LOANS AND CREDIT QUALITY (Aging of Recorded Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	$ 7,194	$ 6,192
Total Past Due and Nonaccrual	17,060	15,390
Loans and Leases Not Past Due	5,120,789	4,948,723
Total loans, net of allowance for credit losses	5,137,849	4,964,113
Nonaccrual Loans With No ACL	4,992	4,639
Accruing Loans 30 - 59 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	3,951	6,443
Accruing Loans 60 - 89 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,131	1,948
Accruing Loans Greater Than 90 Days Past Due
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	4,784	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	597,819	416,375
Total loans, net of allowance for credit losses	597,819	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	1,412	1,461
Total Past Due and Nonaccrual	1,745	2,424
Loans and Leases Not Past Due	512,444	542,667
Total loans, net of allowance for credit losses	514,189	545,091
Nonaccrual Loans With No ACL	0	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	279	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	54	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	137,976	125,407
Total loans, net of allowance for credit losses	137,976	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	4,553	4,115
Total Past Due and Nonaccrual	11,469	8,203
Loans and Leases Not Past Due	1,676,044	1,682,009
Total loans, net of allowance for credit losses	1,687,513	1,690,212
Nonaccrual Loans With No ACL	4,553	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	2,122	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	272	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	4,522	567
Home Equity \| Real Estate
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	439	524
Total Past Due and Nonaccrual	574	800
Loans and Leases Not Past Due	558,940	550,466
Total loans, net of allowance for credit losses	559,514	551,266
Nonaccrual Loans With No ACL	439	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	0	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	135	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	1,164,338	1,156,328
Total loans, net of allowance for credit losses	1,164,338	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 \| U.S. Mainland Consumer - Unsecured
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Nonaccrual Loans	790	92
Total Past Due and Nonaccrual	3,272	3,963
Loans and Leases Not Past Due	473,228	475,471
Total loans, net of allowance for credit losses	476,500	479,434
Nonaccrual Loans With No ACL	0	0
Consumer \| Accruing Loans 30 - 59 Days Past Due \| U.S. Mainland Consumer - Unsecured
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	1,550	2,725
Consumer \| Accruing Loans 60 - 89 Days Past Due \| U.S. Mainland Consumer - Unsecured
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	670	906
Consumer \| Accruing Loans Greater Than 90 Days Past Due \| U.S. Mainland Consumer - Unsecured
Aging Analysis of Accruing and Non-Accruing Loans and Leases
Past Due, Accuing Loans	$ 262	$ 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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