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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 2,198,789	$ 1,983,151
Financing receivable, year two	1,915,796	976,561
Financing receivable, year three	881,782	685,228
Financing receivable, year four	539,467	343,695
Financing receivable, year five	263,226	324,120
Financing receivable, prior to year five	836,520	704,248
Revolving	569,768	514,380
Revolving-term	8,139	11,466
Total	7,213,487	5,542,849
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	5,850	7,287
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	5,850	7,287
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	3,139	1,208
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	867	894
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	5,064	6,717
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,997,245	1,805,033
Financing receivable, year two	1,694,398	819,724
Financing receivable, year three	734,196	621,614
Financing receivable, year four	490,454	276,648
Financing receivable, year five	215,408	227,302
Financing receivable, prior to year five	591,115	496,716
Revolving	247,400	223,272
Revolving-term	3,965	6,131
Total	5,974,181	4,476,440
Commercial loans | Non-owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	68,355	68,647
Financing receivable, year two	68,432	50,571
Financing receivable, year three	42,525	169,711
Financing receivable, year four	140,499	130,877
Financing receivable, year five	92,645	100,674
Financing receivable, prior to year five	250,995	183,024
Revolving	2,141	963
Revolving-term	802	892
Total	666,394	705,359
Commercial loans | Non-owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	68,355	68,647
Financing receivable, year two	68,432	50,571
Financing receivable, year three	42,525	169,711
Financing receivable, year four	140,499	130,877
Financing receivable, year five	92,645	100,674
Financing receivable, prior to year five	246,729	183,024
Revolving	2,141	963
Revolving-term	802	892
Total	662,128	705,359
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	0
Financing receivable, prior to year five	4,266	0
Revolving	0	0
Revolving-term	0	0
Total	4,266	0
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	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,642,429	1,315,204
Financing receivable, year two	1,292,784	561,666
Financing receivable, year three	536,731	286,826
Financing receivable, year four	242,459	60,372
Financing receivable, year five	59,604	26,065
Financing receivable, prior to year five	149,619	165,225
Revolving	320	1
Revolving-term	0	0
Total	3,923,946	2,415,359
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,642,429	1,315,204
Financing receivable, year two	1,292,784	561,666
Financing receivable, year three	531,838	286,826
Financing receivable, year four	222,624	60,372
Financing receivable, year five	59,604	26,065
Financing receivable, prior to year five	142,064	165,225
Revolving	320	1
Revolving-term	0	0
Total	3,891,663	2,415,359
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	4,893	0
Financing receivable, year four	19,835	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	7,555	0
Revolving	0	0
Revolving-term	0	0
Total	32,283	0
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	9,078	7,825
Financing receivable, year two	40,846	22,863
Financing receivable, year three	12,793	7,173
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	62,717	37,861
Commercial loans | Multifamily construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	9,078	7,825
Financing receivable, year two	40,846	22,863
Financing receivable, year three	12,793	7,173
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	62,717	37,861
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	7,694
Financing receivable, year two	14,314	3,960
Financing receivable, year three	3,959	0
Financing receivable, year four	0	1,962
Financing receivable, year five	0	0
Financing receivable, prior to year five	311	556
Revolving	0	0
Revolving-term	0	0
Total	18,584	14,172
Commercial loans | CRE construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	7,694
Financing receivable, year two	14,314	3,960
Financing receivable, year three	3,959	0
Financing receivable, year four	0	1,962
Financing receivable, year five	0	0
Financing receivable, prior to year five	311	556
Revolving	0	0
Revolving-term	0	0
Total	18,584	14,172
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	130,517	146,595
Financing receivable, year two	72,095	35,640
Financing receivable, year three	24,369	14,509
Financing receivable, year four	2,129	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	75	77
Revolving	116,346	99,206
Revolving-term	0	0
Total	345,531	296,027
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	130,517	146,595
Financing receivable, year two	72,095	35,640
Financing receivable, year three	24,369	14,509
Financing receivable, year four	2,129	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	75	77
Revolving	116,346	99,206
Revolving-term	0	0
Total	345,531	296,027
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	40,499	90,311
Financing receivable, year two	99,023	42,636
Financing receivable, year three	17,758	13,362
Financing receivable, year four	5,186	1,775
Financing receivable, year five	794	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	163,260	148,084
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	40,499	90,311
Financing receivable, year two	99,023	42,636
Financing receivable, year three	17,758	13,362
Financing receivable, year four	5,186	1,775
Financing receivable, year five	794	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	163,260	148,084
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	49,583	70,902
Financing receivable, year two	53,256	47,536
Financing receivable, year three	45,926	76,088
Financing receivable, year four	72,717	51,023
Financing receivable, year five	45,455	83,212
