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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loan Risk by Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Current period gross write-offs
Total	$ 7,685	$ 1,598	$ 15,621	$ 7,645
Term Loans Amortized Cost Basis by Origination Year
Total loans	8,882,402		8,882,402		$ 8,335,309
Construction and commercial multifamily | Construction
Current period gross write-offs
Write-offs, originated in current year			0
Write-offs, originated in prior year			0
Write-offs, originated two years before current year			0
Write-offs, originated three years before current year			0
Write-offs, originated four years before current year			0
Write-offs, originated five years before current year			1
Write-offs, Revolving Loans Amortized Cost Basis			0
Write-offs, Revolving Loans Converted to Term			0
Total	1	0	1	0
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	39,770		39,770		153,393
Loans originated in fiscal year before current fiscal year	220,919		220,919		133,708
Loans originated two years before current fiscal year	152,824		152,824		25,634
Loans originated three years before current fiscal year	26,884		26,884		3,432
Loans originated four years before current fiscal year	2,961		2,961		1,361
Loans originated more than five years before current fiscal year	498		498		1,924
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	443,856		443,856		319,452
Construction and commercial multifamily | Commercial multifamily
Current period gross write-offs
Write-offs, originated in current year			0
Write-offs, originated in prior year			0
Write-offs, originated two years before current year			0
Write-offs, originated three years before current year			0
Write-offs, originated four years before current year			0
Write-offs, originated five years before current year			0
Write-offs, Revolving Loans Amortized Cost Basis			0
Write-offs, Revolving Loans Converted to Term			0
Total	0	0	0	0
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	9,125		9,125		205,124
Loans originated in fiscal year before current fiscal year	204,033		204,033		61,032
Loans originated two years before current fiscal year	52,876		52,876		30,211
Loans originated three years before current fiscal year	29,867		29,867		100,696
Loans originated four years before current fiscal year	96,568		96,568		73,187
Loans originated more than five years before current fiscal year	204,029		204,029		149,633
Revolving Loans Amortized Cost Basis	974		974		205
Revolving Loans Converted to Term	0		0		0
Total loans	597,472		597,472		620,088
Commercial real estate | Commercial real estate owner occupied
Current period gross write-offs
Write-offs, originated in current year			0
Write-offs, originated in prior year			0
Write-offs, originated two years before current year			0
Write-offs, originated three years before current year			380
Write-offs, originated four years before current year			0
Write-offs, originated five years before current year			84
Write-offs, Revolving Loans Amortized Cost Basis			0
Write-offs, Revolving Loans Converted to Term			0
Total	394	298	464	428
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	51,966		51,966		132,099
Loans originated in fiscal year before current fiscal year	128,196		128,196		127,392
Loans originated two years before current fiscal year	131,904		131,904		59,253
Loans originated three years before current fiscal year	50,742		50,742		82,858
Loans originated four years before current fiscal year	102,821		102,821		76,378
Loans originated more than five years before current fiscal year	229,604		229,604		159,045
Revolving Loans Amortized Cost Basis	1,538		1,538		3,464
Revolving Loans Converted to Term	0		0		0
Total loans	696,771		696,771		640,489
Commercial real estate | Commercial real estate non-owner occupied
Current period gross write-offs
Write-offs, originated in current year			0
Write-offs, originated in prior year			0
Write-offs, originated two years before current year			0
Write-offs, originated three years before current year			0
Write-offs, originated four years before current year			0
Write-offs, originated five years before current year			0
Write-offs, Revolving Loans Amortized Cost Basis			0
Write-offs, Revolving Loans Converted to Term			0
Total	0	0	0	4,884
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	208,347		208,347		621,685
Loans originated in fiscal year before current fiscal year	630,930		630,930		410,359
Loans originated two years before current fiscal year	391,646		391,646		182,693
Loans originated three years before current fiscal year	179,260		179,260		347,406
Loans originated four years before current fiscal year	301,771		301,771		348,734
Loans originated more than five years before current fiscal year	827,694		827,694		567,514
Revolving Loans Amortized Cost Basis	17,388		17,388		17,846
Revolving Loans Converted to Term	0		0		0
Total loans	2,557,036		2,557,036		2,496,237
Commercial and industrial
Current period gross write-offs
Write-offs, originated in current year			0
Write-offs, originated in prior year			0
Write-offs, originated two years before current year			395
Write-offs, originated three years before current year			1,656
Write-offs, originated four years before current year			733
Write-offs, originated five years before current year			5,531
Write-offs, Revolving Loans Amortized Cost Basis			2,312
