ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Schedule of Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 13,141,390	$ 12,336,834	$ 13,141,390	$ 12,336,834	$ 12,766,518
Total charge offs	17,572	15,874	29,431	29,540
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	397,570		397,570		797,050
Year two, originated, fiscal year before current fiscal year	765,028		765,028		556,818
Year three, originated, two years before current fiscal year	469,054		469,054		189,098
Year four, originated, three years before current fiscal year	159,887		159,887		221,838
Year five, originated, four years before current fiscal year	183,822		183,822		113,303
Prior	378,508		378,508		402,258
Revolving loans amortized cost basis	9,528		9,528		8,785
Revolving loans converted to term	275,755		275,755		250,920
Total Loans	2,639,152	2,623,723	2,639,152	2,623,723	2,540,070
Year one, current fiscal year charge offs			0		0
Year two, current fiscal year charge offs			74		568
Year three, current fiscal year charge offs			134		5,214
Year four, current fiscal year charge offs			151		1,747
Year five, current fiscal year charge offs			206		7,567
Prior year charge offs			1,817		11,557
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	1,906	6,453	2,382	13,016	26,653
Commercial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	342,046		342,046		716,848
Year two, originated, fiscal year before current fiscal year	716,383		716,383		490,934
Year three, originated, two years before current fiscal year	411,996		411,996		180,343
Year four, originated, three years before current fiscal year	153,043		153,043		211,151
Year five, originated, four years before current fiscal year	178,489		178,489		90,522
Prior	334,222		334,222		383,609
Revolving loans amortized cost basis	9,499		9,499		8,785
Revolving loans converted to term	247,094		247,094		237,786
Total Loans	2,392,772		2,392,772		2,319,978
Commercial | Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	3,088		3,088		7,209
Year two, originated, fiscal year before current fiscal year	1,519		1,519		11,860
Year three, originated, two years before current fiscal year	2,857		2,857		2,804
Year four, originated, three years before current fiscal year	0		0		463
Year five, originated, four years before current fiscal year	0		0		735
Prior	1,524		1,524		743
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	14,892		14,892		1,649
Total Loans	23,880		23,880		25,463
Commercial | Commercial and industrial | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	52,436		52,436		72,993
Year two, originated, fiscal year before current fiscal year	47,126		47,126		54,024
Year three, originated, two years before current fiscal year	54,201		54,201		5,951
Year four, originated, three years before current fiscal year	6,844		6,844		10,224
Year five, originated, four years before current fiscal year	5,333		5,333		22,046
Prior	42,762		42,762		17,906
Revolving loans amortized cost basis	29		29		0
Revolving loans converted to term	13,769		13,769		11,485
Total Loans	222,500		222,500		194,629
Commercial | Owner-occupied commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	148,836		148,836		350,789
Year two, originated, fiscal year before current fiscal year	328,328		328,328		286,875
Year three, originated, two years before current fiscal year	258,877		258,877		267,790
Year four, originated, three years before current fiscal year	250,828		250,828		220,257
Year five, originated, four years before current fiscal year	208,627		208,627		213,174
Prior	520,742		520,742		354,690
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	224,439		224,439		192,512
Total Loans	1,940,677	1,883,055	1,940,677	1,883,055	1,886,087
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		0
Year four, current fiscal year charge offs			0		0
Year five, current fiscal year charge offs			0		184
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	184	0	184	184
Commercial | Owner-occupied commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	148,343		148,343		346,908
Year two, originated, fiscal year before current fiscal year	327,387		327,387		264,895
Year three, originated, two years before current fiscal year	217,530		217,530		251,262
Year four, originated, three years before current fiscal year	238,638		238,638		212,365
Year five, originated, four years before current fiscal year	177,313		177,313		194,153
Prior	454,474		454,474		313,801
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	210,962		210,962		178,150
Total Loans	1,774,647		1,774,647		1,761,534
Commercial | Owner-occupied commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		0		2,885
Year two, originated, fiscal year before current fiscal year	248		248		3,115
Year three, originated, two years before current fiscal year	20,831		20,831		5,419
Year four, originated, three years before current fiscal year	1,379		1,379		1,105
Year five, originated, four years before current fiscal year	25,932		25,932		11,002
Prior	21,554		21,554		5,559
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	1,554		1,554		1,393
Total Loans	71,498		71,498		30,478
Commercial | Owner-occupied commercial | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	493		493		996
