LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 5,520,683	$ 5,555,466
Nonaccrual Loans	11,061	5,251
Total Past Due and Nonaccrual	25,329	17,371
Nonaccrual Loans with No ACL	10,110	4,378
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	6,206	8,193
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	4,763	2,089
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	3,299	1,838
Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5,495,354	5,538,095
Commercial, financial and agricultural: \| SBA PPP
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,565	2,555
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	5	521
Nonaccrual Loans with No ACL	0	0
Commercial, financial and agricultural: \| SBA PPP \| Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	5	471
Commercial, financial and agricultural: \| SBA PPP \| 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: \| SBA PPP \| 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: \| SBA PPP \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,560	2,034
Commercial, financial and agricultural: \| Other
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	543,593	543,947
Nonaccrual Loans	319	297
Total Past Due and Nonaccrual	871	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	454	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	98	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	542,722	542,947
Real Estate \| Construction
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	200,819	166,723
Nonaccrual Loans	4,851	0
Total Past Due and Nonaccrual	4,851	0
Nonaccrual Loans with No ACL	4,851	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 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	195,968	166,723
Real Estate \| Real estate, Mortgage - residential
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,942,906	1,940,999
Nonaccrual Loans	4,385	3,808
Total Past Due and Nonaccrual	8,285	4,670
Nonaccrual Loans with No ACL	4,385	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	0	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	2,941	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	959	559
Real Estate \| Real estate, Mortgage - residential \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,934,621	1,936,329
Real Estate \| Home Equity
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	750,760	739,380
Nonaccrual Loans	797	570
Total Past Due and Nonaccrual	2,731	2,110
Nonaccrual Loans with No ACL	797	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	1,623	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	178	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	133	0
Real Estate \| Home Equity \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	748,029	737,270
Real Estate \| Commercial mortgage
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	1,367,562	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	1,367,485	1,362,915
Consumer \| Consumer Loan
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	713,478	798,787
Nonaccrual Loans	632	576
Total Past Due and Nonaccrual	8,509	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	4,124	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	1,546	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	2,207	1,240
Consumer \| Consumer Loan \| Loans Not Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Loans Past Due	$ 704,969	$ 789,877

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