LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Loan Aging Analysis by Portfolio Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 6,867	$ 8,787
Current	3,230,179	3,211,035
Total Loans Outstanding	3,237,046	3,219,822	$ 3,157,762
Loans 90 Days Past Due and Accruing	0	0
Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	208	223
Current	1,116,409	1,097,752
Total Loans Outstanding	1,116,617	1,097,975
Loans 90 Days Past Due and Accruing	0	0
Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	122	146
Current	273,588	271,349
Total Loans Outstanding	273,710	271,495
Loans 90 Days Past Due and Accruing		0
Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,447	1,287
Current	364,712	380,207
Total Loans Outstanding	366,159	381,494	463,087
Loans 90 Days Past Due and Accruing	0	0
SBA PPP Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	169,407	135,095
Total Loans Outstanding	169,407	135,095
Loans 90 Days Past Due and Accruing	0	0
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,479	5,044
Current	1,048,286	1,049,754
Total Loans Outstanding	1,051,765	1,054,798	1,064,212
Loans 90 Days Past Due and Accruing	0	0
Home Equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,539	1,924
Current	238,947	256,649
Total Loans Outstanding	240,486	258,573	306,226
Loans 90 Days Past Due and Accruing	0	0
Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	72	163
Current	18,830	20,229
Total Loans Outstanding	18,902	20,392	$ 24,377
Loans 90 Days Past Due and Accruing	0	0
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,006	2,362
30-59 Days Past Due | Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	102	0
30-59 Days Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	0	99
30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	425	430
30-59 Days Past Due | SBA PPP Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
30-59 Days Past Due | Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	423	1,406
30-59 Days Past Due | Home Equity
Financing Receivable, Past Due [Line Items]
Total Past Due	35	335
30-59 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	21	92
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	803	1,393
60-89 Days Past Due | Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	0	50
60-89 Days Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	75	0
60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due | SBA PPP Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
60-89 Days Past Due | Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	514	1,103
60-89 Days Past Due | Home Equity
Financing Receivable, Past Due [Line Items]
Total Past Due	192	173
60-89 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	22	67
90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,058	5,032
90 Days or Greater Past Due | Commercial real estate - non owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	106	173
90 Days or Greater Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Total Past Due	47	47
90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,022	857
90 Days or Greater Past Due | SBA PPP Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
90 Days or Greater Past Due | Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	2,542	2,535
90 Days or Greater Past Due | Home Equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,312	1,416
90 Days or Greater Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 29	$ 4