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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loan Risk by Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Current period gross write-offs
Total	$ 7,091	$ 6,744	$ 15,972	$ 22,365
Payment performance
Total loans	9,212,322		9,212,322		$ 9,039,686
Special Mention | Performing
Payment performance
Total loans	104,832		104,832		91,502
Substandard | Performing
Payment performance
Total loans	102,830		102,830		131,689
Construction and commercial multifamily | Construction
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			0		0
Write-offs, originated two years before current year			0		0
Write-offs, originated three years before current year			0		0
Write-offs, originated four years before current year			0		0
Write-offs, originated five years before current year			0		1
Write-offs, Revolving Loans Amortized Cost Basis			0		0
Write-offs, Revolving Loans Converted to Term			0		0
Total	0	0	0	1	1
Payment performance
Loans originated in current fiscal year	23,139		23,139		104,507
Loans originated in fiscal year before current fiscal year	124,651		124,651		346,419
Loans originated two years before current fiscal year	434,632		434,632		156,626
Loans originated three years before current fiscal year	78,017		78,017		29,176
Loans originated four years before current fiscal year	0		0		2,545
Loans originated more than five years before current fiscal year	1,138		1,138		1,098
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	661,577		661,577		640,371
Construction and commercial multifamily | Commercial multifamily
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			0		0
Write-offs, originated two years before current year			0		0
Write-offs, originated three years before current year			0		0
Write-offs, originated four years before current year			0		0
Write-offs, originated five years before current year			1,164		0
Write-offs, Revolving Loans Amortized Cost Basis			0		0
Write-offs, Revolving Loans Converted to Term			0		0
Total	1,164	0	1,164	0	0
Payment performance
Loans originated in current fiscal year	81,287		81,287		16,020
Loans originated in fiscal year before current fiscal year	18,097		18,097		216,477
Loans originated two years before current fiscal year	203,684		203,684		57,059
Loans originated three years before current fiscal year	69,833		69,833		29,120
Loans originated four years before current fiscal year	40,904		40,904		94,733
Loans originated more than five years before current fiscal year	249,173		249,173		185,359
Revolving Loans Amortized Cost Basis	506		506		377
Revolving Loans Converted to Term	0		0		0
Total loans	663,484		663,484		599,145
Construction and commercial multifamily | Pass | Construction
Payment performance
Loans originated in current fiscal year	23,139		23,139		104,507
Loans originated in fiscal year before current fiscal year	124,651		124,651		346,419
Loans originated two years before current fiscal year	434,632		434,632		138,802
Loans originated three years before current fiscal year	59,489		59,489		29,176
Loans originated four years before current fiscal year	0		0		2,545
Loans originated more than five years before current fiscal year	1,138		1,138		1,098
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	643,049		643,049		622,547
Construction and commercial multifamily | Pass | Commercial multifamily
Payment performance
Loans originated in current fiscal year	81,287		81,287		16,020
Loans originated in fiscal year before current fiscal year	18,097		18,097		216,477
Loans originated two years before current fiscal year	203,684		203,684		56,817
Loans originated three years before current fiscal year	69,594		69,594		26,566
Loans originated four years before current fiscal year	38,407		38,407		94,733
Loans originated more than five years before current fiscal year	244,800		244,800		179,923
Revolving Loans Amortized Cost Basis	506		506		377
Revolving Loans Converted to Term	0		0		0
Total loans	656,375		656,375		590,913
Construction and commercial multifamily | Special Mention | Construction
Payment performance
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		512
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		512
Construction and commercial multifamily | Special Mention | Commercial multifamily
Payment performance
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
Construction and commercial multifamily | Substandard | Construction
Payment performance
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		17,312
Loans originated three years before current fiscal year	18,528		18,528		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	18,528		18,528		17,312
Construction and commercial multifamily | Substandard | Commercial multifamily
Payment performance
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		242
Loans originated three years before current fiscal year	239		239		2,554
Loans originated four years before current fiscal year	2,497		2,497		0
Loans originated more than five years before current fiscal year	4,373		4,373		5,436
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	7,109		7,109		8,232
Commercial real estate | Commercial real estate owner occupied
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			0		0
