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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 58,735	$ 273,487
Financing receivable, year two	283,551	2,520,561
Financing receivable, year three	2,503,834	1,781,268
Financing receivable, year four	1,773,306	767,209
Financing receivable, year five	761,780	465,962
Financing receivable, prior to year five	1,359,987	924,665
Revolving	696,949	681,941
Revolving-term	6,587	7,811
Total	7,444,729	7,422,904
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,285	1,280
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,285	1,280
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	5,349	6,148
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	2,630	4,133
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	3,794	4,261
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	57,629	244,302
Financing receivable, year two	250,390	2,163,372
Financing receivable, year three	2,130,782	1,467,091
Financing receivable, year four	1,458,645	619,905
Financing receivable, year five	615,558	416,790
Financing receivable, prior to year five	1,071,677	674,608
Revolving	321,792	310,096
Revolving-term	1,166	2,160
Total	5,907,639	5,898,324
Commercial loans | Non-owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	1,499
Financing receivable, year two	1,485	70,388
Financing receivable, year three	70,344	71,217
Financing receivable, year four	71,952	41,235
Financing receivable, year five	40,897	135,816
Financing receivable, prior to year five	447,558	320,556
Revolving	1,165	1,174
Revolving-term	0	0
Total	633,401	641,885
Commercial loans | Non-owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	1,499
Financing receivable, year two	1,485	70,388
Financing receivable, year three	70,344	71,217
Financing receivable, year four	71,952	41,235
Financing receivable, year five	40,897	118,900
Financing receivable, prior to year five	396,782	286,379
Revolving	605	601
Revolving-term	0	0
Total	582,065	590,219
Commercial loans | Non-owner occupied CRE | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	686
Financing receivable, prior to year five	34,341	34,177
Revolving	0	0
Revolving-term	0	0
Total	34,341	34,863
Commercial loans | Non-owner occupied CRE | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	16,230
Financing receivable, prior to year five	16,435	0
Revolving	560	573
Revolving-term	0	0
Total	16,995	16,803
Commercial loans | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,749	108,274
Financing receivable, year two	106,521	1,813,647
Financing receivable, year three	1,810,939	1,155,619
Financing receivable, year four	1,153,636	488,595
Financing receivable, year five	486,327	191,935
Financing receivable, prior to year five	370,507	182,119
Revolving	0	0
Revolving-term	0	0
Total	3,929,679	3,940,189
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,749	108,274
Financing receivable, year two	106,521	1,813,647
Financing receivable, year three	1,810,939	1,151,677
Financing receivable, year four	1,149,694	475,708
Financing receivable, year five	473,507	189,567
Financing receivable, prior to year five	355,554	177,712
Revolving	0	0
Revolving-term	0	0
Total	3,897,964	3,916,585
Commercial loans | Multifamily | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	3,942
Financing receivable, year four	3,942	12,887
Financing receivable, year five	12,820	2,368
Financing receivable, prior to year five	8,660	1,344
Revolving	0	0
Revolving-term	0	0
Total	25,422	20,541
Commercial loans | Multifamily | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	6,293	3,063
Revolving	0	0
Revolving-term	0	0
Total	6,293	3,063
Commercial loans | Multifamily construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	(198)
Financing receivable, year two	9,013	56,013
Financing receivable, year three	64,508	112,234
Financing receivable, year four	119,609	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	193,130	168,049
Commercial loans | Multifamily construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	(198)
Financing receivable, year two	9,013	56,013
Financing receivable, year three	54,134	112,234
Financing receivable, year four	119,609	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	182,756	168,049
Commercial loans | Multifamily construction | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Multifamily construction | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	10,374	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	10,374	0
Commercial loans | CRE construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	7
Financing receivable, year two	6	0
Financing receivable, year three	0	14,685
Financing receivable, year four	14,686	3,821
Financing receivable, year five	3,824	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	18,516	18,513
Commercial loans | CRE construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	7
Financing receivable, year two	6	0
Financing receivable, year three	0	14,685
Financing receivable, year four	14,686	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	14,692	14,692
Commercial loans | CRE construction | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | CRE construction | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	3,821
Financing receivable, year five	3,824	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	3,824	3,821
Commercial loans | Single family construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	28,174	75,305
Financing receivable, year two	72,899	39,621
Financing receivable, year three	21,050	12,294
Financing receivable, year four	10,036	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	71	72
Revolving	146,445	146,758
Revolving-term	0	0
Total	278,675	274,050
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	28,174	75,305
Financing receivable, year two	72,899	39,621
Financing receivable, year three	21,050	12,294
Financing receivable, year four	10,036	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	71	72
Revolving	146,445	146,758
Revolving-term	0	0
Total	278,675	274,050
Commercial loans | Single family construction | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Single family construction | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Single family construction to permanent
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	781	27,114
Financing receivable, year two	29,592	56,469
Financing receivable, year three	40,126	19,871
Financing receivable, year four	12,223	1,850
Financing receivable, year five	2,109	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	84,831	105,304
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	781	27,114
Financing receivable, year two	29,592	56,469
Financing receivable, year three	40,126	19,871
