LOANS AND CREDIT QUALITY (Class and Credit Indicator) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	$ 244,650		$ 390,636
Fiscal year before current fiscal year	374,423		954,656
Two years before current fiscal year	883,875		1,130,252
Three years before current fiscal year	1,079,161		628,071
Four years before current fiscal year	598,156		349,235
Five years before current fiscal year	1,442,055		1,188,666
Amortized Cost of Revolving Loans	761,324		797,466
Total	5,383,644		5,438,982
Loans and leases, gross	5,384,069		5,439,215
Net deferred costs (income)	(425)		(233)
Total loans, net of deferred fees and costs	5,383,644		5,438,982
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	24	$ 0
Year-to-date gross charge-offs, fiscal year before current fiscal year	466	2,957
Year-to-date gross charge-offs, two years before current fiscal year	5,740	2,818
Year-to-date gross charge-offs, three years before current fiscal year	2,502	345
Year-to-date gross charge-offs, four years before current fiscal year	296	616
Year-to-date gross charge-offs, five years before current fiscal year	1,640	964
Year-to-date gross charge-offs, Total	10,668	7,700
Real Estate
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	0
Year-to-date gross charge-offs, fiscal year before current fiscal year	0
Year-to-date gross charge-offs, two years before current fiscal year	76
Year-to-date gross charge-offs, three years before current fiscal year	0
Year-to-date gross charge-offs, four years before current fiscal year	0
Year-to-date gross charge-offs, five years before current fiscal year	208
Year-to-date gross charge-offs, Total	284
Real Estate | Construction
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	791		8,434
Fiscal year before current fiscal year	13,053		52,596
Two years before current fiscal year	52,375		69,607
Three years before current fiscal year	60,724		18,878
Four years before current fiscal year	13,376		2,136
Five years before current fiscal year	31,203		31,090
Amortized Cost of Revolving Loans	0		2,778
Total	171,522		185,519
Loans and leases, gross	171,918		185,994
Real Estate | Construction | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	791		8,434
Fiscal year before current fiscal year	13,053		52,596
Two years before current fiscal year	52,375		69,203
Three years before current fiscal year	60,724		18,878
Four years before current fiscal year	13,376		2,136
Five years before current fiscal year	31,203		31,090
Amortized Cost of Revolving Loans	0		2,778
Total	171,522		185,115
Real Estate | Construction | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year			0
Fiscal year before current fiscal year			0
Two years before current fiscal year			404
Three years before current fiscal year			0
Four years before current fiscal year			0
Five years before current fiscal year			0
Amortized Cost of Revolving Loans			0
Total			404
Real Estate | Residential Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	37,641		101,473
Fiscal year before current fiscal year	95,295		267,371
Two years before current fiscal year	266,078		609,947
Three years before current fiscal year	602,993		415,361
Four years before current fiscal year	406,707		145,130
Five years before current fiscal year	504,463		388,507
Amortized Cost of Revolving Loans	0		0
Total	1,913,177		1,927,789
Loans and leases, gross	1,912,753		1,927,206
Real Estate | Residential Mortgage | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	37,641		101,473
Fiscal year before current fiscal year	95,295		266,314
Two years before current fiscal year	264,381		609,648
Three years before current fiscal year	602,347		414,430
Four years before current fiscal year	404,839		144,312
Five years before current fiscal year	498,253		385,452
Amortized Cost of Revolving Loans	0		0
Total	1,902,756		1,921,629
Real Estate | Residential Mortgage | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		0
Fiscal year before current fiscal year	0		0
Two years before current fiscal year	0		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		0
Five years before current fiscal year	247		268
Amortized Cost of Revolving Loans	0		0
Total	247		268
Real Estate | Residential Mortgage | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		0
Fiscal year before current fiscal year	0		1,057
Two years before current fiscal year	1,697		299
Three years before current fiscal year	646		931
Four years before current fiscal year	1,868		818
Five years before current fiscal year	5,963		2,787
Amortized Cost of Revolving Loans	0		0
Total	10,174		5,892
Real Estate | Home Equity
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	661		12,229
Fiscal year before current fiscal year	11,619		32,208
Two years before current fiscal year	30,352		19,589
Three years before current fiscal year	18,589		8,766
Four years before current fiscal year	7,880		6,438
Five years before current fiscal year	26,752		18,377
Amortized Cost of Revolving Loans	610,958		638,917
Total	706,811		736,524
Loans and leases, gross	704,836		734,500
Real Estate | Home Equity | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	661		12,229
Fiscal year before current fiscal year	11,619		32,208
Two years before current fiscal year	30,352		19,589
Three years before current fiscal year	18,589		8,766
Four years before current fiscal year	7,880		6,372
Five years before current fiscal year	25,505		17,379
Amortized Cost of Revolving Loans	610,823		638,917
Total	705,429		735,460
Real Estate | Home Equity | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		0
Fiscal year before current fiscal year	0		0
Two years before current fiscal year	0		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		66
Five years before current fiscal year	1,247		998
Amortized Cost of Revolving Loans	135		0
Total	1,382		1,064
Real Estate | Commercial Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	106,586		96,479
