LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	$ 3,547	$ 1,555
Total Past Due and Nonaccrual	24,579	12,497
Loans and Leases Not Past Due	4,487,419	4,437,043
Loans, net of allowance for credit losses	4,511,998	4,449,540
Nonaccrual Loans With No ACL	2,832	1,071
Commercial, Financial & Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	667	467
Total Past Due and Nonaccrual	8,429	1,808
Loans and Leases Not Past Due	566,895	568,496
Loans, net of allowance for credit losses	575,324	570,304
Nonaccrual Loans With No ACL	0	0
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	17,498	6,931
Accruing Loans 30 - 59 Days Past Due \| Commercial, Financial & Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	7,050	476
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,961	3,001
Accruing Loans 60 - 89 Days Past Due \| Commercial, Financial & Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	712	865
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,573	1,010
Accruing Loans Greater Than 90 Days Past Due \| Commercial, Financial & Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	0
Residential Mortgage \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	2,287	979
Total Past Due and Nonaccrual	7,961	4,122
Loans and Leases Not Past Due	1,624,575	1,595,679
Loans, net of allowance for credit losses	1,632,536	1,599,801
Nonaccrual Loans With No ACL	2,287	979
Residential Mortgage \| Accruing Loans 30 - 59 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	4,371	1,830
Residential Mortgage \| Accruing Loans 60 - 89 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	82	589
Residential Mortgage \| Accruing Loans Greater Than 90 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,221	724
Construction \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	478	643
Loans and Leases Not Past Due	100,139	95,211
Loans, net of allowance for credit losses	100,617	95,854
Nonaccrual Loans With No ACL	0	0
Construction \| Accruing Loans 30 - 59 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	478	643
Construction \| Accruing Loans 60 - 89 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	0
Construction \| Accruing Loans Greater Than 90 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	0
Home Equity \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	545	92
Total Past Due and Nonaccrual	1,118	1,058
Loans and Leases Not Past Due	503,568	489,676
Loans, net of allowance for credit losses	504,686	490,734
Nonaccrual Loans With No ACL	545	92
Home Equity \| Accruing Loans 30 - 59 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	573	759
Home Equity \| Accruing Loans 60 - 89 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	207
Home Equity \| Accruing Loans Greater Than 90 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	0
Commercial Mortgage \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	287	397
Loans and Leases Not Past Due	1,138,850	1,123,018
Loans, net of allowance for credit losses	1,139,137	1,123,415
Nonaccrual Loans With No ACL	0	0
Commercial Mortgage \| Accruing Loans 30 - 59 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	287	0
Commercial Mortgage \| Accruing Loans 60 - 89 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	397
Commercial Mortgage \| Accruing Loans Greater Than 90 Days Past Due \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0	0
Consumer \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	48	17
Total Past Due and Nonaccrual	6,306	4,469
Loans and Leases Not Past Due	553,392	564,963
Loans, net of allowance for credit losses	559,698	569,432
Nonaccrual Loans With No ACL	0	0
Consumer \| Accruing Loans 30 - 59 Days Past Due \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	4,739	3,223
Consumer \| Accruing Loans 60 - 89 Days Past Due \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,167	943
Consumer \| Accruing Loans Greater Than 90 Days Past Due \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	$ 352	$ 286

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Amount of financing receivable on nonaccrual status with no allowance for credit loss.

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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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