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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 13,318,988	$ 12,675,621	$ 13,318,988	$ 12,675,621	$ 12,766,518
Total charge offs	23,101	16,847	52,532	46,387
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	561,627		561,627		797,050
Year two, originated, fiscal year before current fiscal year	708,562		708,562		556,818
Year three, originated, two years before current fiscal year	418,295		418,295		189,098
Year four, originated, three years before current fiscal year	144,193		144,193		221,838
Year five, originated, four years before current fiscal year	169,757		169,757		113,303
Prior	338,612		338,612		402,258
Revolving loans amortized cost basis	9,845		9,845		8,785
Revolving loans converted to term	288,375		288,375		250,920
Total Loans	2,639,266	2,644,039	2,639,266	2,644,039	2,540,070
Year one, current fiscal year charge offs			0		0
Year two, current fiscal year charge offs			1,081		568
Year three, current fiscal year charge offs			3,782		5,214
Year four, current fiscal year charge offs			585		1,747
Year five, current fiscal year charge offs			275		7,567
Prior year charge offs			7,936		11,557
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	11,277	7,153	13,659	20,169	26,653
Commercial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	472,797		472,797		716,848
Year two, originated, fiscal year before current fiscal year	662,751		662,751		490,934
Year three, originated, two years before current fiscal year	383,695		383,695		180,343
Year four, originated, three years before current fiscal year	135,462		135,462		211,151
Year five, originated, four years before current fiscal year	162,191		162,191		90,522
Prior	298,797		298,797		383,609
Revolving loans amortized cost basis	9,775		9,775		8,785
Revolving loans converted to term	242,784		242,784		237,786
Total Loans	2,368,252		2,368,252		2,319,978
Commercial | Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	17,659		17,659		7,209
Year two, originated, fiscal year before current fiscal year	3,913		3,913		11,860
Year three, originated, two years before current fiscal year	4,979		4,979		2,804
Year four, originated, three years before current fiscal year	2,744		2,744		463
Year five, originated, four years before current fiscal year	2,670		2,670		735
Prior	1,195		1,195		743
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	15,899		15,899		1,649
Total Loans	49,059		49,059		25,463
Commercial | Commercial and industrial | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	71,171		71,171		72,993
Year two, originated, fiscal year before current fiscal year	41,898		41,898		54,024
Year three, originated, two years before current fiscal year	29,621		29,621		5,951
Year four, originated, three years before current fiscal year	5,987		5,987		10,224
Year five, originated, four years before current fiscal year	4,896		4,896		22,046
Prior	38,620		38,620		17,906
Revolving loans amortized cost basis	70		70		0
Revolving loans converted to term	29,692		29,692		11,485
Total Loans	221,955		221,955		194,629
Commercial | Owner-occupied commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	233,144		233,144		350,789
Year two, originated, fiscal year before current fiscal year	321,106		321,106		286,875
Year three, originated, two years before current fiscal year	255,047		255,047		267,790
Year four, originated, three years before current fiscal year	242,332		242,332		220,257
Year five, originated, four years before current fiscal year	202,894		202,894		213,174
Prior	482,316		482,316		354,690
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	266,883		266,883		192,512
Total Loans	2,003,722	1,924,171	2,003,722	1,924,171	1,886,087
Year one, current fiscal year charge offs			0		0
Year two, current fiscal year charge offs			114		0
Year three, current fiscal year charge offs			0		0
Year four, current fiscal year charge offs			0		0
Year five, current fiscal year charge offs			0		184
Prior year charge offs			63		0
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	177	0	177	184	184
Commercial | Owner-occupied commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	222,614		222,614		346,908
Year two, originated, fiscal year before current fiscal year	313,975		313,975		264,895
Year three, originated, two years before current fiscal year	211,697		211,697		251,262
Year four, originated, three years before current fiscal year	230,312		230,312		212,365
Year five, originated, four years before current fiscal year	171,898		171,898		194,153
Prior	430,446		430,446		313,801
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	252,832		252,832		178,150
Total Loans	1,833,774		1,833,774		1,761,534
Commercial | Owner-occupied commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	10,530		10,530		2,885
Year two, originated, fiscal year before current fiscal year	1,948		1,948		3,115
Year three, originated, two years before current fiscal year	20,157		20,157		5,419
Year four, originated, three years before current fiscal year	1,300		1,300		1,105
Year five, originated, four years before current fiscal year	25,677		25,677		11,002
Prior	5,324		5,324		5,559
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	2,310		2,310		1,393
Total Loans	67,246		67,246		30,478
Commercial | Owner-occupied commercial | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		0		996
Year two, originated, fiscal year before current fiscal year	5,183		5,183		18,865
Year three, originated, two years before current fiscal year	23,193		23,193		11,109
Year four, originated, three years before current fiscal year	10,720		10,720		6,787
Year five, originated, four years before current fiscal year	5,319		5,319		8,019
Prior	46,546		46,546		35,330
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	11,741		11,741		12,969
Total Loans	102,702		102,702		94,075
Commercial | Commercial mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	484,236		484,236		877,631