Write-offs, Revolving Loans Converted to Term			0
Total	4,595	752	10,627	1,405
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	96,104		96,104		282,985
Loans originated in fiscal year before current fiscal year	245,278		245,278		153,377
Loans originated two years before current fiscal year	144,313		144,313		61,810
Loans originated three years before current fiscal year	49,133		49,133		77,446
Loans originated four years before current fiscal year	56,893		56,893		96,706
Loans originated more than five years before current fiscal year	193,732		193,732		103,134
Revolving Loans Amortized Cost Basis	652,609		652,609		669,778
Revolving Loans Converted to Term	0		0		0
Total loans	1,438,062		1,438,062		1,445,236
Residential real estate | Residential real estate
Current period gross write-offs
Write-offs, originated in current year			0
Write-offs, originated in prior year			50
Write-offs, originated two years before current year			0
Write-offs, originated three years before current year			0
Write-offs, originated four years before current year			174
Write-offs, originated five years before current year			16
Write-offs, Revolving Loans Amortized Cost Basis			0
Write-offs, Revolving Loans Converted to Term			0
Total	210	216	240	380
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	419,626		419,626		997,981
Loans originated in fiscal year before current fiscal year	997,700		997,700		280,956
Loans originated two years before current fiscal year	273,501		273,501		96,996
Loans originated three years before current fiscal year	93,213		93,213		71,973
Loans originated four years before current fiscal year	71,287		71,287		140,953
Loans originated more than five years before current fiscal year	821,525		821,525		723,423
Revolving Loans Amortized Cost Basis	201		201		165
Revolving Loans Converted to Term	0		0		0
Total loans	2,677,053		2,677,053		2,312,447
Consumer loans | Home equity
Current period gross write-offs
Write-offs, originated in current year	0
Write-offs, originated in prior year	0
Write-offs, originated two years before current year	0
Write-offs, originated three years before current year	0
Write-offs, originated four years before current year	0
Write-offs, originated five years before current year	0
Write-offs, Revolving Loans Amortized Cost Basis	18
Write-offs, Revolving Loans Converted to Term	0
Total	7	0	18	0
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		114
Loans originated two years before current fiscal year	108		108		454
Loans originated three years before current fiscal year	446		446		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	2,523		2,523		17
Revolving Loans Amortized Cost Basis	222,357		222,357		226,865
Revolving Loans Converted to Term	0		0		0
Total loans	225,434		225,434		227,450
Consumer loans | Home equity | Performing
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		114
Loans originated two years before current fiscal year	108		108		454
Loans originated three years before current fiscal year	446		446		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	2,523		2,523		17
Revolving Loans Amortized Cost Basis	220,260		220,260		224,746
Revolving Loans Converted to Term	0		0		0
Total loans	223,337		223,337		225,331
Consumer loans | Home equity | Nonperforming
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	0		0		0
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	0		0		0
Revolving Loans Amortized Cost Basis	2,097		2,097		2,119
Revolving Loans Converted to Term	0		0		0
Total loans	2,097		2,097		2,119
Consumer loans | Consumer other
Current period gross write-offs
Write-offs, originated in current year	1
Write-offs, originated in prior year	3,622
Write-offs, originated two years before current year	466
Write-offs, originated three years before current year	7
Write-offs, originated four years before current year	33
Write-offs, originated five years before current year	142
Write-offs, Revolving Loans Amortized Cost Basis	0
Write-offs, Revolving Loans Converted to Term	0
Total	2,478	$ 332	4,271	$ 548
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	26,467		26,467		161,745
Loans originated in fiscal year before current fiscal year	135,192		135,192		28,416
Loans originated two years before current fiscal year	24,098		24,098		8,356
Loans originated three years before current fiscal year	7,117		7,117		12,950
Loans originated four years before current fiscal year	9,739		9,739		28,085
Loans originated more than five years before current fiscal year	33,895		33,895		25,249
Revolving Loans Amortized Cost Basis	10,210		10,210		9,109
Revolving Loans Converted to Term	0		0		0
Total loans	246,718		246,718		273,910
Consumer loans | Consumer other | Performing
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	26,460		26,460		161,157
Loans originated in fiscal year before current fiscal year	134,609		134,609		28,279
Loans originated two years before current fiscal year	23,959		23,959		8,312
Loans originated three years before current fiscal year	7,082		7,082		12,670
Loans originated four years before current fiscal year	9,591		9,591		27,608
Loans originated more than five years before current fiscal year	33,090		33,090		24,682
Revolving Loans Amortized Cost Basis	10,208		10,208		9,070
Revolving Loans Converted to Term	0		0		0
Total loans	244,999		244,999		271,778
Consumer loans | Consumer other | Nonperforming
