LOANS AND CREDIT QUALITY (Class and Credit Indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	$ 455,200	$ 503,449
Fiscal year before current fiscal year	557,032	531,733
Two years before current fiscal year	443,935	302,328
Three years before current fiscal year	233,886	678,867
Four years before current fiscal year	581,986	922,561
Five years before current fiscal year	2,400,605	1,690,343
Amortized Cost of Revolving Loans	640,426	659,815
Loans	5,313,070	5,289,096
Commercial and industrial
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	52,733	63,780
Fiscal year before current fiscal year	42,249	168,128
Two years before current fiscal year	155,411	37,272
Three years before current fiscal year	29,187	56,913
Four years before current fiscal year	49,705	48,038
Five years before current fiscal year	136,137	116,471
Amortized Cost of Revolving Loans	113,152	103,990
Loans	578,574	594,592
Commercial and industrial \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	51,041	63,780
Fiscal year before current fiscal year	41,575	166,412
Two years before current fiscal year	153,174	34,598
Three years before current fiscal year	27,593	56,913
Four years before current fiscal year	49,705	47,935
Five years before current fiscal year	135,437	115,991
Amortized Cost of Revolving Loans	112,854	103,393
Loans	571,379	589,022
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	436	660
Two years before current fiscal year	990	1,869
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	0
Amortized Cost of Revolving Loans	298	0
Loans	1,724	2,529
Commercial and industrial \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	1,692	0
Fiscal year before current fiscal year	238	1,056
Two years before current fiscal year	1,247	805
Three years before current fiscal year	1,594	0
Four years before current fiscal year	0	103
Five years before current fiscal year	700	480
Amortized Cost of Revolving Loans	0	597
Loans	5,471	3,041
Real Estate Portfolio Segment \| Construction
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	3,763	57,887
Fiscal year before current fiscal year	122,768	24,133
Two years before current fiscal year	30,607	24,091
Three years before current fiscal year	0	48,970
Four years before current fiscal year	7,575	17,741
Five years before current fiscal year	52,431	40,369
Amortized Cost of Revolving Loans	0	0
Loans	217,144	213,191
Real Estate Portfolio Segment \| Construction \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	3,763	57,887
Fiscal year before current fiscal year	122,768	24,133
Two years before current fiscal year	30,607	24,091
Three years before current fiscal year	0	48,970
Four years before current fiscal year	7,575	17,741
Five years before current fiscal year	31,736	40,369
Amortized Cost of Revolving Loans	0	0
Loans	196,449	213,191
Real Estate Portfolio Segment \| Construction \| Substandard
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	20,695
Amortized Cost of Revolving Loans	0
Loans	20,695
Real Estate Portfolio Segment \| Residential Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	96,858	95,400
Fiscal year before current fiscal year	87,097	72,780
Two years before current fiscal year	51,832	79,628
Three years before current fiscal year	71,051	239,642
Four years before current fiscal year	225,419	556,932
Five years before current fiscal year	1,270,091	794,809
Amortized Cost of Revolving Loans	0	0
Loans	1,802,348	1,839,191
Real Estate Portfolio Segment \| Residential Mortgage \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	96,858	95,400
Fiscal year before current fiscal year	87,097	72,780
Two years before current fiscal year	51,832	79,382
Three years before current fiscal year	70,817	237,379
Four years before current fiscal year	224,102	556,527
Five years before current fiscal year	1,262,022	786,487
Amortized Cost of Revolving Loans	0	0
Loans	1,792,728	1,827,955
Real Estate Portfolio Segment \| 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	0
Two years before current fiscal year	0	246
Three years before current fiscal year	234	2,263
Four years before current fiscal year	1,317	405
Five years before current fiscal year	8,069	8,322
Amortized Cost of Revolving Loans	0	0
Loans	9,620	11,236
Real Estate Portfolio Segment \| Home Equity
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	106	416
Fiscal year before current fiscal year	333	988
Two years before current fiscal year	1,209	12,129
Three years before current fiscal year	10,166	25,112
Four years before current fiscal year	23,149	15,989
Five years before current fiscal year	46,901	33,338
Amortized Cost of Revolving Loans	486,250	512,110
Loans	568,114	600,082
Real Estate Portfolio Segment \| Home Equity \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	106	416
Fiscal year before current fiscal year	333	988
Two years before current fiscal year	1,209	10,944
Three years before current fiscal year	8,977	25,112
Four years before current fiscal year	23,149	15,989
Five years before current fiscal year	46,901	31,915
Amortized Cost of Revolving Loans	484,766	511,625
Loans	565,441	596,989
Real Estate Portfolio Segment \| 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	1,185
Three years before current fiscal year	1,189	0
Four years before current fiscal year	0	0
Five years before current fiscal year	0	1,423
Amortized Cost of Revolving Loans	1,484	485
Loans	2,673	3,093
Real Estate Portfolio Segment \| Commercial Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	259,294	204,072
Fiscal year before current fiscal year	189,417	179,962
Two years before current fiscal year	132,828	94,900
Three years before current fiscal year	88,906	210,127
Four years before current fiscal year	212,456	212,255
Five years before current fiscal year	830,113	687,346
Amortized Cost of Revolving Loans	0	5,771
Loans	1,713,014	1,594,433
Real Estate Portfolio Segment \| Commercial Mortgage \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	259,294	204,072
Fiscal year before current fiscal year	189,417	146,975
Two years before current fiscal year	95,518	92,107
Three years before current fiscal year	86,739	204,149
Four years before current fiscal year	206,029	210,061
Five years before current fiscal year	820,774	681,060
Amortized Cost of Revolving Loans	0	5,771
Loans	1,657,771	1,544,195
Real Estate Portfolio Segment \| 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	0	0
Two years before current fiscal year	1,967	593
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	2,030	471
Amortized Cost of Revolving Loans	0	0
Loans	3,997	1,064
Real Estate Portfolio Segment \| 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	32,987
Two years before current fiscal year	35,343	2,200
Three years before current fiscal year	2,167	5,978
Four years before current fiscal year	6,427	2,194
Five years before current fiscal year	7,309	5,815
Amortized Cost of Revolving Loans	0	0
Loans	51,246	49,174
Consumer
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	42,446	81,894
Fiscal year before current fiscal year	115,168	85,742
Two years before current fiscal year	72,048	54,308
Three years before current fiscal year	34,576	98,103
Four years before current fiscal year	63,682	71,606
Five years before current fiscal year	64,932	18,010
Amortized Cost of Revolving Loans	41,024	37,944
Loans	433,876	447,607
Consumer \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	42,426	81,799
Fiscal year before current fiscal year	114,963	85,641
Two years before current fiscal year	71,950	54,227
Three years before current fiscal year	34,489	97,994
Four years before current fiscal year	63,585	71,458
Five years before current fiscal year	64,313	17,527
Amortized Cost of Revolving Loans	41,024	37,944
Loans	432,750	446,590
Consumer \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	20	95
Fiscal year before current fiscal year	205	101
Two years before current fiscal year	98	81
Three years before current fiscal year	87	109
Four years before current fiscal year	97	148
Five years before current fiscal year	619	483
Amortized Cost of Revolving Loans	0	0
Loans	$ 1,126	$ 1,017

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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