LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Loan Aging Analysis by Portfolio Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans outstanding	$ 4,121,040	$ 4,098,094
Loans 90 Days Past Due and Accruing	0	0
Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,402,326	1,370,446
Loans 90 Days Past Due and Accruing	0	0
Gross loans	1,402,326	1,370,446
Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	300,626	301,860
Loans 90 Days Past Due and Accruing		0
Gross loans	300,626	301,860
Commercial
Financing Receivable, Past Due [Line Items]
Loans outstanding	397,395	403,901
Loans 90 Days Past Due and Accruing	0	0
Gross loans	397,395	403,901
Residential real estate
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,762,482	1,763,378
Loans 90 Days Past Due and Accruing	0	0
Gross loans	1,762,482	1,763,378
Home equity
Financing Receivable, Past Due [Line Items]
Loans outstanding	240,674	240,341
Loans 90 Days Past Due and Accruing	0	0
Gross loans	240,674	240,341
Consumer
Financing Receivable, Past Due [Line Items]
Loans outstanding	17,537	18,168
Loans 90 Days Past Due and Accruing	0	0
Gross loans	17,537	18,168
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans outstanding	4,560	8,535
Total Past Due | Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	7	269
Total Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	92	655
Total Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,169	3,507
Total Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,993	2,733
Total Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,242	1,273
Total Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Loans outstanding	57	98
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans outstanding	2,018	3,775
30-59 Days Past Due | Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	0	44
30-59 Days Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	92	655
30-59 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Loans outstanding	346	1,153
30-59 Days Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans outstanding	834	1,317
30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans outstanding	696	521
30-59 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Loans outstanding	50	85
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans outstanding	778	2,021
60-89 Days Past Due | Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	0	41
60-89 Days Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	0	0
60-89 Days Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Loans outstanding	203	1,199
60-89 Days Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans outstanding	192	322
60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans outstanding	382	451
60-89 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Loans outstanding	1	8
90 Days or Greater Past Due
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,764	2,739
90 Days or Greater Past Due | Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	7	184
90 Days or Greater Past Due | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	0	0
90 Days or Greater Past Due | Commercial
Financing Receivable, Past Due [Line Items]
Loans outstanding	620	1,155
90 Days or Greater Past Due | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans outstanding	967	1,094
90 Days or Greater Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Loans outstanding	164	301
90 Days or Greater Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Loans outstanding	6	5
Current
Financing Receivable, Past Due [Line Items]
Loans outstanding	4,116,480	4,089,559
Current | Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,402,319	1,370,177
Current | Commercial real estate - owner-occupied
Financing Receivable, Past Due [Line Items]
Loans outstanding	300,534	301,205
Current | Commercial
Financing Receivable, Past Due [Line Items]
Loans outstanding	396,226	400,394
Current | Residential real estate
Financing Receivable, Past Due [Line Items]
Loans outstanding	1,760,489	1,760,645
Current | Home equity
Financing Receivable, Past Due [Line Items]
Loans outstanding	239,432	239,068
Current | Consumer
Financing Receivable, Past Due [Line Items]
Loans outstanding	17,480	18,070
Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	6,841	42,164
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39,972	54,911
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	52,815	56,550
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	53,786	25,302
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	23,904	26,575
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	60,393	36,897
Financing Receivable, Revolving	124,587	122,194
Financing Receivable, Revolving, Converted to Term Loan	35,097	39,308
Gross loans	397,395	403,901
Commercial | Doubtful
Financing Receivable, Past Due [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Gross loans	0	0
Residential real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	24,318	160,315
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	165,392	539,835
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	533,172	541,943
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	532,981	220,943
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	217,904	71,006
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	287,958	228,580
Financing Receivable, Revolving	377	370
Financing Receivable, Revolving, Converted to Term Loan	380	386
Gross loans	1,762,482	1,763,378
Residential real estate | Doubtful
Financing Receivable, Past Due [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Gross loans	0	0
Commercial real estate - non-owner-occupied
Financing Receivable, Past Due [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	25,479	111,756
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	118,361	365,227
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	373,465	296,152
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	298,334	149,344
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	147,138	116,924
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	439,549	331,043
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Gross loans	1,402,326	1,370,446
Commercial real estate - non-owner-occupied | Doubtful
Financing Receivable, Past Due [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	0	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Revolving, Converted to Term Loan	0	0
Gross loans	$ 0	$ 0