LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,557,397	$ 5,555,466
Nonaccrual Loans	5,313	5,251
Total Past Due and Nonaccrual	20,689	17,371
Nonaccrual Loans with No ACL	4,234	4,378
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	11,955	8,193
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,513	2,089
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,908	1,838
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,536,708	5,538,095
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,821	2,555
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	521
Nonaccrual Loans with No ACL	0	0
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	471
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	37
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program \| Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	13
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,821	2,034
Commercial, financial and agricultural: \| Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	555,064	543,947
Nonaccrual Loans	264	297
Total Past Due and Nonaccrual	1,378	1,000
Nonaccrual Loans with No ACL	0	0
Commercial, financial and agricultural: \| Other \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,114	546
Commercial, financial and agricultural: \| Other \| Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	131
Commercial, financial and agricultural: \| Other \| Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	26
Commercial, financial and agricultural: \| Other \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	553,686	542,947
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	181,474	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
Real Estate \| Construction \| Accruing Loans Greater Than 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	181,474	166,723
Real Estate \| Real estate, Mortgage - residential
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,941,230	1,940,999
Nonaccrual Loans	3,445	3,808
Total Past Due and Nonaccrual	9,546	4,670
Nonaccrual Loans with No ACL	3,445	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	5,984	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	117	0
Real Estate \| Real estate, Mortgage - residential \| Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	0	559
Real Estate \| Real estate, Mortgage - residential \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,931,684	1,936,329
Real Estate \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	743,908	739,380
Nonaccrual Loans	712	570
Total Past Due and Nonaccrual	1,154	2,110
Nonaccrual Loans with No ACL	712	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	442	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	0	0
Real Estate \| Home Equity \| Accruing Loans Greater Than 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	742,754	737,270
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,361,632	1,363,075
Nonaccrual Loans	77	0
Total Past Due and Nonaccrual	77	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	0	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 Greater Than 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	1,361,555	1,362,915
Consumer \| Consumer Loan
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	772,268	798,787
Nonaccrual Loans	815	576
Total Past Due and Nonaccrual	8,534	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	4,415	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	1,396	1,921
Consumer \| Consumer Loan \| Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,908	1,240
Consumer \| Consumer Loan \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 763,734	$ 789,877

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