LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicator (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Term Loans Amortized Cost by Origination Year
2025	$ 263,845		$ 263,845		$ 260,403
2024	260,069		260,069		299,782
2023	274,505		274,505		496,016
2022	444,491		444,491		272,066
2021	252,892		252,892		192,541
Prior	501,292		501,292		380,263
Revolving Loans Amortized Cost	196,282		196,282		166,273
Revolving Loans Converted to Term	8,980		8,980		4,075
Total loans, net of deferred loan fees and costs	2,202,356		2,202,356		2,071,419
Total gross charge-offs
2025			1		52
2024			177		622
2023			447		746
2022			240		181
2021			882		99
Prior			43		152
Revolving Loans Amortized Cost			17		21
Revolving Loans Converted to Term			0		0
Total	288	$ 305	1,807	$ 1,122	1,873
Commercial and industrial
Term Loans Amortized Cost by Origination Year
2025	35,220		35,220		45,060
2024	36,873		36,873		32,419
2023	26,743		26,743		38,803
2022	29,961		29,961		17,520
2021	14,304		14,304		12,746
Prior	26,288		26,288		31,812
Revolving Loans Amortized Cost	133,499		133,499		119,401
Revolving Loans Converted to Term	6,333		6,333		1,760
Total loans, net of deferred loan fees and costs	309,221		309,221		299,521
Total gross charge-offs
2025			0		0
2024			0		84
2023			0		200
2022			0		6
2021			772		0
Prior			0		0
Revolving Loans Amortized Cost			5		12
Revolving Loans Converted to Term			0		0
Total			777		302
Commercial and industrial | Pass
Term Loans Amortized Cost by Origination Year
2025	34,611		34,611		44,130
2024	36,244		36,244		32,157
2023	26,023		26,023		34,862
2022	27,535		27,535		16,787
2021	13,728		13,728		8,326
Prior	18,060		18,060		27,452
Revolving Loans Amortized Cost	122,589		122,589		108,819
Revolving Loans Converted to Term	2,527		2,527		1,380
Total loans, net of deferred loan fees and costs	281,317		281,317		273,913
Commercial and industrial | Special mention
Term Loans Amortized Cost by Origination Year
2025	609		609		810
2024	275		275		262
2023	707		707		3,933
2022	2,426		2,426		0
2021	532		532		4,390
Prior	7,644		7,644		3,673
Revolving Loans Amortized Cost	8,189		8,189		10,203
Revolving Loans Converted to Term	3,641		3,641		62
Total loans, net of deferred loan fees and costs	24,023		24,023		23,333
Commercial and industrial | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		99
2024	334		334		0
2023	13		13		8
2022	0		0		733
2021	44		44		30
Prior	0		0		0
Revolving Loans Amortized Cost	2,721		2,721		379
Revolving Loans Converted to Term	80		80		318
Total loans, net of deferred loan fees and costs	3,192		3,192		1,567
Commercial and industrial | Doubtful
Term Loans Amortized Cost by Origination Year
2025	0		0		21
2024	20		20		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	584		584		687
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	85		85		0
Total loans, net of deferred loan fees and costs	689		689		708
Commercial Mortgages
Term Loans Amortized Cost by Origination Year
Total loans, net of deferred loan fees and costs	1,362,040		1,362,040		1,217,004
Total gross charge-offs
Total	0	0	0	0
Commercial Mortgages | Construction
Term Loans Amortized Cost by Origination Year
2025	17,456		17,456		19,344
2024	28,578		28,578		46,954
2023	37,355		37,355		17,568
2022	14,024		14,024		9,058
2021	8,882		8,882		0
Prior	1,378		1,378		1,536
Revolving Loans Amortized Cost	1,934		1,934		483
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	109,607		109,607		94,943
Total gross charge-offs
2025			0		0
2024			0		0
2023			0		0
2022			0		0
2021			0		0
Prior			0		0
Revolving Loans Amortized Cost			0		0