Write-offs, originated two years before current year			45		0
Write-offs, originated three years before current year			57		380
Write-offs, originated four years before current year			0		0
Write-offs, originated five years before current year			126		109
Write-offs, Revolving Loans Amortized Cost Basis			0		0
Write-offs, Revolving Loans Converted to Term			0		0
Total	22	25	228	489	489
Payment performance
Loans originated in current fiscal year	88,637		88,637		97,271
Loans originated in fiscal year before current fiscal year	94,773		94,773		120,327
Loans originated two years before current fiscal year	160,232		160,232		122,656
Loans originated three years before current fiscal year	106,891		106,891		38,183
Loans originated four years before current fiscal year	69,287		69,287		75,096
Loans originated more than five years before current fiscal year	246,235		246,235		172,460
Revolving Loans Amortized Cost Basis	3,373		3,373		2,653
Revolving Loans Converted to Term	0		0		0
Total loans	769,428		769,428		628,646
Commercial real estate | Commercial real estate non-owner occupied
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			0		0
Write-offs, originated two years before current year			0		0
Write-offs, originated three years before current year			0		0
Write-offs, originated four years before current year			0		0
Write-offs, originated five years before current year			36		65
Write-offs, Revolving Loans Amortized Cost Basis			0		0
Write-offs, Revolving Loans Converted to Term			0		0
Total	36	1	36	1	65
Payment performance
Loans originated in current fiscal year	152,463		152,463		404,687
Loans originated in fiscal year before current fiscal year	423,575		423,575		591,897
Loans originated two years before current fiscal year	547,884		547,884		385,247
Loans originated three years before current fiscal year	417,343		417,343		142,177
Loans originated four years before current fiscal year	144,172		144,172		310,818
Loans originated more than five years before current fiscal year	934,195		934,195		767,030
Revolving Loans Amortized Cost Basis	8,066		8,066		4,553
Revolving Loans Converted to Term	1,500		1,500		0
Total loans	2,629,198		2,629,198		2,606,409
Commercial real estate | Pass | Commercial real estate owner occupied
Payment performance
Loans originated in current fiscal year	86,777		86,777		97,271
Loans originated in fiscal year before current fiscal year	93,390		93,390		120,327
Loans originated two years before current fiscal year	158,857		158,857		122,151
Loans originated three years before current fiscal year	98,990		98,990		37,914
Loans originated four years before current fiscal year	69,022		69,022		70,393
Loans originated more than five years before current fiscal year	234,095		234,095		165,224
Revolving Loans Amortized Cost Basis	3,373		3,373		2,653
Revolving Loans Converted to Term	0		0		0
Total loans	744,504		744,504		615,933
Commercial real estate | Pass | Commercial real estate non-owner occupied
Payment performance
Loans originated in current fiscal year	152,463		152,463		404,687
Loans originated in fiscal year before current fiscal year	423,575		423,575		591,897
Loans originated two years before current fiscal year	547,513		547,513		385,247
Loans originated three years before current fiscal year	414,539		414,539		135,134
Loans originated four years before current fiscal year	143,949		143,949		277,870
Loans originated more than five years before current fiscal year	865,768		865,768		736,566
Revolving Loans Amortized Cost Basis	5,810		5,810		4,553
Revolving Loans Converted to Term	1,500		1,500		0
Total loans	2,555,117		2,555,117		2,535,954
Commercial real estate | Special Mention | Commercial real estate owner occupied
Payment performance
Loans originated in current fiscal year	1,860		1,860		0
Loans originated in fiscal year before current fiscal year	1,383		1,383		0
Loans originated two years before current fiscal year	964		964		424
Loans originated three years before current fiscal year	7,129		7,129		222
Loans originated four years before current fiscal year	222		222		0
Loans originated more than five years before current fiscal year	5,052		5,052		788
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	16,610		16,610		1,434
Commercial real estate | Special Mention | Commercial real estate non-owner occupied
Payment performance
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		229
Loans originated four years before current fiscal year	223		223		19,465
Loans originated more than five years before current fiscal year	41,173		41,173		726
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	41,396		41,396		20,420
Commercial real estate | Substandard | Commercial real estate owner occupied
Payment performance
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	411		411		81
Loans originated three years before current fiscal year	772		772		47
Loans originated four years before current fiscal year	43		43		4,703
Loans originated more than five years before current fiscal year	7,088		7,088		6,448
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	8,314		8,314		11,279
Commercial real estate | Substandard | Commercial real estate non-owner occupied
Payment performance
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	371		371		0
