CREDIT QUALITY ASSESSMENT - Information about Credit Quality Indicator by Year of Origination (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 642,534		$ 3,120,897
Year one	2,980,425		2,647,414
Year two	2,518,171		1,339,364
Year three	1,301,578		1,039,363
Year four	941,066		649,024
Prior	1,977,227		1,559,209
Revolving Loans	1,008,638		1,041,435
Total loans	11,369,639		11,396,706
Current period gross charge-offs, Total	2,265	$ 762	1,105
Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	242,226		1,543,664
Year one	1,412,830		1,216,546
Year two	1,244,728		695,224
Year three	689,275		567,341
Year four	554,346		343,815
Prior	962,950		748,262
Revolving Loans	24,855		15,242
Total loans	5,131,210		5,130,094
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	0		0
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		0
Current period gross charge-offs, prior	0		0
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	0		0
Commercial investor real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	221,130		1,510,446
Year one	1,401,988		1,197,504
Year two	1,210,529		694,756
Year three	689,275		567,247
Year four	552,876		335,103
Prior	958,510		742,405
Revolving Loans	24,855		15,242
Total loans	5,059,163		5,062,703
Commercial investor real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	6,297		32,661
Year one	10,298		17,146
Year two	30,536		468
Year three	0		94
Year four	93		473
Prior	2,880		4,814
Revolving Loans	0		0
Total loans	50,104		55,656
Commercial investor real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	14,799		557
Year one	544		1,896
Year two	3,663		0
Year three	0		0
Year four	1,377		8,239
Prior	1,560		1,043
Revolving Loans	0		0
Total loans	21,943		11,735
Commercial investor real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	0		0
Commercial owner-occupied real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	91,481		399,126
Year one	371,068		328,817
Year two	325,962		242,172
Year three	240,139		267,964
Year four	252,485		144,917
Prior	486,816		390,874
Revolving Loans	2,184		1,167
Total loans	1,770,135		1,775,037
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	0		0
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		0
Current period gross charge-offs, prior	0		0
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	0		0
Commercial owner-occupied real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	87,454		391,340
Year one	366,576		328,657
Year two	325,147		240,738
Year three	238,899		260,114
Year four	246,174		140,841
Prior	474,408		381,386
Revolving Loans	2,184		1,167
Total loans	1,740,842		1,744,243
Commercial owner-occupied real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	731		4,567
Year one	739		0
Year two	0		1,301
Year three	889		1,740
Year four	323		2,066
Prior	7,538		7,323
Revolving Loans	0		0
Total loans	10,220		16,997
Commercial owner-occupied real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	3,296		3,219
Year one	3,753		160
Year two	815		133
Year three	351		6,110
Year four	5,988		2,010
Prior	4,870		2,165
Revolving Loans	0		0
Total loans	19,073		13,797
Commercial owner-occupied real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	0		0
Commercial AD&C
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	191,437		367,169
Year one	319,457		439,468
Year two	284,974		113,713
Year three	78,362		34,340
Year four	1,867		14,816
Prior	15,079		0
Revolving Loans	154,566		120,522
Total loans	1,045,742		1,090,028
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	0		0
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		0
Current period gross charge-offs, prior	0		0
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	0		0
Commercial AD&C | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	189,426		366,096
Year one	318,888		439,468
Year two	284,974		113,713
Year three	78,362		34,340
Year four	1,867		14,816
Prior	15,079		0
Revolving Loans	154,566		119,727
Total loans	1,043,162		1,088,160
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,661		1,073
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		795
Total loans	1,661		1,868
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	350		0
Year one	569		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	919		0
Commercial AD&C | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	0		0
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	18,948		336,909
Year one	388,761		357,307
Year two	407,664		176,834
Year three	176,689		50,886
Year four	49,469		61,970
Prior	344,212		304,027
Revolving Loans	0		0
Total loans	1,385,743		1,287,933
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	43		0
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	10		24
Current period gross charge-offs, prior	107		131
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	160		155
Residential mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	18,644		330,109
Year one	377,467		344,062
Year two	387,642		171,330
Year three	168,643		41,883
Year four	41,092		51,651
