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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 163,537	$ 2,544,193
Financing receivable, year two	2,544,019	1,797,256
Financing receivable, year three	1,782,826	875,008
Financing receivable, year four	805,099	533,369
Financing receivable, year five	501,425	255,162
Financing receivable, prior to year five	1,014,949	814,005
Revolving	615,553	599,278
Revolving-term	9,243	8,049
Total	7,436,651	7,426,320
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,269	5,868
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,269	5,868
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	3,908	4,823
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,257	2,020
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	4,715	4,372
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	146,364	2,266,245
Financing receivable, year two	2,245,501	1,542,597
Financing receivable, year three	1,490,163	722,015
Financing receivable, year four	653,788	483,627
Financing receivable, year five	453,027	210,966
Financing receivable, prior to year five	748,046	577,415
Revolving	260,745	257,715
Revolving-term	2,581	4,032
Total	6,000,215	6,064,612
Commercial loans | Non-owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,528	68,301
Financing receivable, year two	68,192	68,356
Financing receivable, year three	68,206	42,181
Financing receivable, year four	41,558	139,760
Financing receivable, year five	137,517	89,899
Financing receivable, prior to year five	332,535	246,786
Revolving	1,174	2,016
Revolving-term	0	786
Total	650,710	658,085
Commercial loans | Non-owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,528	68,301
Financing receivable, year two	68,192	68,356
Financing receivable, year three	68,206	42,181
Financing receivable, year four	41,558	139,760
Financing receivable, year five	120,283	87,197
Financing receivable, prior to year five	303,392	242,544
Revolving	1,174	2,016
Revolving-term	0	786
Total	604,333	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	29,143	4,242
Revolving	0	0
Revolving-term	0	0
Total	29,143	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	17,234	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	17,234	0
Commercial loans | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	65,433	1,828,568
Financing receivable, year two	1,817,799	1,165,434
Financing receivable, year three	1,158,857	532,970
Financing receivable, year four	510,951	241,808
Financing receivable, year five	221,116	59,340
Financing receivable, prior to year five	192,738	147,634
Revolving	0	0
Revolving-term	0	0
Total	3,966,894	3,975,754
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	65,433	1,828,568
Financing receivable, year two	1,817,799	1,165,434
Financing receivable, year three	1,158,857	528,077
Financing receivable, year four	506,073	221,974
Financing receivable, year five	218,747	59,340
Financing receivable, prior to year five	185,323	140,126
Revolving	0	0
Revolving-term	0	0
Total	3,952,232	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	4,878	19,834
Financing receivable, year five	2,369	0
Financing receivable, prior to year five	7,415	7,508
Revolving	0	0
Revolving-term	0	0
Total	14,662	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	(215)	18,110
Financing receivable, year two	33,089	63,394
Financing receivable, year three	88,765	13,613
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	121,639	95,117
Commercial loans | Multifamily construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	(215)	18,110
Financing receivable, year two	33,089	63,394
Financing receivable, year three	88,765	13,613
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	121,639	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	1,792	14,348
Financing receivable, year three	14,457	3,960
Financing receivable, year four	3,960	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total	20,209	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	0	14,348
Financing receivable, year three	14,457	3,960
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total	14,457	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	1,792	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	1,792	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	3,960	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	3,960	0
Commercial loans | Single family construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	40,862	149,133
Financing receivable, year two	92,812	57,718
Financing receivable, year three	23,293	24,807
Financing receivable, year four	3,881	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	73	74
Revolving	114,387	123,303
Revolving-term	0	0
Total	275,308	355,554
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	40,862	149,133
Financing receivable, year two	92,812	50,936
Financing receivable, year three	20,620	24,807
Financing receivable, year four	3,881	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	73	74
Revolving	114,387	123,303
Revolving-term	0	0
Total	272,635	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	2,673	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	2,673	6,782
Commercial loans | Single family construction to permanent
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	11,748	66,034
Financing receivable, year two	97,491	76,814
Financing receivable, year three	43,564	11,128
Financing receivable, year four	4,405	3,268
Financing receivable, year five	1,551	794
Financing receivable, prior to year five	517	0
Revolving	0	0
Revolving-term	0	0
Total	159,276	158,038
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	11,748	66,034
Financing receivable, year two	97,491	76,814
Financing receivable, year three	43,564	11,128
Financing receivable, year four	4,405	3,268
Financing receivable, year five	1,551	794