Year two, originated, fiscal year before current fiscal year	693		693		18,865
Year three, originated, two years before current fiscal year	20,516		20,516		11,109
Year four, originated, three years before current fiscal year	10,811		10,811		6,787
Year five, originated, four years before current fiscal year	5,382		5,382		8,019
Prior	44,714		44,714		35,330
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	11,923		11,923		12,969
Total Loans	94,532		94,532		94,075
Commercial | Commercial mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	294,557		294,557		877,631
Year two, originated, fiscal year before current fiscal year	820,548		820,548		466,048
Year three, originated, two years before current fiscal year	570,001		570,001		527,394
Year four, originated, three years before current fiscal year	452,619		452,619		481,028
Year five, originated, four years before current fiscal year	442,849		442,849		511,873
Prior	1,004,136		1,004,136		631,660
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	450,108		450,108		305,546
Total Loans	4,034,818	3,552,800	4,034,818	3,552,800	3,801,180
Year one, current fiscal year charge offs			0		0
Year two, current fiscal year charge offs			25		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			0		0
Prior year charge offs			4,907		0
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	4,907	0	4,932	0	300
Commercial | Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	276,251		276,251		847,137
Year two, originated, fiscal year before current fiscal year	779,662		779,662		464,895
Year three, originated, two years before current fiscal year	568,431		568,431		526,280
Year four, originated, three years before current fiscal year	446,777		446,777		465,354
Year five, originated, four years before current fiscal year	415,596		415,596		486,855
Prior	969,561		969,561		619,448
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	434,855		434,855		290,083
Total Loans	3,891,133		3,891,133		3,700,052
Commercial | Commercial mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0		0		20,632
Year two, originated, fiscal year before current fiscal year	33,637		33,637		0
Year three, originated, two years before current fiscal year	571		571		67
Year four, originated, three years before current fiscal year	4,886		4,886		1,837
Year five, originated, four years before current fiscal year	1,797		1,797		10,666
Prior	2,159		2,159		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	14,515		14,515		0
Total Loans	57,565		57,565		33,202
Commercial | Commercial mortgages | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	18,306		18,306		9,862
Year two, originated, fiscal year before current fiscal year	7,249		7,249		1,153
Year three, originated, two years before current fiscal year	999		999		1,047
Year four, originated, three years before current fiscal year	956		956		13,837
Year five, originated, four years before current fiscal year	25,456		25,456		14,352
Prior	32,416		32,416		12,212
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	738		738		15,463
Total Loans	86,120		86,120		67,926
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	208,462		208,462		463,471
Year two, originated, fiscal year before current fiscal year	345,989		345,989		339,727
Year three, originated, two years before current fiscal year	197,218		197,218		122,868
Year four, originated, three years before current fiscal year	29,066		29,066		11,628
Year five, originated, four years before current fiscal year	89		89		2,522
Prior	4,583		4,583		7,016
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	93,810		93,810		88,298
Total Loans	879,217	955,224	879,217	955,224	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	191,277		191,277		429,055
Year two, originated, fiscal year before current fiscal year	322,283		322,283		319,958
Year three, originated, two years before current fiscal year	193,905		193,905		111,333
Year four, originated, three years before current fiscal year	25,024		25,024		3,030
Year five, originated, four years before current fiscal year	89		89		388
Prior	4,438		4,438		7,016
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	93,264		93,264		87,741
Total Loans	830,280		830,280		958,521
Commercial | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	8,057		8,057		28,718
Year two, originated, fiscal year before current fiscal year	0		0		19,769
Year three, originated, two years before current fiscal year	3,313		3,313		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	11,370		11,370		56,714
Commercial | Construction | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	9,128		9,128		5,698
Year two, originated, fiscal year before current fiscal year	23,706		23,706		0
Year three, originated, two years before current fiscal year	0		0		3,308
Year four, originated, three years before current fiscal year	4,042		4,042		8,598
Year five, originated, four years before current fiscal year	0		0		2,134
Prior	145		145		0
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	546		546		557
Total Loans	37,567		37,567		20,295
Commercial | Commercial Small Business Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	137,975		137,975		260,348