Year two, originated, fiscal year before current fiscal year	794,809		794,809		466,048
Year three, originated, two years before current fiscal year	541,540		541,540		527,394
Year four, originated, three years before current fiscal year	443,814		443,814		481,028
Year five, originated, four years before current fiscal year	434,828		434,828		511,873
Prior	946,752		946,752		631,660
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	503,070		503,070		305,546
Total Loans	4,149,049	3,645,723	4,149,049	3,645,723	3,801,180
Year one, current fiscal year charge offs			0		0
Year two, current fiscal year charge offs			62		83
Year three, current fiscal year charge offs			0		0
Year four, current fiscal year charge offs			0		217
Year five, current fiscal year charge offs			97		0
Prior year charge offs			4,978		0
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	205	300	5,137	300	300
Commercial | Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	448,085		448,085		847,137
Year two, originated, fiscal year before current fiscal year	747,896		747,896		464,895
Year three, originated, two years before current fiscal year	524,510		524,510		526,280
Year four, originated, three years before current fiscal year	437,941		437,941		465,354
Year five, originated, four years before current fiscal year	407,068		407,068		486,855
Prior	917,704		917,704		619,448
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	465,513		465,513		290,083
Total Loans	3,948,717		3,948,717		3,700,052
Commercial | Commercial mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	3,946		3,946		20,632
Year two, originated, fiscal year before current fiscal year	18,781		18,781		0
Year three, originated, two years before current fiscal year	16,100		16,100		67
Year four, originated, three years before current fiscal year	5,743		5,743		1,837
Year five, originated, four years before current fiscal year	2,655		2,655		10,666
Prior	2,309		2,309		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	36,825		36,825		0
Total Loans	86,359		86,359		33,202
Commercial | Commercial mortgages | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	32,205		32,205		9,862
Year two, originated, fiscal year before current fiscal year	28,132		28,132		1,153
Year three, originated, two years before current fiscal year	930		930		1,047
Year four, originated, three years before current fiscal year	130		130		13,837
Year five, originated, four years before current fiscal year	25,105		25,105		14,352
Prior	26,739		26,739		12,212
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	732		732		15,463
Total Loans	113,973		113,973		67,926
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	251,187		251,187		463,471
Year two, originated, fiscal year before current fiscal year	314,082		314,082		339,727
Year three, originated, two years before current fiscal year	197,320		197,320		122,868
Year four, originated, three years before current fiscal year	11,237		11,237		11,628
Year five, originated, four years before current fiscal year	88		88		2,522
Prior	2,383		2,383		7,016
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	29,560		29,560		88,298
Total Loans	805,857	1,043,568	805,857	1,043,568	1,035,530
Year one, current fiscal year charge offs			0		0
Year two, current fiscal year charge offs			0		0
Year three, current fiscal year charge offs			0		794
Year four, current fiscal year charge offs			0		0
Year five, current fiscal year charge offs			0		0
Prior year charge offs			0		0
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	0	0	0	0	794
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	247,244		247,244		429,055
Year two, originated, fiscal year before current fiscal year	289,273		289,273		319,958
Year three, originated, two years before current fiscal year	173,141		173,141		111,333
Year four, originated, three years before current fiscal year	7,798		7,798		3,030
Year five, originated, four years before current fiscal year	88		88		388
Prior	2,241		2,241		7,016
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	29,014		29,014		87,741
Total Loans	748,799		748,799		958,521
Commercial | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	2,200		2,200		28,718
Year two, originated, fiscal year before current fiscal year	0		0		19,769
Year three, originated, two years before current fiscal year	3,400		3,400		8,227
Year four, originated, three years before current fiscal year	0		0		0
Year five, originated, four years before current fiscal year	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	5,600		5,600		56,714
Commercial | Construction | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1,743		1,743		5,698
Year two, originated, fiscal year before current fiscal year	24,809		24,809		0
Year three, originated, two years before current fiscal year	20,779		20,779		3,308
Year four, originated, three years before current fiscal year	3,439		3,439		8,598
Year five, originated, four years before current fiscal year	0		0		2,134
Prior	142		142		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	546		546		557
Total Loans	51,458		51,458		20,295
Commercial | Commercial Small Business Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	193,681		193,681		260,348
Year two, originated, fiscal year before current fiscal year	207,734		207,734		191,746
Year three, originated, two years before current fiscal year	138,351		138,351		103,428
Year four, originated, three years before current fiscal year	67,168		67,168		40,697
Year five, originated, four years before current fiscal year	20,199		20,199		15,411
Prior	18,288		18,288		11,992
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	645,421	605,698	645,421	605,698	623,622
Year one, current fiscal year charge offs			409		1,528
Year two, current fiscal year charge offs			3,903		7,250
Year three, current fiscal year charge offs			6,391		4,447
Year four, current fiscal year charge offs			2,965		1,454