Revolving Loans Converted to Term			0		0
Total			0		0
Commercial Mortgages | Construction | Pass
Term Loans Amortized Cost by Origination Year
2025	17,456		17,456		19,344
2024	28,578		28,578		46,954
2023	37,355		37,355		17,568
2022	14,024		14,024		9,058
2021	8,882		8,882		0
Prior	1,378		1,378		1,536
Revolving Loans Amortized Cost	1,934		1,934		483
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	109,607		109,607		94,943
Commercial Mortgages | Construction | Special mention
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	0		0		0
Commercial Mortgages | Construction | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	0		0		0
Commercial Mortgages | Construction | Doubtful
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	0		0		0
Commercial Mortgages | Owner occupied commercial real estate
Term Loans Amortized Cost by Origination Year
2025	34,862		34,862		23,196
2024	23,473		23,473		23,651
2023	22,608		22,608		27,808
2022	26,371		26,371		21,409
2021	20,197		20,197		9,513
Prior	39,626		39,626		34,550
Revolving Loans Amortized Cost	2,734		2,734		2,097
Revolving Loans Converted to Term	43		43		55
Total loans, net of deferred loan fees and costs	169,914		169,914		142,279
Total gross charge-offs
2025			0		0
2024			0		0
2023			0		0
2022			0		0
2021			0		0
Prior			0		0
Revolving Loans Amortized Cost			0		0
Revolving Loans Converted to Term			0		0
Total			0		0
Commercial Mortgages | Owner occupied commercial real estate | Pass
Term Loans Amortized Cost by Origination Year
2025	33,651		33,651		23,196
2024	23,473		23,473		23,185
2023	17,796		17,796		26,945
2022	23,613		23,613		20,979
2021	13,613		13,613		9,513
Prior	35,043		35,043		31,222
Revolving Loans Amortized Cost	734		734		97
Revolving Loans Converted to Term	43		43		55
Total loans, net of deferred loan fees and costs	147,966		147,966		135,192
Commercial Mortgages | Owner occupied commercial real estate | Special mention
Term Loans Amortized Cost by Origination Year
2025	1,211		1,211		0
2024	0		0		370
2023	4,716		4,716		0
2022	2,269		2,269		109
2021	6,584		6,584		0
Prior	3,633		3,633		2,206
Revolving Loans Amortized Cost	2,000		2,000		2,000
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	20,413		20,413		4,685
Commercial Mortgages | Owner occupied commercial real estate | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		96
2023	96		96		863
2022	489		489		321
2021	0		0		0
Prior	944		944		1,107
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	1,529		1,529		2,387
Commercial Mortgages | Owner occupied commercial real estate | Doubtful
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	6		6		15
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	6		6		15
Commercial Mortgages | Non-owner occupied commercial real estate
Term Loans Amortized Cost by Origination Year
2025	128,042		128,042		97,155
2024	103,508		103,508		111,502
2023	120,260		120,260		273,361
2022	263,425		263,425		149,657
2021	145,662		145,662		98,842
Prior	311,805		311,805		241,792
Revolving Loans Amortized Cost	9,080		9,080		6,696
Revolving Loans Converted to Term	737		737		777
Total loans, net of deferred loan fees and costs	1,082,519		1,082,519		979,782
Total gross charge-offs
2025			0		0
2024			0		0
2023			0		0
2022			0		0
2021			0		0
Prior			0		0
Revolving Loans Amortized Cost			0		0
Revolving Loans Converted to Term			0		0
Total			0		0
Commercial Mortgages | Non-owner occupied commercial real estate | Pass
Term Loans Amortized Cost by Origination Year
2025	125,997		125,997		97,155
2024	103,508		103,508		109,354
2023	114,535		114,535		267,280