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	7		7		588
Loans originated in fiscal year before current fiscal year	583		583		137
Loans originated two years before current fiscal year	139		139		44
Loans originated three years before current fiscal year	35		35		280
Loans originated four years before current fiscal year	148		148		477
Loans originated more than five years before current fiscal year	805		805		567
Revolving Loans Amortized Cost Basis	2		2		39
Revolving Loans Converted to Term	0		0		0
Total loans	1,719		1,719		2,132
Pass | Construction and commercial multifamily | Construction
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	39,770		39,770		153,393
Loans originated in fiscal year before current fiscal year	220,919		220,919		133,708
Loans originated two years before current fiscal year	136,426		136,426		25,634
Loans originated three years before current fiscal year	26,884		26,884		3,432
Loans originated four years before current fiscal year	2,961		2,961		1,361
Loans originated more than five years before current fiscal year	498		498		1,924
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	427,458		427,458		319,452
Pass | Construction and commercial multifamily | Commercial multifamily
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	9,125		9,125		205,124
Loans originated in fiscal year before current fiscal year	204,033		204,033		61,032
Loans originated two years before current fiscal year	52,630		52,630		27,583
Loans originated three years before current fiscal year	27,276		27,276		100,696
Loans originated four years before current fiscal year	96,568		96,568		67,675
Loans originated more than five years before current fiscal year	198,555		198,555		149,633
Revolving Loans Amortized Cost Basis	974		974		205
Revolving Loans Converted to Term	0		0		0
Total loans	589,161		589,161		611,948
Pass | Commercial real estate | Commercial real estate owner occupied
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	51,966		51,966		131,096
Loans originated in fiscal year before current fiscal year	128,185		128,185		127,270
Loans originated two years before current fiscal year	131,822		131,822		58,835
Loans originated three years before current fiscal year	50,248		50,248		82,576
Loans originated four years before current fiscal year	98,040		98,040		75,322
Loans originated more than five years before current fiscal year	223,794		223,794		154,056
Revolving Loans Amortized Cost Basis	1,538		1,538		3,464
Revolving Loans Converted to Term	0		0		0
Total loans	685,593		685,593		632,619
Pass | Commercial real estate | Commercial real estate non-owner occupied
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	208,347		208,347		621,685
Loans originated in fiscal year before current fiscal year	630,930		630,930		410,359
Loans originated two years before current fiscal year	391,646		391,646		175,456
Loans originated three years before current fiscal year	172,266		172,266		333,783
Loans originated four years before current fiscal year	248,566		248,566		313,124
Loans originated more than five years before current fiscal year	792,740		792,740		530,322
Revolving Loans Amortized Cost Basis	17,388		17,388		17,846
Revolving Loans Converted to Term	0		0		0
Total loans	2,461,883		2,461,883		2,402,575
Pass | Commercial and industrial
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	95,442		95,442		282,781
Loans originated in fiscal year before current fiscal year	240,907		240,907		147,070
Loans originated two years before current fiscal year	132,980		132,980		56,880
Loans originated three years before current fiscal year	43,719		43,719		67,975
Loans originated four years before current fiscal year	48,622		48,622		83,223
Loans originated more than five years before current fiscal year	178,417		178,417		99,367
Revolving Loans Amortized Cost Basis	619,184		619,184		648,956
Revolving Loans Converted to Term	0		0		0
Total loans	1,359,271		1,359,271		1,386,252
Pass | Residential real estate | Residential real estate
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	419,626		419,626		997,981
Loans originated in fiscal year before current fiscal year	997,566		997,566		280,308
Loans originated two years before current fiscal year	271,542		271,542		96,548
Loans originated three years before current fiscal year	92,781		92,781		70,845
Loans originated four years before current fiscal year	69,856		69,856		138,894
Loans originated more than five years before current fiscal year	810,003		810,003		713,744
Revolving Loans Amortized Cost Basis	201		201		165
Revolving Loans Converted to Term	0		0		0
Total loans	2,661,575		2,661,575		2,298,485
Special Mention | Performing
Term Loans Amortized Cost Basis by Origination Year
Total loans	99,318		99,318		68,127
Special Mention | Construction and commercial multifamily | Construction
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	0		0		0
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	0		0		0
Special Mention | Construction and commercial multifamily | Commercial multifamily
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	0		0		2,628
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	0		0		2,628
Special Mention | Commercial real estate | Commercial real estate owner occupied
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	11		11		0
Loans originated two years before current fiscal year	0		0		387
