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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 70,748	$ 2,544,193
Financing receivable, year two	2,569,484	1,797,256
Financing receivable, year three	1,782,682	875,008
Financing receivable, year four	850,295	533,369
Financing receivable, year five	527,824	255,162
Financing receivable, prior to year five	1,052,233	814,005
Revolving	622,551	599,278
Revolving-term	10,565	8,049
Total	7,486,382	7,426,320
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	5,231	5,868
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	5,231	5,868
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	4,844	4,823
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,899	2,020
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	11,259	4,372
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	62,897	2,266,245
Financing receivable, year two	2,282,679	1,542,597
Financing receivable, year three	1,498,745	722,015
Financing receivable, year four	693,668	483,627
Financing receivable, year five	478,230	210,966
Financing receivable, prior to year five	772,431	577,415
Revolving	274,721	257,715
Revolving-term	3,110	4,032
Total	6,066,481	6,064,612
Commercial loans | Non-owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,542	68,301
Financing receivable, year two	68,246	68,356
Financing receivable, year three	68,280	42,181
Financing receivable, year four	41,870	139,760
Financing receivable, year five	139,021	89,899
Financing receivable, prior to year five	332,203	246,786
Revolving	1,122	2,016
Revolving-term	0	786
Total	652,284	658,085
Commercial loans | Non-owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,542	68,301
Financing receivable, year two	68,246	68,356
Financing receivable, year three	68,280	42,181
Financing receivable, year four	41,870	139,760
Financing receivable, year five	138,583	87,197
Financing receivable, prior to year five	302,871	242,544
Revolving	1,122	2,016
Revolving-term	0	786
Total	622,514	651,141
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	2,702
Financing receivable, prior to year five	29,332	4,242
Revolving	0	0
Revolving-term	0	0
Total	29,332	6,944
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	438	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	438	0
Commercial loans | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	15,923	1,828,568
Financing receivable, year two	1,826,992	1,165,434
Financing receivable, year three	1,159,589	532,970
Financing receivable, year four	527,389	241,808
Financing receivable, year five	240,814	59,340
Financing receivable, prior to year five	204,947	147,634
Revolving	0	0
Revolving-term	0	0
Total	3,975,654	3,975,754
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	15,923	1,828,568
Financing receivable, year two	1,826,992	1,165,434
Financing receivable, year three	1,159,589	528,077
Financing receivable, year four	522,497	221,974
Financing receivable, year five	238,448	59,340
Financing receivable, prior to year five	197,486	140,126
Revolving	0	0
Revolving-term	0	0
Total	3,960,935	3,943,519
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	4,893
Financing receivable, year four	4,892	19,834
Financing receivable, year five	2,366	0
Financing receivable, prior to year five	7,461	7,508
Revolving	0	0
Revolving-term	0	0
Total	14,719	32,235
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	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Multifamily construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	(222)	18,110
Financing receivable, year two	23,795	63,394
Financing receivable, year three	71,396	13,613
Financing receivable, year four	14,164	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	109,133	95,117
Commercial loans | Multifamily construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	(222)	18,110
Financing receivable, year two	23,795	63,394
Financing receivable, year three	71,396	13,613
Financing receivable, year four	14,164	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	109,133	95,117
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	341
Financing receivable, year two	1,713	14,348
Financing receivable, year three	14,416	3,960
Financing receivable, year four	3,958	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total	20,087	18,954
Commercial loans | CRE construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	341
Financing receivable, year two	1,713	14,348
Financing receivable, year three	14,416	3,960
Financing receivable, year four	3,958	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total	20,087	18,954
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	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
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	22,174	149,133
Financing receivable, year two	140,812	57,718
Financing receivable, year three	36,106	24,807
Financing receivable, year four	10,748	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	74	74
Revolving	117,718	123,303
Revolving-term	0	0
Total	327,632	355,554
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	22,174	149,133
Financing receivable, year two	140,812	50,936
Financing receivable, year three	30,374	24,807
Financing receivable, year four	10,748	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	74	74
Revolving	117,718	123,303
Revolving-term	0	0
Total	321,900	348,772
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	6,782
Financing receivable, year three	5,732	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	5,732	6,782
Commercial loans | Single family construction to permanent
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	3,874	66,034
Financing receivable, year two	84,818	76,814
Financing receivable, year three	54,059	11,128
Financing receivable, year four	5,253	3,268
Financing receivable, year five	2,186	794
Financing receivable, prior to year five	517	0
Revolving	0	0
Revolving-term	0	0
Total	150,707	158,038
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	3,874	66,034
Financing receivable, year two	84,818	76,814
Financing receivable, year three	54,059	11,128
Financing receivable, year four	5,253	3,268
Financing receivable, year five	2,186	794