Year two, originated, fiscal year before current fiscal year	225,819		225,819		191,746
Year three, originated, two years before current fiscal year	156,005		156,005		103,428
Year four, originated, three years before current fiscal year	78,843		78,843		40,697
Year five, originated, four years before current fiscal year	26,664		26,664		15,411
Prior	18,214		18,214		11,992
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	643,520	590,063	643,520	590,063	623,622
Year one, current fiscal year charge offs			11		1,528
Year two, current fiscal year charge offs			2,548		7,250
Year three, current fiscal year charge offs			3,955		4,447
Year four, current fiscal year charge offs			2,042		1,454
Year five, current fiscal year charge offs			846		735
Prior year charge offs			338		227
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	4,888	3,906	9,740	6,805	15,641
Commercial | Commercial Small Business Leases | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	137,975		137,975		260,348
Year two, originated, fiscal year before current fiscal year	225,819		225,819		191,746
Year three, originated, two years before current fiscal year	156,005		156,005		103,428
Year four, originated, three years before current fiscal year	78,843		78,843		40,697
Year five, originated, four years before current fiscal year	26,664		26,664		15,411
Prior	18,214		18,214		11,992
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	643,520		643,520		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	67,721		67,721		188,644
Year two, originated, fiscal year before current fiscal year	185,317		185,317		67,528
Year three, originated, two years before current fiscal year	65,372		65,372		103,695
Year four, originated, three years before current fiscal year	99,011		99,011		57,759
Year five, originated, four years before current fiscal year	56,810		56,810		34,750
Prior	423,342		423,342		415,519
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	897,573	826,750	897,573	826,750	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			101		8
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	51	33	101	33	41
Residential | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	67,721		67,721		188,644
Year two, originated, fiscal year before current fiscal year	185,317		185,317		67,358
Year three, originated, two years before current fiscal year	65,007		65,007		102,982
Year four, originated, three years before current fiscal year	95,534		95,534		57,273
Year five, originated, four years before current fiscal year	56,120		56,120		33,499
Prior	419,412		419,412		412,099
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	889,111		889,111		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	0		0		170
Year three, originated, two years before current fiscal year	365		365		713
Year four, originated, three years before current fiscal year	3,477		3,477		486
Year five, originated, four years before current fiscal year	690		690		1,251
Prior	3,930		3,930		3,420
Revolving loans amortized cost basis	0		0		0
Revolving loans converted to term	0		0		0
Total Loans	8,462		8,462		6,040
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	149,512		149,512		391,580
Year two, originated, fiscal year before current fiscal year	402,785		402,785		568,919
Year three, originated, two years before current fiscal year	507,860		507,860		154,065
Year four, originated, three years before current fiscal year	135,148		135,148		104,600
Year five, originated, four years before current fiscal year	94,776		94,776		45,172
Prior	292,561		292,561		245,879
Revolving loans amortized cost basis	516,825		516,825		496,025
Revolving loans converted to term	6,966		6,966		5,894
Total Loans	2,106,433	1,905,219	2,106,433	1,905,219	2,012,134
Year one, current fiscal year charge offs			521		1,790
Year two, current fiscal year charge offs			1,662		15,227
Year three, current fiscal year charge offs			7,697		4,411
Year four, current fiscal year charge offs			1,573		313
Year five, current fiscal year charge offs			477		198
Prior year charge offs			346		455
Revolving loans amortized cost basis charge offs			0		0
Revolving loans converted to term gross charge offs			0		0
Total charge offs	5,820	$ 5,298	12,276	$ 9,502	22,394
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	149,512		149,512		391,580
Year two, originated, fiscal year before current fiscal year	402,536		402,536		568,919
Year three, originated, two years before current fiscal year	507,860		507,860		153,930
Year four, originated, three years before current fiscal year	134,878		134,878		104,248
Year five, originated, four years before current fiscal year	94,424		94,424		44,996
Prior	292,334		292,334		245,849
Revolving loans amortized cost basis	515,249		515,249		494,663
Revolving loans converted to term	6,802		6,802		5,662
Total Loans	2,103,595		2,103,595		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	0		0		135
Year four, originated, three years before current fiscal year	270		270		352
Year five, originated, four years before current fiscal year	352		352		176
Prior	227		227		30
Revolving loans amortized cost basis	1,576		1,576		1,362
Revolving loans converted to term	164		164		232
Total Loans	$ 2,838		$ 2,838		$ 2,287