Loans originated three years before current fiscal year	387		387		0
Loans originated four years before current fiscal year	4,412		4,412		0
Loans originated more than five years before current fiscal year	200		200		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	5,010		5,010		387
Special Mention | Commercial real estate | Commercial real estate non-owner occupied
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	0		0		0
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	47,261		47,261		20,000
Loans originated more than five years before current fiscal year	9,966		9,966		18,462
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	57,227		57,227		38,462
Special Mention | Commercial and industrial
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	175		175		0
Loans originated in fiscal year before current fiscal year	3,369		3,369		5,811
Loans originated two years before current fiscal year	1,830		1,830		1,290
Loans originated three years before current fiscal year	2,257		2,257		1,332
Loans originated four years before current fiscal year	1,986		1,986		11,502
Loans originated more than five years before current fiscal year	1,854		1,854		912
Revolving Loans Amortized Cost Basis	21,159		21,159		2,632
Revolving Loans Converted to Term	0		0		0
Total loans	32,630		32,630		23,479
Special Mention | Residential real estate | Residential real estate
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		364
Loans originated two years before current fiscal year	1,378		1,378		0
Loans originated three years before current fiscal year	0		0		861
Loans originated four years before current fiscal year	237		237		202
Loans originated more than five years before current fiscal year	910		910		707
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	2,525		2,525		2,134
Substandard | Performing
Term Loans Amortized Cost Basis by Origination Year
Total loans	103,327		103,327		88,665
Substandard | Construction and commercial multifamily | Construction
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	16,398		16,398		0
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	0		0		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	16,398		16,398		0
Substandard | Construction and commercial multifamily | Commercial multifamily
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	246		246		0
Loans originated three years before current fiscal year	2,591		2,591		0
Loans originated four years before current fiscal year	0		0		5,512
Loans originated more than five years before current fiscal year	5,474		5,474		0
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	8,311		8,311		5,512
Substandard | Commercial real estate | Commercial real estate owner occupied
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		1,003
Loans originated in fiscal year before current fiscal year	0		0		122
Loans originated two years before current fiscal year	82		82		31
Loans originated three years before current fiscal year	107		107		282
Loans originated four years before current fiscal year	369		369		1,056
Loans originated more than five years before current fiscal year	5,610		5,610		4,989
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	6,168		6,168		7,483
Substandard | Commercial real estate | Commercial real estate non-owner occupied
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	0		0		7,237
Loans originated three years before current fiscal year	6,994		6,994		13,623
Loans originated four years before current fiscal year	5,944		5,944		15,610
Loans originated more than five years before current fiscal year	24,988		24,988		18,730
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	37,926		37,926		55,200
Substandard | Commercial and industrial
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	487		487		204
Loans originated in fiscal year before current fiscal year	1,002		1,002		496
Loans originated two years before current fiscal year	9,503		9,503		3,640
Loans originated three years before current fiscal year	3,157		3,157		8,139
Loans originated four years before current fiscal year	6,285		6,285		1,981
Loans originated more than five years before current fiscal year	13,414		13,414		2,799
Revolving Loans Amortized Cost Basis	9,272		9,272		10,581
Revolving Loans Converted to Term	0		0		0
Total loans	43,120		43,120		27,840
Substandard | Residential real estate | Residential real estate
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	134		134		284
Loans originated two years before current fiscal year	581		581		448
Loans originated three years before current fiscal year	432		432		267
Loans originated four years before current fiscal year	1,194		1,194		1,857
Loans originated more than five years before current fiscal year	10,612		10,612		8,972
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	12,953		12,953		11,828
Doubtful | Commercial and industrial
Term Loans Amortized Cost Basis by Origination Year
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		0
Loans originated two years before current fiscal year	0		0		0
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	0		0		0
Loans originated more than five years before current fiscal year	47		47		56
Revolving Loans Amortized Cost Basis	2,994		2,994		7,609
Revolving Loans Converted to Term	0		0		0
Total loans	$ 3,041		$ 3,041		$ 7,665

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