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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 140,246	$ 273,487
Financing receivable, year two	257,293	2,520,561
Financing receivable, year three	2,471,182	1,781,268
Financing receivable, year four	1,736,325	767,209
Financing receivable, year five	735,455	465,962
Financing receivable, prior to year five	1,272,065	924,665
Revolving	715,040	681,941
Revolving-term	5,648	7,811
Total	7,333,254	7,422,904
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,329	1,280
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,329	1,280
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	3,719	6,148
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,867	4,133
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	4,967	4,261
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	138,936	244,302
Financing receivable, year two	218,639	2,163,372
Financing receivable, year three	2,087,186	1,467,091
Financing receivable, year four	1,427,473	619,905
Financing receivable, year five	594,036	416,790
Financing receivable, prior to year five	1,002,491	674,608
Revolving	318,919	310,096
Revolving-term	955	2,160
Total	5,788,635	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	1,456	70,388
Financing receivable, year three	70,175	71,217
Financing receivable, year four	71,686	41,235
Financing receivable, year five	40,226	135,816
Financing receivable, prior to year five	406,803	320,556
Revolving	610	1,174
Revolving-term	0	0
Total	590,956	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	1,456	70,388
Financing receivable, year three	70,175	71,217
Financing receivable, year four	71,686	41,235
Financing receivable, year five	40,226	118,900
Financing receivable, prior to year five	365,039	286,379
Revolving	610	601
Revolving-term	0	0
Total	549,192	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	25,534	34,177
Revolving	0	0
Revolving-term	0	0
Total	25,534	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	16,230	0
Revolving	0	573
Revolving-term	0	0
Total	16,230	16,803
Commercial loans | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,722	108,274
Financing receivable, year two	106,452	1,813,647
Financing receivable, year three	1,804,273	1,155,619
Financing receivable, year four	1,210,918	488,595
Financing receivable, year five	470,538	191,935
Financing receivable, prior to year five	357,038	182,119
Revolving	0	0
Revolving-term	0	0
Total	3,950,941	3,940,189
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,722	108,274
Financing receivable, year two	106,452	1,813,647
Financing receivable, year three	1,730,141	1,151,677
Financing receivable, year four	1,207,002	475,708
Financing receivable, year five	430,732	189,567
Financing receivable, prior to year five	303,043	177,712
Revolving	0	0
Revolving-term	0	0
Total	3,779,092	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	74,132	3,942
Financing receivable, year four	3,916	12,887
Financing receivable, year five	39,806	2,368
Financing receivable, prior to year five	47,758	1,344
Revolving	0	0
Revolving-term	0	0
Total	165,612	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	6,237	3,063
Revolving	0	0
Revolving-term	0	0
Total	6,237	3,063
Commercial loans | Multifamily construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	(198)
Financing receivable, year two	28,529	56,013
Financing receivable, year three	65,652	112,234
Financing receivable, year four	63,231	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	157,412	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	28,529	56,013
Financing receivable, year three	65,652	112,234
Financing receivable, year four	63,231	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	157,412	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	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
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	7
Financing receivable, year two	5,810	0
Financing receivable, year three	0	14,685
Financing receivable, year four	0	3,821
Financing receivable, year five	3,821	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	9,631	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	5,810	0
Financing receivable, year three	0	14,685
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	5,810	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	3,821	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	3,821	3,821
Commercial loans | Single family construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	103,729	75,305
Financing receivable, year two	27,734	39,621
Financing receivable, year three	10,095	12,294
Financing receivable, year four	7,035	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	69	72
Revolving	165,673	146,758
Revolving-term	0	0
Total	314,335	274,050
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	103,729	75,305
Financing receivable, year two	27,734	39,621
Financing receivable, year three	10,095	12,294
Financing receivable, year four	7,035	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	69	72
Revolving	165,673	146,758
Revolving-term	0	0
Total	314,335	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	5,093	27,114
Financing receivable, year two	19,913	56,469
Financing receivable, year three	20,843	19,871
Financing receivable, year four	7,952	1,850
Financing receivable, year five	422	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	54,223	105,304
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	5,093	27,114
Financing receivable, year two	19,913	56,469
Financing receivable, year three	20,843	19,871
Financing receivable, year four	7,952	1,850
Financing receivable, year five	422	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	54,223	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	1,415	14,331
Financing receivable, year two	12,430	69,877
