LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	$ 6,745	$ 6,192
Total Past Due and Nonaccrual	12,149	15,390
Loans and Leases Not Past Due	5,065,169	4,948,723
Total loans, net of allowance for credit losses	5,077,318	4,964,113
Nonaccrual Loans With No ACL	5,938	4,639
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	2,193	6,443
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,644	1,948
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,567	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	434,610	416,375
Total loans, net of allowance for credit losses	434,610	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	699	1,461
Total Past Due and Nonaccrual	1,312	2,424
Loans and Leases Not Past Due	484,913	542,667
Total loans, net of allowance for credit losses	486,225	545,091
Nonaccrual Loans With No ACL	220	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	517	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	67	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	29	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	133,457	125,407
Total loans, net of allowance for credit losses	133,457	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	5,280	4,115
Total Past Due and Nonaccrual	7,721	8,203
Loans and Leases Not Past Due	1,704,080	1,682,009
Total loans, net of allowance for credit losses	1,711,801	1,690,212
Nonaccrual Loans With No ACL	5,284	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	1,003	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	1,438	567
Home Equity \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	434	524
Total Past Due and Nonaccrual	838	800
Loans and Leases Not Past Due	582,592	550,466
Total loans, net of allowance for credit losses	583,430	551,266
Nonaccrual Loans With No ACL	434	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	331	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	73	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	0	0
Loans and Leases Not Past Due	1,186,430	1,156,328
Total loans, net of allowance for credit losses	1,186,430	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	0	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	332	92
Total Past Due and Nonaccrual	2,278	3,963
Loans and Leases Not Past Due	539,087	475,471
Total loans, net of allowance for credit losses	541,365	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	1,345	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	501	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	$ 100	$ 240

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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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