CREDIT QUALITY ASSESSMENT - Information about Credit Quality Indicator by Year of Origination (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 758,026		$ 1,245,085
Year one	1,004,200		2,958,596
Year two	2,925,317		2,375,873
Year three	2,281,568		1,175,656
Year four	1,088,154		870,390
Prior	2,428,592		1,776,440
Revolving Loans	998,064		964,949
Total loans	11,483,921		11,366,989
Current period gross charge-offs, Total	1,939	$ 2,265	2,614
Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	249,451		445,782
Year one	318,959		1,396,438
Year two	1,301,905		1,226,951
Year three	1,189,938		634,361
Year four	593,882		511,146
Prior	1,251,211		865,346
Revolving Loans	27,983		24,401
Total loans	4,933,329		5,104,425
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	1		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	1		0
Commercial investor real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	195,837		405,740
Year one	309,794		1,395,973
Year two	1,301,450		1,195,708
Year three	1,161,385		634,361
Year four	577,096		511,146
Prior	1,199,951		848,958
Revolving Loans	27,983		23,653
Total loans	4,773,496		5,015,539
Commercial investor real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	21,360		9,250
Year one	5,580		0
Year two	0		316
Year three	309		0
Year four	15,790		0
Prior	23,334		1,978
Revolving Loans	0		0
Total loans	66,373		11,544
Commercial investor real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	32,254		30,792
Year one	3,585		465
Year two	455		30,927
Year three	28,244		0
Year four	996		0
Prior	27,926		14,410
Revolving Loans	0		748
Total loans	93,460		77,342
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	91,236		139,040
Year one	118,262		364,951
Year two	353,617		321,310
Year three	310,880		239,979
Year four	232,050		243,278
Prior	636,437		441,056
Revolving Loans	5,226		5,621
Total loans	1,747,708		1,755,235
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	91,204		136,072
Year one	114,232		361,247
Year two	349,017		318,269
Year three	307,859		238,761
Year four	230,851		235,145
Prior	613,978		428,846
Revolving Loans	5,226		5,621
Total loans	1,712,367		1,723,961
Commercial owner-occupied real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	32		406
Year one	3,460		70
Year two	1,800		2,240
Year three	58		875
Year four	863		2,267
Prior	9,844		8,616
Revolving Loans	0		0
Total loans	16,057		14,474
Commercial owner-occupied real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		2,562
Year one	570		3,634
Year two	2,800		801
Year three	2,963		343
Year four	336		5,866
Prior	12,615		3,594
Revolving Loans	0		0
Total loans	19,284		16,800
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	197,957		335,934
Year one	302,109		289,301
Year two	386,992		178,889
Year three	157,836		28,954
Year four	4,942		0
Prior	0		0
Revolving Loans	134,460		155,889
Total loans	1,184,296		988,967
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	195,714		334,918
Year one	300,538		288,732
Year two	358,564		178,889
Year three	136,334		28,954
Year four	4,942		0
Prior	0		0
Revolving Loans	134,460		155,889
Total loans	1,130,552		987,382
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,121		0
Year one	0		0
Year two	27,994		0
Year three	21,502		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	51,617		0
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	122		1,016
Year one	1,571		569
Year two	434		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	2,127		1,585
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	15,571		32,863
Year one	43,917		487,240
Year two	527,702		418,747
Year three	422,579		173,191
Year four	169,709		47,779
Prior	342,412		314,701
Revolving Loans	0		0
Total loans	1,521,890		1,474,521
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		43
Current period gross charge-offs, year three	50		0
Current period gross charge-offs, year four	0		10
Current period gross charge-offs, prior	0		107
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	50		160
Residential mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	15,561		31,853
Year one	41,076		476,631
Year two	509,458		394,414
Year three	395,278		166,387
Year four	161,201		41,473
Prior	288,775		266,927
Revolving Loans	0		0
Total loans	1,411,349		1,377,685
Residential mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	10		781
Year one	1,114		7,022
Year two	14,701		18,284
Year three	19,073		2,009
Year four	3,787		1,882
Prior	25,967		24,040