Prior	290,758		262,570
Revolving Loans	0		0
Total loans	1,284,246		1,201,605
Residential mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		4,571
Year one	8,016		6,196
Year two	13,725		1,173
Year three	4,075		3,925
Year four	3,858		6,041
Prior	29,123		24,006
Revolving Loans	0		0
Total loans	58,797		45,912
Residential mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	304		369
Year one	2,915		4,013
Year two	3,291		1,439
Year three	523		1,256
Year four	1,511		1,931
Prior	8,894		6,945
Revolving Loans	0		0
Total loans	17,438		15,953
Residential mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		1,860
Year one	363		3,036
Year two	3,006		2,892
Year three	3,448		3,822
Year four	3,008		2,347
Prior	15,437		10,506
Revolving Loans	0		0
Total loans	25,262		24,463
Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,689		132,776
Year one	136,444		77,036
Year two	37,326		12,133
Year three	5,837		150
Year four	150		1,432
Prior	1,244		1,245
Revolving Loans	0		0
Total loans	190,690		224,772
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	0		0
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		0
Current period gross charge-offs, prior	0		0
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	0		0
Residential construction | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,189		131,259
Year one	135,471		75,844
Year two	36,186		12,133
Year three	5,837		150
Year four	150		1,432
Prior	1,244		1,245
Revolving Loans	0		0
Total loans	188,077		222,063
Residential construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		908
Year one	973		373
Year two	739		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	1,712		1,281
Residential construction | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		609
Year one	0		0
Year two	401		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	401		609
Residential construction | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	500		0
Year one	0		819
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	500		819
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,370,701		9,451,044
Commercial Business | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	83,152		333,627
Year one	344,901		225,314
Year two	214,650		97,988
Year three	110,020		115,739
Year four	79,975		78,838
Prior	132,154		80,452
Revolving Loans	458,762		523,927
Total loans	1,423,614		1,455,885
Current period gross charge-offs, current year	0		174
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	324		0
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		138
Current period gross charge-offs, prior	99		404
Current period gross charge-offs, revolving			0
Current period gross charge-offs, Total	423		716
Commercial Business | Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	81,897		330,598
Year one	342,575		223,245
Year two	212,680		95,787
Year three	108,084		105,922
Year four	75,222		77,891
Prior	129,998		78,009
Revolving Loans	441,542		508,839
Total loans	1,391,998		1,420,291
Commercial Business | Commercial business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		127
Year one	95		458
Year two	204		1,107
Year three	942		7,787
Year four	2,172		498
Prior	338		322
Revolving Loans	13,398		13,225
Total loans	17,149		23,524
Commercial Business | Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,255		2,902
Year one	2,231		1,611
Year two	1,766		1,094
Year three	994		2,030
Year four	2,581		449
Prior	1,818		2,121
Revolving Loans	3,822		1,863
Total loans	14,467		12,070
Commercial Business | Commercial business | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	0		0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	5,601		7,626
Year one	6,964		2,926
Year two	2,867		1,300
Year three	1,256		2,943
Year four	2,774		3,236
Prior	34,772		34,349
Revolving Loans	368,271		380,577
Total loans	422,505		432,957
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	1		5
Current period gross charge-offs, year two	0		15
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		13
Current period gross charge-offs, prior	1,594		20
Current period gross charge-offs, revolving	87		181
Current period gross charge-offs, Total	1,682		234
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4,743		6,689
Year one	6,164		2,346
Year two	2,515		1,201
Year three	764		2,147
Year four	2,048		2,047
Prior	24,430		23,170
Revolving Loans	344,560		359,468
Total loans	385,224		397,068
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	325		658
Year one	543		467
Year two	21		59
Year three	163		198
Year four	113		664
Prior	5,299		5,459
Revolving Loans	12,686		11,269
Total loans	19,150		18,774
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	309		123
Year one	79		56
Year two	83		0
Year three	38		465
Year four	127		316
Prior	2,293		2,802
Revolving Loans	4,456		3,824
Total loans	7,385		7,586
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	224		156
Year one	178		57
Year two	248		40
Year three	291		133
Year four	486		209
Prior	2,750		2,918
Revolving Loans	6,569		6,016
Total loans	$ 10,746		$ 9,529