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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 524,516	$ 1,983,151
Financing receivable, year two	1,970,511	976,561
Financing receivable, year three	944,211	685,228
Financing receivable, year four	607,468	343,695
Financing receivable, year five	320,530	324,120
Financing receivable, prior to year five	967,847	704,248
Revolving	519,620	514,380
Revolving-term	9,787	11,466
Total	5,864,490	5,542,849
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	6,981	7,287
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	6,981	7,287
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	3,814	1,208
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,852	894
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	6,903	6,717
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	479,156	1,805,033
Financing receivable, year two	1,790,259	819,724
Financing receivable, year three	791,434	621,614
Financing receivable, year four	557,066	276,648
Financing receivable, year five	263,109	227,302
Financing receivable, prior to year five	689,035	496,716
Revolving	234,451	223,272
Revolving-term	4,970	6,131
Total	4,809,480	4,476,440
Commercial loans | Non-owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	23,614	68,647
Financing receivable, year two	68,572	50,571
Financing receivable, year three	50,276	169,711
Financing receivable, year four	158,484	130,877
Financing receivable, year five	121,836	100,674
Financing receivable, prior to year five	274,775	183,024
Revolving	853	963
Revolving-term	867	892
Total	699,277	705,359
Commercial loans | Non-owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	23,614	68,647
Financing receivable, year two	68,572	50,571
Financing receivable, year three	50,276	169,711
Financing receivable, year four	158,484	130,877
Financing receivable, year five	121,836	100,674
Financing receivable, prior to year five	274,775	183,024
Revolving	853	963
Revolving-term	867	892
Total	699,277	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	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	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	364,731	1,315,204
Financing receivable, year two	1,311,572	561,666
Financing receivable, year three	559,882	286,826
Financing receivable, year four	253,625	60,372
Financing receivable, year five	60,103	26,065
Financing receivable, prior to year five	179,862	165,225
Revolving	0	1
Revolving-term	0	0
Total	2,729,775	2,415,359
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	364,731	1,315,204
Financing receivable, year two	1,311,572	561,666
Financing receivable, year three	551,187	286,826
Financing receivable, year four	233,790	60,372
Financing receivable, year five	60,103	26,065
Financing receivable, prior to year five	179,862	165,225
Revolving	0	1
Revolving-term	0	0
Total	2,701,245	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	8,695	0
Financing receivable, year four	19,835	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	28,530	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	0	7,825
Financing receivable, year two	12,163	22,863
Financing receivable, year three	24,664	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	36,827	37,861
Commercial loans | Multifamily construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	7,825
Financing receivable, year two	12,163	22,863
Financing receivable, year three	24,664	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	36,827	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	11,668	3,960
Financing receivable, year three	3,959	0
Financing receivable, year four	0	1,962
Financing receivable, year five	1,924	0
Financing receivable, prior to year five	548	556
Revolving	0	0
Revolving-term	0	0
Total	18,099	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	11,668	3,960
Financing receivable, year three	3,959	0
Financing receivable, year four	0	1,962
Financing receivable, year five	1,924	0
Financing receivable, prior to year five	548	556
Revolving	0	0
Revolving-term	0	0
Total	18,099	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	31,784	146,595
Financing receivable, year two	142,275	35,640
Financing receivable, year three	24,226	14,509
Financing receivable, year four	12,434	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	76	77
Revolving	108,005	99,206
Revolving-term	0	0
Total	318,800	296,027
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	31,784	146,595
Financing receivable, year two	142,275	35,640
Financing receivable, year three	24,226	14,509
Financing receivable, year four	12,434	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	76	77
Revolving	108,005	99,206
Revolving-term	0	0
Total	318,800	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	6,613	90,311
Financing receivable, year two	106,419	42,636
Financing receivable, year three	29,026	13,362
Financing receivable, year four	10,575	1,775
Financing receivable, year five	1,775	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	154,408	148,084
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	6,613	90,311
Financing receivable, year two	106,419	42,636
Financing receivable, year three	29,026	13,362
Financing receivable, year four	10,575	1,775
Financing receivable, year five	1,775	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	154,408	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	20,055	70,902
Financing receivable, year two	70,792	47,536
