CREDIT QUALITY ASSESSMENT - Information about Credit Quality Indicator by Year of Origination (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 2,651,430		$ 3,023,908
Year one	2,703,296		1,626,031
Year two	1,377,543		1,316,007
Year three	1,092,030		826,781
Year four	685,031		702,719
Prior	1,639,528		1,376,294
Revolving Loans	1,069,955		1,095,351
Total loans	11,218,813		9,967,091
Current period gross charge-offs, Total	1,029	$ 11,496	12,313
Commercial investor real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,414,698		1,394,986
Year one	1,292,530		749,082
Year two	675,145		625,715
Year three	556,279		366,804
Year four	320,889		340,595
Prior	790,645		644,925
Revolving Loans	16,657		19,239
Total loans	5,066,843		4,141,346
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		903
Current period gross charge-offs, year four	0		3,975
Current period gross charge-offs, prior	0		924
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	0		5,802
Commercial investor real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,381,369		1,391,969
Year one	1,273,121		748,236
Year two	672,407		616,761
Year three	553,928		357,640
Year four	311,952		328,327
Prior	781,407		633,913
Revolving Loans	16,657		19,239
Total loans	4,990,841		4,096,085
Commercial investor real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	22,470		2,210
Year one	17,199		510
Year two	2,738		4,646
Year three	95		596
Year four	804		2,204
Prior	5,355		10,438
Revolving Loans	0		0
Total loans	48,661		20,604
Commercial investor real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	10,859		807
Year one	2,210		336
Year two	0		4,308
Year three	2,256		8,568
Year four	8,133		10,064
Prior	3,883		574
Revolving Loans	0		0
Total loans	27,341		24,657
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	347,659		362,293
Year one	326,173		257,626
Year two	235,129		327,764
Year three	269,107		189,716
Year four	152,736		177,164
Prior	412,020		375,169
Revolving Loans	900		1,149
Total loans	1,743,724		1,690,881
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		136
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		136
Commercial owner-occupied real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	340,349		360,169
Year one	326,010		254,350
Year two	233,459		319,348
Year three	260,539		178,416
Year four	148,150		172,354
Prior	402,013		363,685
Revolving Loans	900		1,149
Total loans	1,711,420		1,649,471
Commercial owner-occupied real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	5,587		156
Year one	0		1,476
Year two	916		4,388
Year three	622		9,035
Year four	2,090		4,456
Prior	6,753		9,106
Revolving Loans	0		0
Total loans	15,968		28,617
Commercial owner-occupied real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,723		1,968
Year one	163		1,800
Year two	754		4,028
Year three	7,946		2,265
Year four	2,496		354
Prior	3,254		2,378
Revolving Loans	0		0
Total loans	16,336		12,793
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	231,277		457,444
Year one	425,329		226,332
Year two	167,110		148,561
Year three	88,831		87,934
Year four	57,611		13,938
Prior	0		0
Revolving Loans	173,625		153,885
Total loans	1,143,783		1,088,094
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		2,007
Current period gross charge-offs, prior	0		0
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	0		2,007
Commercial AD&C | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	231,277		454,207
Year one	424,256		226,332
Year two	167,110		148,260
Year three	88,831		87,934
Year four	57,611		13,938
Prior	0		0
Revolving Loans	172,830		152,896
Total loans	1,141,915		1,083,567
Commercial AD&C | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		2,888
Year one	1,073		0
Year two	0		0
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	795		989
Total loans	1,868		3,877
Commercial AD&C | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		349
Year one	0		0
Year two	0		301
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	0		650
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	301,175		259,638
Year one	313,852		175,065
Year two	173,609		54,245
Year three	50,693		76,471
Year four	64,789		110,951
Prior	314,434		261,200
Revolving Loans	0		0
Total loans	1,218,552		937,570
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	130		0
Current period gross charge-offs, revolving	0		0
Current period gross charge-offs, Total	130		0
Residential mortgage | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	293,717		246,612
Year one	292,392		165,623
Year two	167,273		46,925
Year three	44,299		65,865
Year four	56,623		102,628
Prior	271,371		223,420
Revolving Loans	0		0
Total loans	1,125,675		851,073
Residential mortgage | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4,876		11,102
Year one	15,609		3,285
Year two	2,695		3,583
