LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,508,710	$ 5,555,466
Nonaccrual Loans	6,652	5,251
Total Past Due and Nonaccrual	21,723	17,371
Nonaccrual Loans with No ACL	5,562	4,378
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	9,063	8,193
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	3,094	2,089
Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,914	1,838
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,486,987	5,538,095
Commercial and Industrial \| SBA PPP
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,410	2,555
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	417	521
Nonaccrual Loans with No ACL	0	0
Commercial and Industrial \| SBA PPP \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	351	471
Commercial and Industrial \| SBA PPP \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	66	37
Commercial and Industrial \| 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 \| SBA PPP \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	993	2,034
Commercial and Industrial \| Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	562,396	543,947
Nonaccrual Loans	352	297
Total Past Due and Nonaccrual	353	1,000
Nonaccrual Loans with No ACL	0	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	0	546
Commercial and Industrial \| Other \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1	131
Commercial and Industrial \| Other \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	26
Commercial and Industrial \| Other \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	562,043	542,947
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	211,512	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 \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	211,512	166,723
Real Estate \| Real estate, Mortgage - residential
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,930,740	1,940,999
Nonaccrual Loans	4,949	3,808
Total Past Due and Nonaccrual	7,731	4,670
Nonaccrual Loans with No ACL	4,808	3,808
Real Estate \| Real estate, Mortgage - residential \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,852	303
Real Estate \| Real estate, Mortgage - residential \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	136	0
Real Estate \| Real estate, Mortgage - residential \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	794	559
Real Estate \| Real estate, Mortgage - residential \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,923,009	1,936,329
Real Estate \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	753,980	739,380
Nonaccrual Loans	677	570
Total Past Due and Nonaccrual	2,600	2,110
Nonaccrual Loans with No ACL	677	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	1,183	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	740	0
Real Estate \| Home Equity \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	0
Real Estate \| Home Equity \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	751,380	737,270
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,365,427	1,363,075
Nonaccrual Loans	77	0
Total Past Due and Nonaccrual	396	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	319	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 \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,365,031	1,362,915
Consumer \| Consumer Loan
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	683,245	798,787
Nonaccrual Loans	597	576
Total Past Due and Nonaccrual	10,226	8,910
Nonaccrual Loans with No ACL	0	0
Consumer \| Consumer Loan \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,358	5,173
Consumer \| Consumer Loan \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,151	1,921
Consumer \| Consumer Loan \| Accruing Loans 90+ Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	2,120	1,240
Consumer \| Consumer Loan \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 673,019	$ 789,877

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