Financing receivable, year three	47,176	76,088
Financing receivable, year four	75,511	51,023
Financing receivable, year five	49,952	83,212
Financing receivable, prior to year five	198,875	125,248
Revolving	248	798
Revolving-term	1,747	2,899
Total	464,356	457,706
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	20,055	70,902
Financing receivable, year two	70,792	47,536
Financing receivable, year three	47,176	57,423
Financing receivable, year four	57,012	47,716
Financing receivable, year five	46,661	67,042
Financing receivable, prior to year five	164,101	106,659
Revolving	248	798
Revolving-term	1,689	2,839
Total	407,734	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	18,499	2,196
Financing receivable, year five	2,180	6,019
Financing receivable, prior to year five	23,202	145
Revolving	0	0
Revolving-term	0	60
Total	43,881	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	1,111	10,151
Financing receivable, prior to year five	11,572	18,444
Revolving	0	0
Revolving-term	58	0
Total	12,741	48,371
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	32,359	97,855
Financing receivable, year two	66,798	54,852
Financing receivable, year three	52,225	53,945
Financing receivable, year four	46,437	30,639
Financing receivable, year five	27,519	17,351
Financing receivable, prior to year five	34,899	22,586
Revolving	125,345	122,304
Revolving-term	2,356	2,340
Total	387,938	401,872
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	32,359	88,139
Financing receivable, year two	58,371	51,453
Financing receivable, year three	48,943	44,882
Financing receivable, year four	36,976	24,711
Financing receivable, year five	23,289	11,859
Financing receivable, prior to year five	27,808	21,258
Revolving	113,186	112,759
Revolving-term	2,131	2,104
Total	343,063	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	213	0
Financing receivable, year three	29	7,396
Financing receivable, year four	7,047	0
Financing receivable, year five	838	4,396
Financing receivable, prior to year five	5,264	0
Revolving	7,543	5,613
Revolving-term	212	134
Total	21,146	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	8,214	3,399
Financing receivable, year three	3,253	1,667
Financing receivable, year four	2,414	5,928
Financing receivable, year five	3,392	1,096
Financing receivable, prior to year five	1,827	1,328
Revolving	4,616	3,932
Revolving-term	13	102
Total	23,729	27,168
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	45,360	178,118
Financing receivable, year two	180,252	156,837
Financing receivable, year three	152,777	63,614
Financing receivable, year four	50,402	67,047
Financing receivable, year five	57,421	96,818
Financing receivable, prior to year five	278,812	207,532
Revolving	285,169	291,108
Revolving-term	4,817	5,335
Total	1,055,010	1,066,409
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	44,563	176,110
Financing receivable, year two	178,656	156,360
Financing receivable, year three	152,443	63,221
Financing receivable, year four	50,108	66,515
Financing receivable, year five	57,209	96,302
Financing receivable, prior to year five	276,307	204,823
Revolving	0	0
Revolving-term	0	0
Total	759,286	763,331
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	44,563	176,110
Financing receivable, year two	178,656	156,360
Financing receivable, year three	152,443	62,369
Financing receivable, year four	49,114	66,063
Financing receivable, year five	56,757	95,988
Financing receivable, prior to year five	275,042	204,229
Revolving	0	0
Revolving-term	0	0
Total	756,575	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	872	0
Revolving	0	0
Revolving-term	0	0
Total	872	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	270	471
Revolving	0	0
Revolving-term	0	0
Total	270	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	994	452
Financing receivable, year five	452	0
Financing receivable, prior to year five	123	123
Revolving	0	0
Revolving-term	0	0
Total	1,569	1,136
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	797	2,008
Financing receivable, year two	1,596	477
Financing receivable, year three	334	393
Financing receivable, year four	294	532
Financing receivable, year five	212	516
Financing receivable, prior to year five	2,505	2,709
Revolving	285,169	291,108
Revolving-term	4,817	5,335
Total	295,724	303,078
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	797	2,005
Financing receivable, year two	1,585	474
Financing receivable, year three	334	393
Financing receivable, year four	294	532
Financing receivable, year five	197	516
Financing receivable, prior to year five	2,407	2,609
Revolving	284,426	290,512
Revolving-term	4,755	5,273
Total	294,795	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	3	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	0	94
Revolving	57	40
Revolving-term	0	0
Total	60	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	8	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	15	0
Financing receivable, prior to year five	0	0
Revolving	7	12
Revolving-term	0	62
Total	30	74
Consumer loans | Home equity and other | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	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	98	6
Revolving	679	544
Revolving-term	62	0
Total	$ 839	$ 553

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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Amount excluding accrued interest of financing receivable that can be withdrawn, repaid, and redrawn.

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