Financing receivable, year three	66,464	48,919
Financing receivable, year four	42,211	43,399
Financing receivable, year five	42,208	68,601
Financing receivable, prior to year five	200,320	145,034
Revolving	4	2
Revolving-term	86	1,122
Total	365,138	391,285
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,415	12,459
Financing receivable, year two	10,620	68,399
Financing receivable, year three	59,954	39,629
Financing receivable, year four	34,535	43,399
Financing receivable, year five	42,208	65,392
Financing receivable, prior to year five	171,189	111,199
Revolving	4	2
Revolving-term	86	1,122
Total	320,011	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	1,810	1,478
Financing receivable, year three	6,166	9,290
Financing receivable, year four	7,676	0
Financing receivable, year five	0	2,956
Financing receivable, prior to year five	26,750	28,784
Revolving	0	0
Revolving-term	0	0
Total	42,402	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	344	0
Financing receivable, year four	0	0
Financing receivable, year five	0	253
Financing receivable, prior to year five	2,381	5,051
Revolving	0	0
Revolving-term	0	0
Total	2,725	5,305
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	26,977	17,970
Financing receivable, year two	16,315	57,357
Financing receivable, year three	49,684	32,252
Financing receivable, year four	24,440	41,005
Financing receivable, year five	36,821	20,438
Financing receivable, prior to year five	38,261	26,827
Revolving	152,632	162,162
Revolving-term	869	1,038
Total	345,999	359,049
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	26,722	17,970
Financing receivable, year two	15,893	45,892
Financing receivable, year three	38,551	27,227
Financing receivable, year four	22,573	33,404
Financing receivable, year five	29,617	16,198
Financing receivable, prior to year five	32,943	24,903
Revolving	149,728	157,656
Revolving-term	835	973
Total	316,862	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	0	2,891
Financing receivable, year four	1,867	0
Financing receivable, year five	689	452
Financing receivable, prior to year five	685	38
Revolving	2	3,485
Revolving-term	0	0
Total	3,243	18,331
Commercial loans | Commercial business | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	255	0
Financing receivable, year two	422	0
Financing receivable, year three	11,133	2,134
Financing receivable, year four	0	7,601
Financing receivable, year five	6,515	3,788
Financing receivable, prior to year five	4,633	1,886
Revolving	2,902	1,021
Revolving-term	34	65
Total	25,894	16,495
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,310	29,185
Financing receivable, year two	38,654	357,189
Financing receivable, year three	383,996	314,177
Financing receivable, year four	308,852	147,304
Financing receivable, year five	141,419	49,172
Financing receivable, prior to year five	269,574	250,057
Revolving	396,121	371,845
Revolving-term	4,693	5,651
Total	1,544,619	1,524,580
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	254	27,011
Financing receivable, year two	37,460	354,691
Financing receivable, year three	382,171	313,866
Financing receivable, year four	308,697	147,183
Financing receivable, year five	141,332	49,126
Financing receivable, prior to year five	268,067	248,402
Revolving	0	0
Revolving-term	0	0
Total	1,137,981	1,140,279
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	254	27,011
Financing receivable, year two	37,460	354,691
Financing receivable, year three	382,171	313,866
Financing receivable, year four	308,697	147,183
Financing receivable, year five	141,332	49,126
Financing receivable, prior to year five	264,815	245,574
Revolving	0	0
Revolving-term	0	0
Total	1,134,729	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	713	781
Revolving	0	0
Revolving-term	0	0
Total	713	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	0	0
Financing receivable, prior to year five	235	1,374
Revolving	0	0
Revolving-term	0	0
Total	235	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	2,304	673
Revolving	0	0
Revolving-term	0	0
Total	2,304	673
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,056	2,174
Financing receivable, year two	1,194	2,498
Financing receivable, year three	1,825	311
Financing receivable, year four	155	121
Financing receivable, year five	87	46
Financing receivable, prior to year five	1,507	1,655
Revolving	396,121	371,845
Revolving-term	4,693	5,651
Total	406,638	384,301
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,056	2,165
Financing receivable, year two	1,190	2,493
Financing receivable, year three	1,809	311
Financing receivable, year four	150	121
Financing receivable, year five	87	46
Financing receivable, prior to year five	1,484	1,631
Revolving	393,460	370,462
Revolving-term	4,532	5,483
Total	403,768	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	4	2
Financing receivable, year three	4	0
Financing receivable, year four	4	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	1,467	802
Revolving-term	28	162
Total	1,507	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	5	0
Financing receivable, year four	1	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	193	419
Revolving-term	6	0
Total	205	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	0	0
Financing receivable, year three	7	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	23	24
Revolving	1,001	162
Revolving-term	127	6
Total	$ 1,158	$ 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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-Topic 326
-SubTopic 20
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-Section 45
-Paragraph 1
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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
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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