LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	$ 7,237	$ 6,192
Total Past Due and Nonaccrual	11,794	15,390
Loans and Leases Not Past Due	5,034,003	4,948,723
Total loans, net of allowance for credit losses	5,045,797	4,964,113
Nonaccrual Loans With No ACL	6,418	4,639
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	2,404	6,443
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,543	1,948
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	610	807
Small Business Administration Paycheck Protection Program \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	0
Loans and Leases Not Past Due	218,671	416,375
Total loans, net of allowance for credit losses	218,671	416,375
Nonaccrual Loans With No ACL	0	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	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	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	0
Other \| Commercial Financial And Agricultural
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	689	1,461
Total Past Due and Nonaccrual	1,293	2,424
Loans and Leases Not Past Due	517,580	542,667
Total loans, net of allowance for credit losses	518,873	545,091
Nonaccrual Loans With No ACL	188	0
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	407	613
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	197	350
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	0
Construction \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	0	0
Total Past Due and Nonaccrual	0	0
Loans and Leases Not Past Due	128,908	125,407
Total loans, net of allowance for credit losses	128,908	125,407
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	0
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	5,351	4,115
Total Past Due and Nonaccrual	6,650	8,203
Loans and Leases Not Past Due	1,742,079	1,682,009
Total loans, net of allowance for credit losses	1,748,729	1,690,212
Nonaccrual Loans With No ACL	5,350	4,115
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	0	2,832
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	855	689
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	444	567
Home Equity \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	880	524
Total Past Due and Nonaccrual	1,157	800
Loans and Leases Not Past Due	617,794	550,466
Total loans, net of allowance for credit losses	618,951	551,266
Nonaccrual Loans With No ACL	880	524
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	83	273
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	194	3
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	269	0
Loans and Leases Not Past Due	1,208,148	1,156,328
Total loans, net of allowance for credit losses	1,208,417	1,156,328
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	269	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	0
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	317	92
Total Past Due and Nonaccrual	2,425	3,963
Loans and Leases Not Past Due	600,823	475,471
Total loans, net of allowance for credit losses	603,248	479,434
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	1,645	2,725
Consumer \| Accruing Loans 60 - 89 Days Past Due \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	297	906
Consumer \| Accruing Loans Greater Than 90 Days Past Due \| Consumer
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	$ 166	$ 240

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