Loans originated three years before current fiscal year	2,804		2,804		6,814
Loans originated four years before current fiscal year	0		0		13,483
Loans originated more than five years before current fiscal year	27,254		27,254		29,738
Revolving Loans Amortized Cost Basis	2,256		2,256		0
Revolving Loans Converted to Term	0		0		0
Total loans	32,685		32,685		50,035
Commercial and industrial
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			630		1,154
Write-offs, originated two years before current year			1,154		863
Write-offs, originated three years before current year			837		2,763
Write-offs, originated four years before current year			106		1,496
Write-offs, originated five years before current year			2,417		9,283
Write-offs, Revolving Loans Amortized Cost Basis			0		2,313
Write-offs, Revolving Loans Converted to Term			0		0
Total	1,731	3,997	5,144	14,625	17,872
Payment performance
Loans originated in current fiscal year	162,656		162,656		143,904
Loans originated in fiscal year before current fiscal year	109,904		109,904		227,036
Loans originated two years before current fiscal year	160,987		160,987		133,628
Loans originated three years before current fiscal year	112,561		112,561		72,478
Loans originated four years before current fiscal year	26,247		26,247		43,832
Loans originated more than five years before current fiscal year	127,808		127,808		126,661
Revolving Loans Amortized Cost Basis	678,543		678,543		611,710
Revolving Loans Converted to Term	1,262		1,262		0
Total loans	1,379,968		1,379,968		1,359,249
Commercial and industrial | Pass
Payment performance
Loans originated in current fiscal year	162,483		162,483		142,946
Loans originated in fiscal year before current fiscal year	106,993		106,993		203,126
Loans originated two years before current fiscal year	136,689		136,689		118,191
Loans originated three years before current fiscal year	99,758		99,758		69,722
Loans originated four years before current fiscal year	22,783		22,783		39,437
Loans originated more than five years before current fiscal year	112,678		112,678		112,770
Revolving Loans Amortized Cost Basis	645,314		645,314		554,153
Revolving Loans Converted to Term	1,110		1,110		0
Total loans	1,287,808		1,287,808		1,240,345
Commercial and industrial | Special Mention
Payment performance
Loans originated in current fiscal year	173		173		526
Loans originated in fiscal year before current fiscal year	1,641		1,641		23,149
Loans originated two years before current fiscal year	22,116		22,116		3,735
Loans originated three years before current fiscal year	1,386		1,386		1,621
Loans originated four years before current fiscal year	1,908		1,908		610
Loans originated more than five years before current fiscal year	2,368		2,368		1,353
Revolving Loans Amortized Cost Basis	13,721		13,721		35,244
Revolving Loans Converted to Term	0		0		0
Total loans	43,313		43,313		66,238
Commercial and industrial | Substandard
Payment performance
Loans originated in current fiscal year	0		0		432
Loans originated in fiscal year before current fiscal year	1,270		1,270		761
Loans originated two years before current fiscal year	2,182		2,182		11,702
Loans originated three years before current fiscal year	11,417		11,417		1,135
Loans originated four years before current fiscal year	1,556		1,556		3,785
Loans originated more than five years before current fiscal year	12,762		12,762		12,538
Revolving Loans Amortized Cost Basis	19,508		19,508		22,313
Revolving Loans Converted to Term	152		152		0
Total loans	48,847		48,847		52,666
Residential real estate | Residential real estate
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			0		50
Write-offs, originated two years before current year			0		0
Write-offs, originated three years before current year			0		50
Write-offs, originated four years before current year			0		174
Write-offs, originated five years before current year			45		39
Write-offs, Revolving Loans Amortized Cost Basis			0		0
Write-offs, Revolving Loans Converted to Term			0		0
Total	0	72	45	313	313
Payment performance
Loans originated in current fiscal year	215,826		215,826		599,124
Loans originated in fiscal year before current fiscal year	551,667		551,667		973,160
Loans originated two years before current fiscal year	925,946		925,946		267,231
Loans originated three years before current fiscal year	251,703		251,703		88,681
Loans originated four years before current fiscal year	80,959		80,959		67,551
Loans originated more than five years before current fiscal year	739,132		739,132		764,484
Revolving Loans Amortized Cost Basis	177		177		81
Revolving Loans Converted to Term	0		0		0
Total loans	2,765,410		2,765,410		2,760,312
Residential real estate | Pass | Residential real estate
Payment performance
Loans originated in current fiscal year	215,826		215,826		599,124
Loans originated in fiscal year before current fiscal year	551,667		551,667		973,031
Loans originated two years before current fiscal year	925,169		925,169		266,055
Loans originated three years before current fiscal year	250,784		250,784		88,302
Loans originated four years before current fiscal year	80,583		80,583		66,837
Loans originated more than five years before current fiscal year	730,662		730,662		755,372