Financing receivable, prior to year five	164,054	125,248
Revolving	0	798
Revolving-term	1,123	2,899
Total	432,114	457,706
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	49,583	70,902
Financing receivable, year two	53,256	47,536
Financing receivable, year three	45,926	57,423
Financing receivable, year four	72,717	47,716
Financing receivable, year five	41,147	67,042
Financing receivable, prior to year five	147,619	106,659
Revolving	0	798
Revolving-term	1,123	2,839
Total	411,371	400,915
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	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	2,196
Financing receivable, year five	2,149	6,019
Financing receivable, prior to year five	13,944	145
Revolving	0	0
Revolving-term	0	60
Total	16,093	8,420
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	18,665
Financing receivable, year four	0	1,111
Financing receivable, year five	2,159	10,151
Financing receivable, prior to year five	2,491	18,444
Revolving	0	0
Revolving-term	0	0
Total	4,650	48,371
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	56,784	97,855
Financing receivable, year two	53,648	54,852
Financing receivable, year three	50,135	53,945
Financing receivable, year four	27,464	30,639
Financing receivable, year five	16,910	17,351
Financing receivable, prior to year five	26,061	22,586
Revolving	128,593	122,304
Revolving-term	2,040	2,340
Total	361,635	401,872
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	56,784	88,139
Financing receivable, year two	46,473	51,453
Financing receivable, year three	47,357	44,882
Financing receivable, year four	22,740	24,711
Financing receivable, year five	14,232	11,859
Financing receivable, prior to year five	20,234	21,258
Revolving	123,215	112,759
Revolving-term	1,931	2,104
Total	332,966	357,165
Commercial loans | Commercial business | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	189	0
Financing receivable, year three	0	7,396
Financing receivable, year four	0	0
Financing receivable, year five	193	4,396
Financing receivable, prior to year five	3,796	0
Revolving	753	5,613
Revolving-term	109	134
Total	5,040	17,539
Commercial loans | Commercial business | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	9,716
Financing receivable, year two	6,986	3,399
Financing receivable, year three	2,778	1,667
Financing receivable, year four	4,724	5,928
Financing receivable, year five	2,485	1,096
Financing receivable, prior to year five	2,031	1,328
Revolving	4,625	3,932
Revolving-term	0	102
Total	23,629	27,168
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	201,544	178,118
Financing receivable, year two	221,398	156,837
Financing receivable, year three	147,586	63,614
Financing receivable, year four	49,013	67,047
Financing receivable, year five	47,818	96,818
Financing receivable, prior to year five	245,405	207,532
Revolving	322,368	291,108
Revolving-term	4,174	5,335
Total	1,239,306	1,066,409
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	199,172	176,110
Financing receivable, year two	220,456	156,360
Financing receivable, year three	147,398	63,221
Financing receivable, year four	48,822	66,515
Financing receivable, year five	47,679	96,302
Financing receivable, prior to year five	243,517	204,823
Revolving	0	0
Revolving-term	0	0
Total	907,044	763,331
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	199,172	176,110
Financing receivable, year two	220,456	156,360
Financing receivable, year three	147,398	62,369
Financing receivable, year four	48,390	66,063
Financing receivable, year five	47,679	95,988
Financing receivable, prior to year five	241,953	204,229
Revolving	0	0
Revolving-term	0	0
Total	905,048	761,119
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	291
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	93	0
Revolving	0	0
Revolving-term	0	0
Total	93	291
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	314
Financing receivable, prior to year five	0	471
Revolving	0	0
Revolving-term	0	0
Total	0	785
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	561
Financing receivable, year four	432	452
Financing receivable, year five	0	0
Financing receivable, prior to year five	1,471	123
Revolving	0	0
Revolving-term	0	0
Total	1,903	1,136
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	2,372	2,008
Financing receivable, year two	942	477
Financing receivable, year three	188	393
Financing receivable, year four	191	532
Financing receivable, year five	139	516
Financing receivable, prior to year five	1,888	2,709
Revolving	322,368	291,108
Revolving-term	4,174	5,335
Total	332,262	303,078
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	2,347	2,005
Financing receivable, year two	912	474
Financing receivable, year three	188	393
Financing receivable, year four	191	532
Financing receivable, year five	139	516
Financing receivable, prior to year five	1,622	2,609
Revolving	322,132	290,512
Revolving-term	4,172	5,273
Total	331,703	302,314
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	30	3
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	52	94
Revolving	232	40
Revolving-term	2	0
Total	316	137
Consumer loans | Home equity and other | 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	4	12
Revolving-term	0	62
Total	4	74
Consumer loans | Home equity and other | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	25	3
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	214	6
Revolving	0	544
Revolving-term	0	0
Total	$ 239	$ 553

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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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-Publisher FASB
-Name Accounting Standards Codification
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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
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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