Year three	2,820		4,255
Year four	3,878		4,645
Prior	26,061		20,052
Revolving Loans	0		0
Total loans	55,939		46,922
Residential mortgage | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,501		1,472
Year one	1,914		1,864
Year two	1,251		2,162
Year three	1,786		4,522
Year four	2,538		1,599
Prior	6,504		8,201
Revolving Loans	0		0
Total loans	15,494		19,820
Residential mortgage | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,081		452
Year one	3,937		4,293
Year two	2,390		1,575
Year three	1,788		1,829
Year four	1,750		2,079
Prior	10,498		9,527
Revolving Loans	0		0
Total loans	21,444		19,755
Residential construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	99,814		138,002
Year one	107,825		45,890
Year two	17,328		8,713
Year three	1,683		2,078
Year four	1,432		1,347
Prior	1,161		1,622
Revolving Loans	0		0
Total loans	229,243		197,652
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	99,230		134,335
Year one	106,230		45,890
Year two	17,328		8,063
Year three	1,683		2,078
Year four	1,432		1,347
Prior	1,161		1,160
Revolving Loans	0		0
Total loans	227,064		192,873
Residential construction | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		1,922
Year one	1,595		0
Year two	0		650
Year three	0		0
Year four	0		0
Prior	0		0
Revolving Loans	0		0
Total loans	1,595		2,572
Residential construction | 540-599
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		462
Revolving Loans	0		0
Total loans	0		462
Residential construction | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	584		1,745
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	584		1,745
Commercial Business
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,347,984		8,402,155
Commercial Business | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	252,537		407,868
Year one	234,534		170,454
Year two	107,835		146,708
Year three	122,339		99,298
Year four	84,096		56,459
Prior	85,361		56,406
Revolving Loans	506,932		544,641
Total loans	1,393,634		1,481,834
Current period gross charge-offs, current year	174		0
Current period gross charge-offs, year one	0		0
Current period gross charge-offs, year two	0		88
Current period gross charge-offs, year three	0		1,674
Current period gross charge-offs, year four	138		46
Current period gross charge-offs, prior	404		2,236
Current period gross charge-offs, revolving	0		25
Current period gross charge-offs, Total	716		4,069
Commercial Business | Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	250,297		403,871
Year one	232,246		165,194
Year two	105,358		137,069
Year three	111,407		96,800
Year four	82,473		55,100
Prior	82,304		53,764
Revolving Loans	491,495		533,893
Total loans	1,355,580		1,445,691
Commercial Business | Commercial business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	107		220
Year one	493		1,998
Year two	1,188		7,030
Year three	8,770		1,701
Year four	1,032		548
Prior	736		577
Revolving Loans	14,006		9,212
Total loans	26,332		21,286
Commercial Business | Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,133		3,777
Year one	1,795		3,262
Year two	1,289		2,609
Year three	2,162		797
Year four	591		811
Prior	2,321		2,065
Revolving Loans	1,431		1,536
Total loans	11,722		14,857
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	4,270		3,677
Year one	3,053		1,582
Year two	1,387		4,301
Year three	3,098		4,480
Year four	3,478		2,265
Prior	35,907		36,972
Revolving Loans	371,841		376,437
Total loans	423,034		429,714
Current period gross charge-offs, current year	0		0
Current period gross charge-offs, year one	5		0
Current period gross charge-offs, year two	15		7
Current period gross charge-offs, year three	0		2
Current period gross charge-offs, year four	13		0
Current period gross charge-offs, prior	16		106
Current period gross charge-offs, revolving	134		184
Current period gross charge-offs, Total	183		299
Consumer | 660-850
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	3,526		3,179
Year one	2,565		1,393
Year two	1,288		3,130
Year three	2,088		3,060
Year four	2,663		1,648
Prior	24,438		26,156
Revolving Loans	350,546		350,466
Total loans	387,114		389,032
Consumer | 600-659
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	575		352
Year one	319		123
Year two	32		324
Year three	331		716
Year four	333		430
Prior	5,009		4,906
Revolving Loans	12,360		14,119
Total loans	18,959		20,970
Consumer | 540-599
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	36		58
Year one	63		8
Year two	26		311
Year three	509		160
Year four	109		89
Prior	3,294		2,809
Revolving Loans	3,770		4,926
Total loans	7,807		8,361
Consumer | less than 540
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	133		88
Year one	106		58
Year two	41		536
Year three	170		544
Year four	373		98
Prior	3,166		3,101
Revolving Loans	5,165		6,926
Total loans	$ 9,154		$ 11,351