ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Credit Quality Indicators (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 12,766,518	$ 11,909,436	$ 7,882,055
Total charge offs	66,007	27,470	28,315
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	1,057,398	1,184,837
Year two, originated, fiscal year before current fiscal year	748,564	545,612
Year three, originated, two years before current fiscal year	292,526	401,753
Year four, originated, three years before current fiscal year	262,535	258,295
Year five, originated, four years before current fiscal year	128,714	191,193
Prior	414,250	284,366
Revolving loans amortized cost basis	8,785	8,099
Revolving loans converted to term	250,920	260,171
Total Loans	3,163,692	3,134,326	2,270,319
Year one, current fiscal year charge offs	1,528
Year two, current fiscal year charge offs	7,818
Year three, current fiscal year charge offs	9,661
Year four, current fiscal year charge offs	3,201
Year five, current fiscal year charge offs	8,302
Prior to year 5, charge offs	11,784
Revolving loans amortized cost basis charge offs	0
Revolving loans converted to term gross charge offs	0
Total charge offs	42,294	19,004	23,592
Commercial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	977,196	1,123,803
Year two, originated, fiscal year before current fiscal year	682,680	501,761
Year three, originated, two years before current fiscal year	283,771	387,225
Year four, originated, three years before current fiscal year	251,848	211,310
Year five, originated, four years before current fiscal year	105,933	153,713
Prior	395,601	276,588
Revolving loans amortized cost basis	8,785	8,099
Revolving loans converted to term	237,786	250,486
Total Loans	2,943,600	2,912,985
Commercial | Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	7,209	28,672
Year two, originated, fiscal year before current fiscal year	11,860	27,689
Year three, originated, two years before current fiscal year	2,804	7,585
Year four, originated, three years before current fiscal year	463	9,451
Year five, originated, four years before current fiscal year	735	347
Prior	743	1,010
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	1,649	2,596
Total Loans	25,463	77,350
Commercial | Commercial and industrial | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	72,993	32,362
Year two, originated, fiscal year before current fiscal year	54,024	16,162
Year three, originated, two years before current fiscal year	5,951	6,943
Year four, originated, three years before current fiscal year	10,224	37,534
Year five, originated, four years before current fiscal year	22,046	37,133
Prior	17,906	6,768
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	11,485	7,089
Total Loans	194,629	143,991
Commercial | Owner-occupied commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	350,789	301,255
Year two, originated, fiscal year before current fiscal year	286,875	326,888
Year three, originated, two years before current fiscal year	267,790	281,461
Year four, originated, three years before current fiscal year	220,257	231,118
Year five, originated, four years before current fiscal year	213,174	118,254
Prior	354,690	400,897
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	192,512	149,709
Total Loans	1,886,087	1,809,582	1,341,707
Year one, current fiscal year charge offs	0
Year two, current fiscal year charge offs	0
Year three, current fiscal year charge offs	0
Year four, current fiscal year charge offs	0
Year five, current fiscal year charge offs	184
Prior to year 5, charge offs	0
Revolving loans amortized cost basis charge offs	0
Revolving loans converted to term gross charge offs	0
Total charge offs	184	179	83
Commercial | Owner-occupied commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	346,908	280,898
Year two, originated, fiscal year before current fiscal year	264,895	325,388
Year three, originated, two years before current fiscal year	251,262	258,177
Year four, originated, three years before current fiscal year	212,365	226,717
Year five, originated, four years before current fiscal year	194,153	106,390
Prior	313,801	363,420
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	178,150	132,942
Total Loans	1,761,534	1,693,932
Commercial | Owner-occupied commercial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	2,885	17,376
Year two, originated, fiscal year before current fiscal year	3,115	0
Year three, originated, two years before current fiscal year	5,419	0
Year four, originated, three years before current fiscal year	1,105	0
Year five, originated, four years before current fiscal year	11,002	0
Prior	5,559	2,166
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	1,393	3,351
Total Loans	30,478	22,893
Commercial | Owner-occupied commercial | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	996	2,981
Year two, originated, fiscal year before current fiscal year	18,865	1,500
Year three, originated, two years before current fiscal year	11,109	23,284
Year four, originated, three years before current fiscal year	6,787	4,401
Year five, originated, four years before current fiscal year	8,019	11,864
Prior	35,330	35,311
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	12,969	13,416
Total Loans	94,075	92,757
Commercial | Commercial mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	877,631	520,094
Year two, originated, fiscal year before current fiscal year	466,048	601,511
Year three, originated, two years before current fiscal year	527,394	542,712
Year four, originated, three years before current fiscal year	481,028	558,818
Year five, originated, four years before current fiscal year	511,873	289,583
Prior	631,660	627,247
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	305,546	211,119
Total Loans	3,801,180	3,351,084	1,881,510
Year one, current fiscal year charge offs	0
Year two, current fiscal year charge offs	83
Year three, current fiscal year charge offs	0
Year four, current fiscal year charge offs	217
Year five, current fiscal year charge offs	0
Prior to year 5, charge offs	0
Revolving loans amortized cost basis charge offs	0
Revolving loans converted to term gross charge offs	0
Total charge offs	300	581	73
Commercial | Commercial mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	847,137	516,783
Year two, originated, fiscal year before current fiscal year	464,895	600,226
Year three, originated, two years before current fiscal year	526,280	526,312
Year four, originated, three years before current fiscal year	465,354	549,788
Year five, originated, four years before current fiscal year	486,855	276,414
Prior	619,448	594,024
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	290,083	210,550
Total Loans	3,700,052	3,274,097
Commercial | Commercial mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	20,632	1,450
Year two, originated, fiscal year before current fiscal year	0	75