Financing receivable, prior to year five	517	0
Revolving	0	0
Revolving-term	0	0
Total	159,276	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	10,516	70,192
Financing receivable, year two	72,410	52,662
Financing receivable, year three	51,330	44,778
Financing receivable, year four	42,269	71,652
Financing receivable, year five	69,286	44,785
Financing receivable, prior to year five	187,663	158,187
Revolving	3	3
Revolving-term	923	1,104
Total	434,400	443,363
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	10,516	70,192
Financing receivable, year two	70,913	51,919
Financing receivable, year three	42,565	44,778
Financing receivable, year four	42,269	71,652
Financing receivable, year five	69,286	36,457
Financing receivable, prior to year five	168,623	139,691
Revolving	3	3
Revolving-term	923	1,104
Total	405,098	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	1,497	743
Financing receivable, year three	8,765	0
Financing receivable, year four	0	0
Financing receivable, year five	0	6,179
Financing receivable, prior to year five	12,572	13,485
Revolving	0	0
Revolving-term	0	0
Total	22,834	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	6,468	5,011
Revolving	0	0
Revolving-term	0	0
Total	6,468	7,160
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	16,492	65,566
Financing receivable, year two	61,916	43,871
Financing receivable, year three	41,691	48,578
Financing receivable, year four	46,764	26,620
Financing receivable, year five	23,557	16,148
Financing receivable, prior to year five	34,520	24,429
Revolving	145,181	132,393
Revolving-term	1,658	2,142
Total	371,779	359,747
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	16,492	65,566
Financing receivable, year two	50,456	42,921
Financing receivable, year three	34,782	45,940
Financing receivable, year four	39,632	18,594
Financing receivable, year five	16,065	13,548
Financing receivable, prior to year five	27,333	18,779
Revolving	140,606	130,427
Revolving-term	1,399	2,041
Total	326,765	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	11,460	612
Financing receivable, year three	3,949	0
Financing receivable, year four	0	3,577
Financing receivable, year five	3,668	9
Financing receivable, prior to year five	2,169	3,444
Revolving	4,414	403
Revolving-term	176	0
Total	25,836	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	2,960	2,638
Financing receivable, year four	7,132	4,449
Financing receivable, year five	3,824	2,591
Financing receivable, prior to year five	5,018	2,206
Revolving	161	1,563
Revolving-term	83	101
Total	19,178	13,886
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	17,173	277,948
Financing receivable, year two	298,518	254,659
Financing receivable, year three	292,663	152,993
Financing receivable, year four	151,311	49,742
Financing receivable, year five	48,398	44,196
Financing receivable, prior to year five	266,903	236,590
Revolving	354,808	341,563
Revolving-term	6,662	4,017
Total	1,436,436	1,361,708
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	16,215	273,786
Financing receivable, year two	295,209	253,937
Financing receivable, year three	292,170	152,773
Financing receivable, year four	151,153	49,592
Financing receivable, year five	48,318	44,124
Financing receivable, prior to year five	265,164	234,789
Revolving	0	0
Revolving-term	0	0
Total	1,068,229	1,009,001
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	16,215	273,786
Financing receivable, year two	295,209	253,937
Financing receivable, year three	292,170	152,773
Financing receivable, year four	151,153	49,302
Financing receivable, year five	47,776	43,511
Financing receivable, prior to year five	261,108	231,277
Revolving	0	0
Revolving-term	0	0
Total	1,063,631	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	542	340
Financing receivable, prior to year five	1,374	2,113
Revolving	0	0
Revolving-term	0	0
Total	1,916	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	0	258
Revolving	0	0
Revolving-term	0	0
Total	0	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	0	273
Financing receivable, prior to year five	2,682	1,141
Revolving	0	0
Revolving-term	0	0
Total	2,682	1,704
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	958	4,162
Financing receivable, year two	3,309	722
Financing receivable, year three	493	220
Financing receivable, year four	158	150
Financing receivable, year five	80	72
Financing receivable, prior to year five	1,739	1,801
Revolving	354,808	341,563
Revolving-term	6,662	4,017
Total	368,207	352,707
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	958	4,156
Financing receivable, year two	3,297	692
Financing receivable, year three	486	220
Financing receivable, year four	158	150
Financing receivable, year five	80	72
Financing receivable, prior to year five	1,710	1,593
Revolving	353,521	340,567
Revolving-term	6,629	4,017
Total	366,839	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	3	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	4	9
Revolving	695	446
Revolving-term	26	0
Total	728	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	0	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	6	517
Revolving-term	0	0
Total	13	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	9	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	586	33
Revolving-term	7	0
Total	$ 627	$ 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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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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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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-Section 50
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-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
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

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