Financing receivable, prior to year five	517	0
Revolving	0	0
Revolving-term	0	0
Total	150,707	158,038
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	3,908	70,192
Financing receivable, year two	71,215	52,662
Financing receivable, year three	51,915	44,778
Financing receivable, year four	42,620	71,652
Financing receivable, year five	70,651	44,785
Financing receivable, prior to year five	196,751	158,187
Revolving	2	3
Revolving-term	1,085	1,104
Total	438,147	443,363
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	3,908	70,192
Financing receivable, year two	69,709	51,919
Financing receivable, year three	51,178	44,778
Financing receivable, year four	42,620	71,652
Financing receivable, year five	70,651	36,457
Financing receivable, prior to year five	176,851	139,691
Revolving	2	3
Revolving-term	1,085	1,104
Total	416,004	415,796
Commercial loans | Owner occupied CRE | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	1,506	743
Financing receivable, year three	737	0
Financing receivable, year four	0	0
Financing receivable, year five	0	6,179
Financing receivable, prior to year five	12,915	13,485
Revolving	0	0
Revolving-term	0	0
Total	15,158	20,407
Commercial loans | 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	2,149
Financing receivable, prior to year five	6,985	5,011
Revolving	0	0
Revolving-term	0	0
Total	6,985	7,160
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	15,698	65,566
Financing receivable, year two	65,088	43,871
Financing receivable, year three	42,984	48,578
Financing receivable, year four	47,666	26,620
Financing receivable, year five	25,558	16,148
Financing receivable, prior to year five	37,939	24,429
Revolving	155,879	132,393
Revolving-term	2,025	2,142
Total	392,837	359,747
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	15,698	65,566
Financing receivable, year two	53,476	42,921
Financing receivable, year three	38,338	45,940
Financing receivable, year four	45,115	18,594
Financing receivable, year five	17,838	13,548
Financing receivable, prior to year five	30,257	18,779
Revolving	152,482	130,427
Revolving-term	1,743	2,041
Total	354,947	337,816
Commercial loans | Commercial business | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	11,612	612
Financing receivable, year three	3,650	0
Financing receivable, year four	0	3,577
Financing receivable, year five	3,765	9
Financing receivable, prior to year five	3,093	3,444
Revolving	1,935	403
Revolving-term	190	0
Total	24,245	8,045
Commercial loans | Commercial business | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	338
Financing receivable, year three	996	2,638
Financing receivable, year four	2,551	4,449
Financing receivable, year five	3,955	2,591
Financing receivable, prior to year five	4,589	2,206
Revolving	1,462	1,563
Revolving-term	92	101
Total	13,645	13,886
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	7,851	277,948
Financing receivable, year two	286,805	254,659
Financing receivable, year three	283,937	152,993
Financing receivable, year four	156,627	49,742
Financing receivable, year five	49,594	44,196
Financing receivable, prior to year five	279,802	236,590
Revolving	347,830	341,563
Revolving-term	7,455	4,017
Total	1,419,901	1,361,708
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	7,309	273,786
Financing receivable, year two	283,042	253,937
Financing receivable, year three	283,329	152,773
Financing receivable, year four	156,430	49,592
Financing receivable, year five	49,480	44,124
Financing receivable, prior to year five	277,989	234,789
Revolving	0	0
Revolving-term	0	0
Total	1,057,579	1,009,001
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	7,309	273,786
Financing receivable, year two	283,042	253,937
Financing receivable, year three	283,329	152,773
Financing receivable, year four	156,430	49,302
Financing receivable, year five	48,645	43,511
Financing receivable, prior to year five	272,582	231,277
Revolving	0	0
Revolving-term	0	0
Total	1,051,337	1,004,586
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	545	340
Financing receivable, prior to year five	2,020	2,113
Revolving	0	0
Revolving-term	0	0
Total	2,565	2,453
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	539	258
Revolving	0	0
Revolving-term	0	0
Total	539	258
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	290
Financing receivable, year five	290	273
Financing receivable, prior to year five	2,848	1,141
Revolving	0	0
Revolving-term	0	0
Total	3,138	1,704
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	542	4,162
Financing receivable, year two	3,763	722
Financing receivable, year three	608	220
Financing receivable, year four	197	150
Financing receivable, year five	114	72
Financing receivable, prior to year five	1,813	1,801
Revolving	347,830	341,563
Revolving-term	7,455	4,017
Total	362,322	352,707
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	542	4,156
Financing receivable, year two	3,693	692
Financing receivable, year three	601	220
Financing receivable, year four	197	150
Financing receivable, year five	114	72
Financing receivable, prior to year five	1,788	1,593
Revolving	346,770	340,567
Revolving-term	7,379	4,017
Total	361,084	351,467
Consumer loans | Home equity and other | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	10	6
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	9
Revolving	620	446
Revolving-term	58	0
Total	688	461
Consumer loans | Home equity and other | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	6
Financing receivable, year two	28	24
Financing receivable, year three	7	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	48
Revolving	53	517
Revolving-term	8	0
Total	96	595
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	32	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	25	151
Revolving	387	33
Revolving-term	10	0
Total	$ 454	$ 184

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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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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-Publisher FASB
-Name Accounting Standards Codification
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