Year five, current fiscal year charge offs			1,069		735
Prior year charge offs			454		227
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	5,451	3,522	15,191	10,327	15,641
Commercial | Commercial Small Business Leases | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	193,681		193,681		260,348
Year two, originated, fiscal year before current fiscal year	207,734		207,734		191,746
Year three, originated, two years before current fiscal year	138,351		138,351		103,428
Year four, originated, three years before current fiscal year	67,168		67,168		40,697
Year five, originated, four years before current fiscal year	20,199		20,199		15,411
Prior	18,288		18,288		11,992
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	645,421		645,421		623,622
Commercial | Commercial Small Business Leases | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		0		0
Year two, originated, fiscal year before current fiscal year	0		0		0
Year three, originated, two years before current fiscal year	0		0		0
Year four, originated, three years before current fiscal year	0		0		0
Year five, originated, four years before current fiscal year	0		0		0
Prior	0		0		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	0		0		0
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	124,092		124,092		188,644
Year two, originated, fiscal year before current fiscal year	181,256		181,256		67,528
Year three, originated, two years before current fiscal year	63,718		63,718		103,695
Year four, originated, three years before current fiscal year	97,333		97,333		57,759
Year five, originated, four years before current fiscal year	52,384		52,384		34,750
Prior	418,811		418,811		415,519
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	937,594	855,340	937,594	855,340	867,895
Year one, current fiscal year charge offs			0		33
Year two, current fiscal year charge offs			0		0
Year three, current fiscal year charge offs			0		0
Year four, current fiscal year charge offs			0		0
Year five, current fiscal year charge offs			0		0
Prior year charge offs			109		8
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	8	0	109	33	41
Residential | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	124,092		124,092		188,644
Year two, originated, fiscal year before current fiscal year	181,135		181,135		67,358
Year three, originated, two years before current fiscal year	63,356		63,356		102,982
Year four, originated, three years before current fiscal year	93,860		93,860		57,273
Year five, originated, four years before current fiscal year	51,527		51,527		33,499
Prior	415,006		415,006		412,099
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	928,976		928,976		861,855
Residential | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		0		0
Year two, originated, fiscal year before current fiscal year	121		121		170
Year three, originated, two years before current fiscal year	362		362		713
Year four, originated, three years before current fiscal year	3,473		3,473		486
Year five, originated, four years before current fiscal year	857		857		1,251
Prior	3,805		3,805		3,420
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	8,618		8,618		6,040
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	247,462		247,462		391,580
Year two, originated, fiscal year before current fiscal year	377,884		377,884		568,919
Year three, originated, two years before current fiscal year	475,174		475,174		154,065
Year four, originated, three years before current fiscal year	125,418		125,418		104,600
Year five, originated, four years before current fiscal year	90,099		90,099		45,172
Prior	273,720		273,720		245,879
Revolving loans amortized cost basis	541,905		541,905		496,025
Revolving loans converted to term	6,417		6,417		5,894
Total Loans	2,138,079	1,957,082	2,138,079	1,957,082	2,012,134
Year one, current fiscal year charge offs			891		1,790
Year two, current fiscal year charge offs			2,575		15,227
Year three, current fiscal year charge offs			11,318		4,411
Year four, current fiscal year charge offs			2,241		313
Year five, current fiscal year charge offs			785		198
Prior year charge offs			449		455
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	5,983	$ 5,872	18,259	$ 15,374	22,394
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	247,462		247,462		391,580
Year two, originated, fiscal year before current fiscal year	377,635		377,635		568,919
Year three, originated, two years before current fiscal year	475,078		475,078		153,930
Year four, originated, three years before current fiscal year	125,151		125,151		104,248
Year five, originated, four years before current fiscal year	89,903		89,903		44,996
Prior	273,693		273,693		245,849
Revolving loans amortized cost basis	540,062		540,062		494,663
Revolving loans converted to term	6,114		6,114		5,662
Total Loans	2,135,098		2,135,098		2,009,847
Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		0		0
Year two, originated, fiscal year before current fiscal year	249		249		0
Year three, originated, two years before current fiscal year	96		96		135
Year four, originated, three years before current fiscal year	267		267		352
Year five, originated, four years before current fiscal year	196		196		176
Prior	27		27		30
Revolving loans amortized cost basis	1,843		1,843		1,362
Revolving loans converted to term	303		303		232
Total Loans	$ 2,981		$ 2,981		$ 2,287

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Definition

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

+ References

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
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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

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X

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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X

- Definition

Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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