LOANS AND CREDIT QUALITY (Class and Credit Indicator) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	$ 344,914		$ 390,636
Fiscal year before current fiscal year	369,976		954,656
Two years before current fiscal year	847,392		1,130,252
Three years before current fiscal year	1,055,786		628,071
Four years before current fiscal year	586,077		349,235
Five years before current fiscal year	1,385,050		1,188,666
Amortized Cost of Revolving Loans	753,414		797,466
Total	5,342,609		5,438,982
Loans and leases, gross	5,343,024		5,439,215
Net deferred costs (income)	(415)		(233)
Total loans, net of deferred fees and costs	5,342,609		5,438,982
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	144	$ 147
Year-to-date gross charge-offs, fiscal year before current fiscal year	668	5,227
Year-to-date gross charge-offs, two years before current fiscal year	8,360	4,303
Year-to-date gross charge-offs, three years before current fiscal year	3,446	871
Year-to-date gross charge-offs, four years before current fiscal year	441	892
Year-to-date gross charge-offs, five years before current fiscal year	2,327	1,372
Year-to-date gross charge-offs, Total	15,386	12,812
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	175
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	383
Real Estate | Construction
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	6,508		8,434
Fiscal year before current fiscal year	19,346		52,596
Two years before current fiscal year	47,954		69,607
Three years before current fiscal year	35,859		18,878
Four years before current fiscal year	13,342		2,136
Five years before current fiscal year	35,117		31,090
Amortized Cost of Revolving Loans	0		2,778
Total	158,126		185,519
Loans and leases, gross	158,523		185,994
Real Estate | Construction | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	6,508		8,434
Fiscal year before current fiscal year	19,346		52,596
Two years before current fiscal year	47,954		69,203
Three years before current fiscal year	35,859		18,878
Four years before current fiscal year	13,342		2,136
Five years before current fiscal year	35,117		31,090
Amortized Cost of Revolving Loans	0		2,778
Total	158,126		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	55,009		101,473
Fiscal year before current fiscal year	92,858		267,371
Two years before current fiscal year	263,248		609,947
Three years before current fiscal year	596,644		415,361
Four years before current fiscal year	402,407		145,130
Five years before current fiscal year	487,753		388,507
Amortized Cost of Revolving Loans	0		0
Total	1,897,919		1,927,789
Loans and leases, gross	1,897,526		1,927,206
Real Estate | Residential Mortgage | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	55,009		101,473
Fiscal year before current fiscal year	92,858		266,314
Two years before current fiscal year	261,649		609,648
Three years before current fiscal year	596,350		414,430
Four years before current fiscal year	400,545		144,312
Five years before current fiscal year	480,913		385,452
Amortized Cost of Revolving Loans	0		0
Total	1,887,324		1,921,629
Real Estate | Residential Mortgage | 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			0
Three years before current fiscal year			0
Four years before current fiscal year			0
Five years before current fiscal year			268
Amortized Cost of Revolving Loans			0
Total			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	1,599		299
Three years before current fiscal year	294		931
Four years before current fiscal year	1,862		818
Five years before current fiscal year	6,840		2,787
Amortized Cost of Revolving Loans	0		0
Total	10,595		5,892
Real Estate | Home Equity
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	1,231		12,229
Fiscal year before current fiscal year	11,997		32,208
Two years before current fiscal year	29,158		19,589
Three years before current fiscal year	18,224		8,766
Four years before current fiscal year	7,611		6,438
Five years before current fiscal year	25,333		18,377
Amortized Cost of Revolving Loans	603,569		638,917
Total	697,123		736,524
Loans and leases, gross	695,175		734,500
Real Estate | Home Equity | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	1,231		12,229
Fiscal year before current fiscal year	11,997		32,208
Two years before current fiscal year	29,158		19,589
Three years before current fiscal year	18,224		8,766
Four years before current fiscal year	7,611		6,372
Five years before current fiscal year	24,418		17,379
Amortized Cost of Revolving Loans	603,434		638,917
Total	696,073		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	915		998
Amortized Cost of Revolving Loans	135		0
Total	1,050		1,064
Real Estate | Commercial Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	122,037		96,479
Fiscal year before current fiscal year	96,185		256,660
Two years before current fiscal year	238,401		205,520
Three years before current fiscal year	227,702		115,055
Four years before current fiscal year	112,347		124,745