2022	247,529		247,529		141,864
2021	138,179		138,179		97,828
Prior	308,293		308,293		233,084
Revolving Loans Amortized Cost	9,080		9,080		6,696
Revolving Loans Converted to Term	737		737		777
Total loans, net of deferred loan fees and costs	1,047,858		1,047,858		954,038
Commercial Mortgages | Non-owner occupied commercial real estate | Special mention
Term Loans Amortized Cost by Origination Year
2025	2,045		2,045		0
2024	0		0		0
2023	3,555		3,555		5,935
2022	15,764		15,764		7,793
2021	7,483		7,483		0
Prior	2,901		2,901		7,833
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	31,748		31,748		21,561
Commercial Mortgages | Non-owner occupied commercial real estate | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		2,148
2023	2,170		2,170		146
2022	132		132		0
2021	0		0		1,014
Prior	611		611		875
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	2,913		2,913		4,183
Commercial Mortgages | Non-owner occupied commercial real estate | Doubtful
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	0		0		0
Commercial Mortgages | Home equity lines and loans | Special mention
Term Loans Amortized Cost by Origination Year
2025					0
2024					0
2023					115
2022					0
2021					0
Prior					0
Revolving Loans Amortized Cost					0
Revolving Loans Converted to Term					0
Total loans, net of deferred loan fees and costs					115
Residential Mortgages
Term Loans Amortized Cost by Origination Year
2025	22,492		22,492		21,574
2024	24,123		24,123		20,257
2023	19,138		19,138		55,406
2022	52,105		52,105		55,923
2021	51,780		51,780		64,691
Prior	108,091		108,091		57,128
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	277,729		277,729		274,979
Total gross charge-offs
2025			0		0
2024			0		0
2023			0		0
2022			0		0
2021			0		0
Prior			0		21
Revolving Loans Amortized Cost			0		0
Revolving Loans Converted to Term			0		0
Total	0	1	0	21	21
Residential Mortgages | Not rated
Term Loans Amortized Cost by Origination Year
2025	22,492		22,492		21,574
2024	24,123		24,123		20,257
2023	19,138		19,138		55,321
2022	51,885		51,885		55,152
2021	51,043		51,043		64,471
Prior	106,594		106,594		56,708
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	275,275		275,275		273,483
Residential Mortgages | Special mention
Term Loans Amortized Cost by Origination Year
2025	0		0
2024	0		0
2023	0		0
2022	0		0
2021	426		426
Prior	0		0
Revolving Loans Amortized Cost	0		0
Revolving Loans Converted to Term	0		0
Total loans, net of deferred loan fees and costs	426		426
Residential Mortgages | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		0
2023	0		0		85
2022	220		220		771
2021	311		311		220
Prior	1,497		1,497		420
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	2,028		2,028		1,496
Consumer Loans
Term Loans Amortized Cost by Origination Year
Total loans, net of deferred loan fees and costs	253,366		253,366		279,915
Total gross charge-offs
Total	288	$ 286	1,030	$ 1,083
Consumer Loans | Home equity lines and loans
Term Loans Amortized Cost by Origination Year
2025	5,721		5,721		13,833
2024	12,474		12,474		10,681
2023	9,170		9,170		14,272
2022	11,893		11,893		4,879
2021	4,315		4,315		2,503
Prior	10,975		10,975		10,454
Revolving Loans Amortized Cost	46,672		46,672		35,131
Revolving Loans Converted to Term	1,852		1,852		1,467
Total loans, net of deferred loan fees and costs	103,072		103,072		93,220
Total gross charge-offs
2025			0		0
2024			0		0
2023			0		1
2022			0		0
2021			0		0
Prior			0		11
Revolving Loans Amortized Cost			0		1
Revolving Loans Converted to Term			0		0
Total			0		13