Revolving Loans	0		0
Total loans	64,652		54,018
Residential mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Year one	1,200		1,545
Year two	2,237		2,698
Year three	3,140		2,371
Year four	2,976		1,891
Prior	10,997		9,377
Revolving Loans	0		0
Total loans	20,550		17,882
Residential mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		229
Year one	527		2,042
Year two	1,306		3,351
Year three	5,088		2,424
Year four	1,745		2,533
Prior	16,673		14,357
Revolving Loans	0		0
Total loans	25,339		24,936
Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4,083		24,059
Year one	27,132		68,773
Year two	29,571		23,216
Year three	12,201		3,978
Year four	3,582		150
Prior	1,458		1,243
Revolving Loans	0		0
Total loans	78,027		121,419
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	3,544		21,975
Year one	27,132		68,273
Year two	27,805		21,897
Year three	12,201		2,478
Year four	2,082		150
Prior	150		0
Revolving Loans	0		0
Total loans	72,914		114,773
Residential construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		1,641
Year one	0		500
Year two	0		1,319
Year three	0		1,500
Year four	0		0
Prior	1,308		1,243
Revolving Loans	0		0
Total loans	1,308		6,203
Residential construction | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	539		443
Year one	0		0
Year two	1,766		0
Year three	0		0
Year four	1,500		0
Prior	0		0
Revolving Loans	0		0
Total loans	3,805		443
Residential construction | less than 540
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 Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,466,843		9,353,507
Commercial Business | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	193,941		254,338
Year one	182,933		346,152
Year two	320,416		204,481
Year three	186,037		94,152
Year four	82,910		65,378
Prior	162,841		119,926
Revolving Loans	472,432		420,453
Total loans	1,601,510		1,504,880
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		9
Current period gross charge-offs, year two	612		324
Current period gross charge-offs, year three	0		0
Current period gross charge-offs, year four	0		0
Current period gross charge-offs, prior	939		116
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	1,551		449
Commercial Business | Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	190,155		247,081
Year one	180,085		344,034
Year two	315,120		202,020
Year three	181,772		92,198
Year four	81,362		62,413
Prior	160,139		118,061
Revolving Loans	445,419		410,856
Total loans	1,554,052		1,476,663
Commercial Business | Commercial business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	675		532
Year one	711		45
Year two	3,919		180
Year three	1,689		1,037
Year four	274		1,040
Prior	605		294
Revolving Loans	20,945		3,635
Total loans	28,818		6,763
Commercial Business | Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	3,111		6,725
Year one	2,137		2,073
Year two	1,377		2,281
Year three	2,576		917
Year four	1,274		1,925
Prior	2,097		1,571
Revolving Loans	6,068		5,962
Total loans	18,640		21,454
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	5,787		13,069
Year one	10,888		5,741
Year two	5,114		2,279
Year three	2,097		1,041
Year four	1,079		2,659
Prior	34,233		34,168
Revolving Loans	357,963		358,585
Total loans	417,161		417,542
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	0		20
Current period gross charge-offs, year two	0		28
Current period gross charge-offs, year three	5		0
Current period gross charge-offs, year four	0		15
Current period gross charge-offs, prior	14		1,735
Current period gross charge-offs, revolving	318		207
Current period gross charge-offs, Total	337		2,005
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	5,524		11,452
Year one	8,412		4,960
Year two	4,209		1,823
Year three	1,657		519
Year four	694		1,662
Prior	26,383		24,543
Revolving Loans	330,123		333,382
Total loans	377,002		378,341
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	191		1,209
Year one	1,731		192
Year two	201		237
Year three	62		425
Year four	60		209
Prior	2,640		3,954
Revolving Loans	15,256		12,668
Total loans	20,141		18,894
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4		24
Year one	394		374
Year two	417		87
Year three	122		47
Year four	146		500
Prior	2,617		2,868
Revolving Loans	4,195		5,920
Total loans	7,895		9,820
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	68		384
Year one	351		215
Year two	287		132
Year three	256		50
Year four	179		288
Prior	2,593		2,803
Revolving Loans	8,389		6,615
Total loans	$ 12,123		$ 10,487