Five years before current fiscal year	667,727		578,132
Amortized Cost of Revolving Loans	5,911		6,311
Total	1,470,310		1,382,902
Loans and leases, gross	1,472,230		1,384,579
Real Estate | Commercial Mortgage | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	122,037		96,479
Fiscal year before current fiscal year	95,562		256,660
Two years before current fiscal year	238,401		202,933
Three years before current fiscal year	225,176		115,055
Four years before current fiscal year	112,347		112,578
Five years before current fiscal year	657,231		566,325
Amortized Cost of Revolving Loans	5,911		6,311
Total	1,456,665		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	623		0
Two years before current fiscal year	0		0
Three years before current fiscal year	1,438		0
Four years before current fiscal year	0		10,513
Five years before current fiscal year	5,185		9,638
Amortized Cost of Revolving Loans	0		0
Total	7,246		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	1,088		0
Four years before current fiscal year	0		1,654
Five years before current fiscal year	5,311		2,169
Amortized Cost of Revolving Loans	0		0
Total	6,399		6,410
Consumer
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	32,656		88,651
Fiscal year before current fiscal year	91,878		261,983
Two years before current fiscal year	192,439		144,546
Three years before current fiscal year	103,287		36,518
Four years before current fiscal year	24,083		28,053
Five years before current fiscal year	19,731		11,650
Amortized Cost of Revolving Loans	55,610		59,140
Total	519,684		630,541
Loans and leases, gross	520,014		630,898
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	75	4
Year-to-date gross charge-offs, fiscal year before current fiscal year	518	4,988
Year-to-date gross charge-offs, two years before current fiscal year	7,944	4,158
Year-to-date gross charge-offs, three years before current fiscal year	3,243	871
Year-to-date gross charge-offs, four years before current fiscal year	408	627
Year-to-date gross charge-offs, five years before current fiscal year	951	621
Year-to-date gross charge-offs, Total	13,139	11,269
Consumer | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	32,636		88,593
Fiscal year before current fiscal year	91,838		261,752
Two years before current fiscal year	192,185		144,341
Three years before current fiscal year	103,112		36,431
Four years before current fiscal year	24,048		27,970
Five years before current fiscal year	19,153		10,538
Amortized Cost of Revolving Loans	55,605		59,130
Total	518,577		628,755
Consumer | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	20		58
Fiscal year before current fiscal year	40		231
Two years before current fiscal year	254		205
Three years before current fiscal year	175		87
Four years before current fiscal year	35		83
Five years before current fiscal year	578		1,084
Amortized Cost of Revolving Loans	5		10
Total	1,107		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	127,473		83,370
Fiscal year before current fiscal year	57,712		83,838
Two years before current fiscal year	76,192		81,043
Three years before current fiscal year	74,070		33,493
Four years before current fiscal year	26,287		42,733
Five years before current fiscal year	149,389		160,910
Amortized Cost of Revolving Loans	88,324		90,320
Total	599,447		575,707
Loans and leases, gross	599,556		576,038
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	69	143
Year-to-date gross charge-offs, fiscal year before current fiscal year	150	239
Year-to-date gross charge-offs, two years before current fiscal year	241	145
Year-to-date gross charge-offs, three years before current fiscal year	203	0
Year-to-date gross charge-offs, four years before current fiscal year	33	265
Year-to-date gross charge-offs, five years before current fiscal year	1,168	751
Year-to-date gross charge-offs, Total	1,864	$ 1,543
Commercial and industrial | Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	125,093		83,333
Fiscal year before current fiscal year	56,889		82,649
Two years before current fiscal year	75,837		77,551
Three years before current fiscal year	71,370		32,831
Four years before current fiscal year	26,287		42,162
Five years before current fiscal year	149,077		152,940
Amortized Cost of Revolving Loans	88,324		90,177
Total	592,877		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	587		0
Two years before current fiscal year	297		2,916
Three years before current fiscal year	2,579		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	3,463		3,953
Commercial and industrial | Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	2,380		37
Fiscal year before current fiscal year	236		1,189
Two years before current fiscal year	58		576
Three years before current fiscal year	121		662
Four years before current fiscal year	0		571
Five years before current fiscal year	312		7,026
Amortized Cost of Revolving Loans	0		50
Total	$ 3,107		$ 10,111