LOANS AND CREDIT QUALITY(Forbearance or Deferrals) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	171
Balance	$ 39,499
Accrued Interest Receivable	984
Loans	5,137,849	$ 4,964,113
Total Loans, Excl. PPP	$ 4,540,030
% of Asset Class	0.80%
% of Asset Class, Excl. PPP	0.009
Commercial, financial and agricultural \| Commercial, financial and agricultural
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	0
Balance	$ 0
Accrued Interest Receivable	0
Loans	$ 1,112,008
% of Asset Class	0.00%
Commercial, financial and agricultural \| Other
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loans	$ 514,189	545,091
% of Asset Class, Excl. PPP	0
Real Estate \| Construction
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	0
Balance	$ 0
Accrued Interest Receivable	0
Loans	$ 137,976	125,407
% of Asset Class	0.00%
% of Asset Class, Excl. PPP	0
Real Estate \| Residential Mortgage
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	88
Balance	$ 38,571
Accrued Interest Receivable	984
Loans	$ 1,687,513	1,690,212
% of Asset Class	2.30%
% of Asset Class, Excl. PPP	0.023
Real Estate \| Home Equity
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	0
Balance	$ 0
Accrued Interest Receivable	0
Loans	$ 559,514	551,266
% of Asset Class	0.00%
% of Asset Class, Excl. PPP	0
Real Estate \| Commercial Mortgage
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	0
Balance	$ 0
Accrued Interest Receivable	0
Loans	$ 1,164,338	1,156,328
% of Asset Class	0.00%
% of Asset Class, Excl. PPP	0
Consumer Portfolio Segment [Member] \| Consumer
ALLOWANCE FOR LOAN AND LEASE LOSSES
Loan Count \| loan	83
Balance	$ 928
Accrued Interest Receivable	0
Loans	$ 476,500	$ 479,434
% of Asset Class	0.20%
% of Asset Class, Excl. PPP	0.002

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Financing Receivable, Accrued Interest Receivable

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Financing Receivable, Number Of Loans

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Loans and Leases Receivable, Net of Deferred Income, Excluding PPP Loans

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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