Year three, originated, two years before current fiscal year	67	3,848
Year four, originated, three years before current fiscal year	1,837	6,121
Year five, originated, four years before current fiscal year	10,666	9,596
Prior	0	32,014
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total Loans	33,202	53,104
Commercial | Commercial mortgages | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	9,862	1,861
Year two, originated, fiscal year before current fiscal year	1,153	1,210
Year three, originated, two years before current fiscal year	1,047	12,552
Year four, originated, three years before current fiscal year	13,837	2,909
Year five, originated, four years before current fiscal year	14,352	3,573
Prior	12,212	1,209
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	15,463	569
Total Loans	67,926	23,883
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	463,471	448,581
Year two, originated, fiscal year before current fiscal year	339,727	303,819
Year three, originated, two years before current fiscal year	122,868	124,597
Year four, originated, three years before current fiscal year	11,628	9,502
Year five, originated, four years before current fiscal year	2,522	26,553
Prior	7,016	7,539
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	88,298	123,458
Total Loans	1,035,530	1,044,049	687,213
Year one, current fiscal year charge offs	0
Year two, current fiscal year charge offs	0
Year three, current fiscal year charge offs	794
Year four, current fiscal year charge offs	0
Year five, current fiscal year charge offs	0
Prior to year 5, charge offs	0
Revolving loans amortized cost basis charge offs	0
Revolving loans converted to term gross charge offs	0
Total charge offs	794	0	2,473
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	429,055	448,581
Year two, originated, fiscal year before current fiscal year	319,958	299,619
Year three, originated, two years before current fiscal year	111,333	115,667
Year four, originated, three years before current fiscal year	3,030	9,319
Year five, originated, four years before current fiscal year	388	26,553
Prior	7,016	7,539
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	87,741	122,116
Total Loans	958,521	1,029,394
Commercial | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	28,718	0
Year two, originated, fiscal year before current fiscal year	19,769	0
Year three, originated, two years before current fiscal year	8,227	0
Year four, originated, three years before current fiscal year	0	0
Year five, originated, four years before current fiscal year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	581
Total Loans	56,714	581
Commercial | Construction | Substandard or Lower
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	5,698	0
Year two, originated, fiscal year before current fiscal year	0	4,200
Year three, originated, two years before current fiscal year	3,308	8,930
Year four, originated, three years before current fiscal year	8,598	183
Year five, originated, four years before current fiscal year	2,134	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	557	761
Total Loans	20,295	14,074
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	188,644	64,500
Year two, originated, fiscal year before current fiscal year	67,528	111,237
Year three, originated, two years before current fiscal year	103,695	61,127
Year four, originated, three years before current fiscal year	57,759	37,117
Year five, originated, four years before current fiscal year	34,750	47,077
Prior	415,519	438,407
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total Loans	867,895	759,465	542,733
Year one, current fiscal year charge offs	33
Year two, current fiscal year charge offs	0
Year three, current fiscal year charge offs	0
Year four, current fiscal year charge offs	0
Year five, current fiscal year charge offs	0
Prior to year 5, charge offs	8
Revolving loans amortized cost basis charge offs	0
Revolving loans converted to term gross charge offs	0
Total charge offs	41	186	0
Residential | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	188,644	64,500
Year two, originated, fiscal year before current fiscal year	67,358	110,508
Year three, originated, two years before current fiscal year	102,982	60,625
Year four, originated, three years before current fiscal year	57,273	36,118
Year five, originated, four years before current fiscal year	33,499	45,859
Prior	412,099	434,175
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total Loans	861,855	751,785
Residential | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	170	729
Year three, originated, two years before current fiscal year	713	502
Year four, originated, three years before current fiscal year	486	999
Year five, originated, four years before current fiscal year	1,251	1,218
Prior	3,420	4,232
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Total Loans	6,040	7,680
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	391,580	595,158
Year two, originated, fiscal year before current fiscal year	568,919	195,397
Year three, originated, two years before current fiscal year	154,065	126,806
Year four, originated, three years before current fiscal year	104,600	54,449
Year five, originated, four years before current fiscal year	45,172	220,518
Prior	245,879	71,478
Revolving loans amortized cost basis	496,025	541,563
Revolving loans converted to term	5,894	5,561
Total Loans	2,012,134	1,810,930	1,158,573
Year one, current fiscal year charge offs	1,790
Year two, current fiscal year charge offs	15,227
Year three, current fiscal year charge offs	4,411
Year four, current fiscal year charge offs	313
Year five, current fiscal year charge offs	198
Prior to year 5, charge offs	455
Revolving loans amortized cost basis charge offs	0
Revolving loans converted to term gross charge offs	0
Total charge offs	22,394	7,520	$ 2,094
Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	391,580	595,158
Year two, originated, fiscal year before current fiscal year	568,919	195,397
Year three, originated, two years before current fiscal year	153,930	126,456
Year four, originated, three years before current fiscal year	104,248	54,449
Year five, originated, four years before current fiscal year	44,996	220,039
Prior	245,849	71,478
Revolving loans amortized cost basis	494,663	540,308
Revolving loans converted to term	5,662	5,232
Total Loans	2,009,847	1,808,517
Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, originated, current fiscal year	0	0
Year two, originated, fiscal year before current fiscal year	0	0
Year three, originated, two years before current fiscal year	135	350
Year four, originated, three years before current fiscal year	352	0
Year five, originated, four years before current fiscal year	176	479
Prior	30	0
Revolving loans amortized cost basis	1,362	1,255
Revolving loans converted to term	232	329
Total Loans	$ 2,287	$ 2,413