfolio Segment [Member] \| 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 Portfolio Segment [Member] \| Construction \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate Portfolio Segment [Member] \| Construction \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	217,610	145,211
Real Estate Portfolio Segment [Member] \| Residential mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,839,535	1,892,520
Nonaccrual Loans	11,413	9,044
Total Past Due and Nonaccrual	13,587	21,563
Nonaccrual Loans With No ACL	11,413	9,044
Real Estate Portfolio Segment [Member] \| Residential mortgage \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	8,880
Real Estate Portfolio Segment [Member] \| Residential mortgage \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,015	3,316
Real Estate Portfolio Segment [Member] \| Residential mortgage \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,159	323
Real Estate Portfolio Segment [Member] \| Residential mortgage \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,825,948	1,870,957
Real Estate Portfolio Segment [Member] \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	610,889	676,982
Nonaccrual Loans	2,119	952
Total Past Due and Nonaccrual	3,052	2,458
Nonaccrual Loans With No ACL	2,119	952
Real Estate Portfolio Segment [Member] \| Home Equity \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	175	943
Real Estate Portfolio Segment [Member] \| Home Equity \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	758	485
Real Estate Portfolio Segment [Member] \| Home Equity \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	78
Real Estate Portfolio Segment [Member] \| Home Equity \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	607,837	674,524
Real Estate Portfolio Segment [Member] \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,613,187	1,500,680
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	831	0
Nonaccrual Loans With No ACL	0	0
Real Estate Portfolio Segment [Member] \| Commercial mortgage \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	831	0
Real Estate Portfolio Segment [Member] \| 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 Portfolio Segment [Member] \| 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 Portfolio Segment [Member] \| Commercial mortgage \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,612,356	1,500,680
Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	477,167	510,523
Nonaccrual Loans	430	608
Total Past Due and Nonaccrual	5,561	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	3,460	5,255
Consumer \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,322	1,444
Consumer \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	349	373
Consumer \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 471,606	$ 502,843

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