Financing receivable, year four	12,223	1,850
Financing receivable, year five	2,109	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	84,831	105,304
Commercial loans | Single family construction to permanent | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Single family construction to permanent | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Single family construction to permanent | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,002	14,331
Financing receivable, year two	13,249	69,877
Financing receivable, year three	67,757	48,919
Financing receivable, year four	46,872	43,399
Financing receivable, year five	43,039	68,601
Financing receivable, prior to year five	209,837	145,034
Revolving	0	2
Revolving-term	187	1,122
Total	381,943	391,285
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,002	12,459
Financing receivable, year two	11,398	68,399
Financing receivable, year three	61,519	39,629
Financing receivable, year four	38,795	43,399
Financing receivable, year five	43,039	65,392
Financing receivable, prior to year five	173,406	111,199
Revolving	0	2
Revolving-term	187	1,122
Total	329,346	341,601
Commercial loans | Owner occupied CRE | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	1,871
Financing receivable, year two	1,851	1,478
Financing receivable, year three	6,238	9,290
Financing receivable, year four	8,077	0
Financing receivable, year five	0	2,956
Financing receivable, prior to year five	31,735	28,784
Revolving	0	0
Revolving-term	0	0
Total	47,901	44,379
Commercial loans | Owner occupied CRE | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	1
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	253
Financing receivable, prior to year five	4,696	5,051
Revolving	0	0
Revolving-term	0	0
Total	4,696	5,305
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	25,923	17,970
Financing receivable, year two	17,625	57,357
Financing receivable, year three	56,058	32,252
Financing receivable, year four	29,631	41,005
Financing receivable, year five	39,362	20,438
Financing receivable, prior to year five	43,704	26,827
Revolving	174,182	162,162
Revolving-term	979	1,038
Total	387,464	359,049
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	25,923	17,970
Financing receivable, year two	17,625	45,892
Financing receivable, year three	44,752	27,227
Financing receivable, year four	25,010	33,404
Financing receivable, year five	32,020	16,198
Financing receivable, prior to year five	38,288	24,903
Revolving	170,397	157,656
Revolving-term	924	973
Total	354,939	324,223
Commercial loans | Commercial business | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	11,465
Financing receivable, year three	11,033	2,891
Financing receivable, year four	3,515	0
Financing receivable, year five	0	452
Financing receivable, prior to year five	511	38
Revolving	2,762	3,485
Revolving-term	0	0
Total	17,821	18,331
Commercial loans | Commercial business | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	273	2,134
Financing receivable, year four	1,106	7,601
Financing receivable, year five	7,342	3,788
Financing receivable, prior to year five	4,905	1,886
Revolving	1,023	1,021
Revolving-term	55	65
Total	14,704	16,495
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,106	29,185
Financing receivable, year two	33,161	357,189
Financing receivable, year three	373,052	314,177
Financing receivable, year four	314,661	147,304
Financing receivable, year five	146,222	49,172
Financing receivable, prior to year five	288,310	250,057
Revolving	375,157	371,845
Revolving-term	5,421	5,651
Total	1,537,090	1,524,580
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	576	27,011
Financing receivable, year two	31,388	354,691
Financing receivable, year three	370,769	313,866
Financing receivable, year four	314,411	147,183
Financing receivable, year five	146,110	49,126
Financing receivable, prior to year five	286,686	248,402
Revolving	0	0
Revolving-term	0	0
Total	1,149,940	1,140,279
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	576	27,011
Financing receivable, year two	31,388	354,691
Financing receivable, year three	370,769	313,866
Financing receivable, year four	314,411	147,183
Financing receivable, year five	145,739	49,126
Financing receivable, prior to year five	284,386	245,574
Revolving	0	0
Revolving-term	0	0
Total	1,147,269	1,137,451
Consumer loans | Single family | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	1,298	781
Revolving	0	0
Revolving-term	0	0
Total	1,298	781
Consumer loans | Single family | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	371	0
Financing receivable, prior to year five	461	1,374
Revolving	0	0
Revolving-term	0	0
Total	832	1,374
Consumer loans | Single family | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	541	673
Revolving	0	0
Revolving-term	0	0
Total	541	673
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	530	2,174
Financing receivable, year two	1,773	2,498
Financing receivable, year three	2,283	311
Financing receivable, year four	250	121
Financing receivable, year five	112	46
Financing receivable, prior to year five	1,624	1,655
Revolving	375,157	371,845
Revolving-term	5,421	5,651
Total	387,150	384,301
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	530	2,165
Financing receivable, year two	1,763	2,493
Financing receivable, year three	2,279	311
Financing receivable, year four	248	121
Financing receivable, year five	112	46
Financing receivable, prior to year five	1,600	1,631
Revolving	373,327	370,462
Revolving-term	5,296	5,483
Total	385,155	382,712
Consumer loans | Home equity and other | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	8
Financing receivable, year two	2	2
Financing receivable, year three	0	0
Financing receivable, year four	2	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	646	802
Revolving-term	80	162
Total	730	974
Consumer loans | Home equity and other | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	1
Financing receivable, year two	0	3
Financing receivable, year three	2	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	68	419
Revolving-term	0	0
Total	70	423
Consumer loans | Home equity and other | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	8	0
Financing receivable, year three	2	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	24	24
Revolving	1,116	162
Revolving-term	45	6
Total	$ 1,195	$ 192

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Financing Receivable, Excluding Accrued Interest, Revolving, Term

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 5
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-Publisher FASB
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Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

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