Fiscal year before current fiscal year	96,430		256,660
Two years before current fiscal year	238,556		205,520
Three years before current fiscal year	203,517		115,055
Four years before current fiscal year	113,069		124,745
Five years before current fiscal year	700,651		578,132
Amortized Cost of Revolving Loans	6,561		6,311
Total	1,465,370		1,382,902
Loans and leases, gross	1,467,273		1,384,579
Real Estate | Commercial Mortgage | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	106,586		96,479
Fiscal year before current fiscal year	95,806		256,660
Two years before current fiscal year	238,556		202,933
Three years before current fiscal year	200,970		115,055
Four years before current fiscal year	113,069		112,578
Five years before current fiscal year	689,968		566,325
Amortized Cost of Revolving Loans	6,561		6,311
Total	1,451,516		1,356,341
Real Estate | Commercial Mortgage | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		0
Fiscal year before current fiscal year	624		0
Two years before current fiscal year	0		0
Three years before current fiscal year	1,450		0
Four years before current fiscal year	0		10,513
Five years before current fiscal year	5,254		9,638
Amortized Cost of Revolving Loans	0		0
Total	7,328		20,151
Real Estate | Commercial Mortgage | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		0
Fiscal year before current fiscal year	0		0
Two years before current fiscal year	0		2,587
Three years before current fiscal year	1,097		0
Four years before current fiscal year	0		1,654
Five years before current fiscal year	5,429		2,169
Amortized Cost of Revolving Loans	0		0
Total	6,526		6,410
Consumer
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	16,203		88,651
Fiscal year before current fiscal year	91,523		261,983
Two years before current fiscal year	212,669		144,546
Three years before current fiscal year	115,771		36,518
Four years before current fiscal year	27,790		28,053
Five years before current fiscal year	25,407		11,650
Amortized Cost of Revolving Loans	52,545		59,140
Total	541,908		630,541
Loans and leases, gross	542,241		630,898
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	5	0
Year-to-date gross charge-offs, fiscal year before current fiscal year	392	2,745
Year-to-date gross charge-offs, two years before current fiscal year	5,460	2,730
Year-to-date gross charge-offs, three years before current fiscal year	2,318	345
Year-to-date gross charge-offs, four years before current fiscal year	283	409
Year-to-date gross charge-offs, five years before current fiscal year	725	330
Year-to-date gross charge-offs, Total	9,183	6,559
Consumer | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	16,203		88,593
Fiscal year before current fiscal year	91,475		261,752
Two years before current fiscal year	212,509		144,341
Three years before current fiscal year	115,566		36,431
Four years before current fiscal year	27,775		27,970
Five years before current fiscal year	24,351		10,538
Amortized Cost of Revolving Loans	52,545		59,130
Total	540,424		628,755
Consumer | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		58
Fiscal year before current fiscal year	48		231
Two years before current fiscal year	160		205
Three years before current fiscal year	205		87
Four years before current fiscal year	15		83
Five years before current fiscal year	1,056		1,084
Amortized Cost of Revolving Loans	0		10
Total	1,484		1,758
Consumer | Loss
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year			0
Fiscal year before current fiscal year			0
Two years before current fiscal year			0
Three years before current fiscal year			0
Four years before current fiscal year			0
Five years before current fiscal year			28
Amortized Cost of Revolving Loans			0
Total			28
Commercial and industrial
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	82,768		83,370
Fiscal year before current fiscal year	66,503		83,838
Two years before current fiscal year	83,845		81,043
Three years before current fiscal year	77,567		33,493
Four years before current fiscal year	29,334		42,733
Five years before current fiscal year	153,579		160,910
Amortized Cost of Revolving Loans	91,260		90,320
Total	584,856		575,707
Loans and leases, gross	585,048		576,038
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	19	0
Year-to-date gross charge-offs, fiscal year before current fiscal year	74	212
Year-to-date gross charge-offs, two years before current fiscal year	204	88
Year-to-date gross charge-offs, three years before current fiscal year	184	0
Year-to-date gross charge-offs, four years before current fiscal year	13	207
Year-to-date gross charge-offs, five years before current fiscal year	707	634
Year-to-date gross charge-offs, Total	1,201	$ 1,141
Commercial and industrial | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	82,768		83,333
Fiscal year before current fiscal year	66,377		82,649
Two years before current fiscal year	80,033		77,551
Three years before current fiscal year	74,516		32,831
Four years before current fiscal year	28,777		42,162
Five years before current fiscal year	152,988		152,940
Amortized Cost of Revolving Loans	91,260		90,177
Total	576,719		561,643
Commercial and industrial | Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		0
Fiscal year before current fiscal year	33		0
Two years before current fiscal year	3,775		2,916
Three years before current fiscal year	2,910		0
Four years before current fiscal year	0		0
Five years before current fiscal year	0		944
Amortized Cost of Revolving Loans	0		93
Total	6,718		3,953
Commercial and industrial | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0		37
Fiscal year before current fiscal year	93		1,189
Two years before current fiscal year	37		576
Three years before current fiscal year	141		662
Four years before current fiscal year	557		571
Five years before current fiscal year	591		7,026
Amortized Cost of Revolving Loans	0		50
Total	$ 1,419		$ 10,111