Revolving Loans Amortized Cost Basis	177		177		81
Revolving Loans Converted to Term	0		0		0
Total loans	2,754,868		2,754,868		2,748,802
Residential real estate | Special Mention | Residential real estate
Payment performance
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	653		653		0
Loans originated three years before current fiscal year	0		0		0
Loans originated four years before current fiscal year	0		0		140
Loans originated more than five years before current fiscal year	1,227		1,227		664
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	1,880		1,880		804
Residential real estate | Substandard | Residential real estate
Payment performance
Loans originated in current fiscal year	0		0		0
Loans originated in fiscal year before current fiscal year	0		0		129
Loans originated two years before current fiscal year	124		124		1,176
Loans originated three years before current fiscal year	919		919		379
Loans originated four years before current fiscal year	376		376		574
Loans originated more than five years before current fiscal year	7,243		7,243		8,448
Revolving Loans Amortized Cost Basis	0		0		0
Revolving Loans Converted to Term	0		0		0
Total loans	8,662		8,662		10,706
Consumer | Home equity
Current period gross write-offs
Write-offs, originated in current year			0		0
Write-offs, originated in prior year			0		0
Write-offs, originated two years before current year			0		0
Write-offs, originated three years before current year			0		70
Write-offs, originated four years before current year			0		0
Write-offs, originated five years before current year			0		0
Write-offs, Revolving Loans Amortized Cost Basis			0		18
Write-offs, Revolving Loans Converted to Term			0		0
Total	0	71	0	88	88
Payment performance
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		439
Loans originated four years before current fiscal year	427		427		0
Loans originated more than five years before current fiscal year	2,462		2,462		2,614
Revolving Loans Amortized Cost Basis	218,534		218,534		221,170
Revolving Loans Converted to Term	0		0		0
Total loans	221,423		221,423		224,223
Consumer | Home equity | Performing
Payment performance
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		439
Loans originated four years before current fiscal year	427		427		0
Loans originated more than five years before current fiscal year	2,462		2,462		2,614
Revolving Loans Amortized Cost Basis	217,865		217,865		220,209
Revolving Loans Converted to Term	0		0		0
Total loans	220,754		220,754		223,262
Consumer | Home equity | Nonperforming
Payment performance
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	669		669		961
Revolving Loans Converted to Term	0		0		0
Total loans	669		669		961
Consumer | Consumer other
Current period gross write-offs
Write-offs, originated in current year			0		109
Write-offs, originated in prior year			191		8,843
Write-offs, originated two years before current year			8,351		1,149
Write-offs, originated three years before current year			680		11
Write-offs, originated four years before current year			3		78
Write-offs, originated five years before current year			130		239
Write-offs, Revolving Loans Amortized Cost Basis			0		0
Write-offs, Revolving Loans Converted to Term			0		0
Total	4,138	$ 2,578	9,355	$ 6,848	10,429
Payment performance
Loans originated in current fiscal year	25,272		25,272		49,665
Loans originated in fiscal year before current fiscal year	36,612		36,612		108,388
Loans originated two years before current fiscal year	27,361		27,361		19,726
Loans originated three years before current fiscal year	11,239		11,239		5,869
Loans originated four years before current fiscal year	4,105		4,105		7,164
Loans originated more than five years before current fiscal year	7,702		7,702		19,871
Revolving Loans Amortized Cost Basis	9,543		9,543		10,648
Revolving Loans Converted to Term	0		0		0
Total loans	121,834		121,834		221,331
Consumer | Consumer other | Performing
Payment performance
Loans originated in current fiscal year	25,272		25,272		49,588
Loans originated in fiscal year before current fiscal year	36,561		36,561		108,284
Loans originated two years before current fiscal year	27,308		27,308		19,679
Loans originated three years before current fiscal year	11,226		11,226		5,843
Loans originated four years before current fiscal year	4,105		4,105		7,054
Loans originated more than five years before current fiscal year	7,543		7,543		19,587
Revolving Loans Amortized Cost Basis	9,541		9,541		10,614
Revolving Loans Converted to Term	0		0		0
Total loans	121,556		121,556		220,649
Consumer | Consumer other | Nonperforming
Payment performance
Loans originated in current fiscal year	0		0		77
Loans originated in fiscal year before current fiscal year	51		51		104
Loans originated two years before current fiscal year	53		53		47
Loans originated three years before current fiscal year	13		13		26
Loans originated four years before current fiscal year	0		0		110
Loans originated more than five years before current fiscal year	159		159		284
Revolving Loans Amortized Cost Basis	2		2		34
Revolving Loans Converted to Term	0		0		0
Total loans	$ 278		$ 278		$ 682

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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