LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	$ 13,059	$ 1,555
Total Past Due and Nonaccrual	24,365	12,497
Loans and Leases Not Past Due	5,006,261	4,437,043
Total loans, net of allowance for credit losses	5,030,626	4,449,540
Nonaccrual Loans With No ACL	9,529	1,071
Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans		467
Total Past Due and Nonaccrual		1,808
Loans and Leases Not Past Due		568,496
Total loans, net of allowance for credit losses		570,304
Nonaccrual Loans With No ACL		0
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	9,065	6,931
Accruing Loans 30 - 59 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans		476
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,332	3,001
Accruing Loans 60 - 89 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans		865
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	909	1,010
Accruing Loans Greater Than 90 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans		0
Small Business Administration Paycheck Protection Program \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	0
Total Past Due and Nonaccrual	0
Loans and Leases Not Past Due	528,581
Total loans, net of allowance for credit losses	528,581
Nonaccrual Loans With No ACL	0
Small Business Administration Paycheck Protection Program \| Accruing Loans 30 - 59 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0
Small Business Administration Paycheck Protection Program \| Accruing Loans 60 - 89 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0
Small Business Administration Paycheck Protection Program \| Accruing Loans Greater Than 90 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0
Other \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	1,536
Total Past Due and Nonaccrual	6,867
Loans and Leases Not Past Due	521,203
Total loans, net of allowance for credit losses	528,070
Nonaccrual Loans With No ACL	668
Other \| Accruing Loans 30 - 59 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	5,246
Other \| Accruing Loans 60 - 89 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	85
Other \| Accruing Loans Greater Than 90 Days Past Due \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	0
Construction \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	643
Loans and Leases Not Past Due	118,247	95,211
Total loans, net of allowance for credit losses	118,247	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	0	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
Residential Mortgage \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	4,032	979
Total Past Due and Nonaccrual	5,188	4,122
Loans and Leases Not Past Due	1,674,872	1,595,679
Total loans, net of allowance for credit losses	1,680,060	1,599,801
Nonaccrual Loans With No ACL	4,032	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	12	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	556	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	588	724
Home Equity \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	533	92
Total Past Due and Nonaccrual	788	1,058
Loans and Leases Not Past Due	533,268	489,676
Total loans, net of allowance for credit losses	534,056	490,734
Nonaccrual Loans With No ACL	533	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	255	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	6,889	0
Total Past Due and Nonaccrual	8,667	397
Loans and Leases Not Past Due	1,132,598	1,123,018
Total loans, net of allowance for credit losses	1,141,265	1,123,415
Nonaccrual Loans With No ACL	4,296	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	1,778	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	69	17
Total Past Due and Nonaccrual	2,855	4,469
Loans and Leases Not Past Due	497,492	564,963
Total loans, net of allowance for credit losses	500,347	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	1,774	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	691	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	$ 321	$ 286

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

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