Consumer Loans | Home equity lines and loans | Not rated
Term Loans Amortized Cost by Origination Year
2025	5,721		5,721		13,833
2024	12,474		12,474		10,657
2023	9,147		9,147		14,094
2022	11,567		11,567		4,879
2021	4,315		4,315		2,503
Prior	10,784		10,784		10,259
Revolving Loans Amortized Cost	46,556		46,556		35,015
Revolving Loans Converted to Term	1,386		1,386		1,252
Total loans, net of deferred loan fees and costs	101,950		101,950		92,492
Consumer Loans | Home equity lines and loans | Special mention
Term Loans Amortized Cost by Origination Year
2025	0		0
2024	0		0
2023	0		0
2022	113		113
2021	0		0
Prior	0		0
Revolving Loans Amortized Cost	0		0
Revolving Loans Converted to Term	0		0
Total loans, net of deferred loan fees and costs	113		113
Consumer Loans | Home equity lines and loans | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		0
2024	0		0		24
2023	23		23		63
2022	213		213		0
2021	0		0		0
Prior	191		191		195
Revolving Loans Amortized Cost	116		116		116
Revolving Loans Converted to Term	466		466		215
Total loans, net of deferred loan fees and costs	1,009		1,009		613
Consumer Loans | Indirect consumer
Term Loans Amortized Cost by Origination Year
2025	18,712		18,712		37,821
2024	29,475		29,475		52,637
2023	38,335		38,335		67,344
2022	46,018		46,018		13,345
2021	7,665		7,665		4,205
Prior	2,949		2,949		2,766
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	143,154		143,154		178,118
Total gross charge-offs
2025			1		47
2024			157		517
2023			424		525
2022			231		161
2021			107		99
Prior			43		116
Revolving Loans Amortized Cost			0		0
Revolving Loans Converted to Term			0		0
Total			963		1,465
Consumer Loans | Indirect consumer | Not rated
Term Loans Amortized Cost by Origination Year
2025	18,712		18,712		37,746
2024	29,171		29,171		52,480
2023	38,024		38,024		67,237
2022	45,731		45,731		13,266
2021	7,628		7,628		4,194
Prior	2,925		2,925		2,726
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	142,191		142,191		177,649
Consumer Loans | Indirect consumer | Substandard
Term Loans Amortized Cost by Origination Year
2025	0		0		75
2024	304		304		157
2023	311		311		107
2022	287		287		79
2021	37		37		11
Prior	24		24		40
Revolving Loans Amortized Cost	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans, net of deferred loan fees and costs	963		963		469
Consumer Loans | Direct consumer
Term Loans Amortized Cost by Origination Year
2025	1,340		1,340		2,420
2024	1,565		1,565		1,681
2023	896		896		1,454
2022	694		694		275
2021	87		87		41
Prior	180		180		225
Revolving Loans Amortized Cost	2,363		2,363		2,465
Revolving Loans Converted to Term	15		15		16
Total loans, net of deferred loan fees and costs	7,140		7,140		8,577
Total gross charge-offs
2025			0		5
2024			20		21
2023			23		20
2022			9		14
2021			3		0
Prior			0		4
Revolving Loans Amortized Cost			12		8
Revolving Loans Converted to Term			0		0
Total			67		72
Consumer Loans | Direct consumer | Not rated
Term Loans Amortized Cost by Origination Year
2025	1,337		1,337		2,420
2024	1,565		1,565		1,681
2023	896		896		1,454
2022	694		694		275
2021	87		87		41
Prior	180		180		225
Revolving Loans Amortized Cost	2,353		2,353		2,455
Revolving Loans Converted to Term	14		14		14
Total loans, net of deferred loan fees and costs	7,126		7,126		8,565
Consumer Loans | Direct consumer | Substandard
Term Loans Amortized Cost by Origination Year
2025	3		3		0
2024	0		0		0
2023	0		0		0
2022	0		0		0
2021	0		0		0
Prior	0		0		0
Revolving Loans Amortized Cost	10		10		10
Revolving Loans Converted to Term	1		1		2
Total loans, net of deferred loan fees and costs	$ 14		$ 14		$ 12