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LOANS AND CREDIT QUALITY - Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 7,380,050	$ 7,422,904
Nonaccrual	36,374	38,976
Total past due and nonaccrual	$ 48,348	$ 53,518
Nonaccrual, percent of total loans	0.49%	0.53%
Past due and nonaccrual, percent of total loans	0.66%	0.72%
Percent of total loans	100.00%	100.00%
Federal Housing Administration, Veteran Affairs, or Small Business Administration
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	$ 11,300	$ 12,400
Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	1,286	1,280
Level 3 | Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	1,286	1,280
30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 3,824	$ 6,148
Past due, percent of total loans	0.05%	0.08%
60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 2,691	$ 4,133
Past due, percent of total loans	0.04%	0.05%
90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 5,459	$ 4,261
Past due, percent of total loans	0.08%	0.06%
Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 7,331,702	$ 7,369,386
Not past due, percent of total loans	99.34%	99.28%
Commercial loans, adjusted for credit analysis
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	$ 16,230	$ 16,803
Commercial loans, adjusted for credit analysis | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,078,540	5,147,990
Nonaccrual	21,966	20,624
Total past due and nonaccrual	21,966	22,539
Commercial loans, adjusted for credit analysis | Real Estate Sector | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Real Estate Sector | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	1,915
Commercial loans, adjusted for credit analysis | Real Estate Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Real Estate Sector | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,056,574	5,125,451
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	749,163	750,334
Nonaccrual	11,509	14,392
Total past due and nonaccrual	12,004	14,392
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	495	0
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	737,159	735,942
Commercial loans, adjusted for credit analysis | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	612,937	641,885
Nonaccrual	16,230	16,803
Commercial loans, adjusted for credit analysis | Non-owner occupied CRE | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Non-owner occupied CRE | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Non-owner occupied CRE | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Non-owner occupied CRE | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	596,707	625,082
Commercial loans, adjusted for credit analysis | Multifamily
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,935,158	3,940,189
Nonaccrual	1,915	0
Total past due and nonaccrual	1,915	1,915
Commercial loans, adjusted for credit analysis | Multifamily | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Multifamily | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	1,915
Commercial loans, adjusted for credit analysis | Multifamily | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,933,243	3,938,274
Commercial loans, adjusted for credit analysis | Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	191,179	168,049
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial loans, adjusted for credit analysis | Multifamily construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Multifamily construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Multifamily construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Multifamily construction | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	191,179	168,049
Commercial loans, adjusted for credit analysis | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	6,611	18,513
Nonaccrual	3,821	3,821
Total past due and nonaccrual	3,821	3,821
Commercial loans, adjusted for credit analysis | CRE construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | CRE construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | CRE construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | CRE construction | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,790	14,692
Commercial loans, adjusted for credit analysis | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	268,621	274,050
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial loans, adjusted for credit analysis | Single family construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Single family construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Single family construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Single family construction | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	268,621	274,050
Commercial loans, adjusted for credit analysis | Single family construction to permanent
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	64,034	105,304
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial loans, adjusted for credit analysis | Single family construction to permanent | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Single family construction to permanent | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Single family construction to permanent | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Single family construction to permanent | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	64,034	105,304
Commercial loans, adjusted for credit analysis | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	372,452	391,285
Nonaccrual	666	706
Total past due and nonaccrual	1,015	706
Commercial loans, adjusted for credit analysis | Owner occupied CRE | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	349	0
Commercial loans, adjusted for credit analysis | Owner occupied CRE | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Owner occupied CRE | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Owner occupied CRE | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	371,437	390,579
Commercial loans, adjusted for credit analysis | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	376,711	359,049
Nonaccrual	10,843	13,686
Total past due and nonaccrual	10,989	13,686
Commercial loans, adjusted for credit analysis | Commercial business | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	146	0
Commercial loans, adjusted for credit analysis | Commercial business | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Commercial business | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans, adjusted for credit analysis | Commercial business | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	365,722	345,363
Consumer portfolio segment, adjusted for credit analysis
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,552,347	1,524,580
Nonaccrual	2,899	3,960
Total past due and nonaccrual	14,378	16,587
Consumer portfolio segment, adjusted for credit analysis | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,329	6,148
Consumer portfolio segment, adjusted for credit analysis | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,691	2,218
Consumer portfolio segment, adjusted for credit analysis | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,459	4,261
Consumer portfolio segment, adjusted for credit analysis | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,537,969	1,507,993
Consumer portfolio segment, adjusted for credit analysis | Single family
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,152,004	1,140,279
Nonaccrual	1,324	2,650
Total past due and nonaccrual	11,423	14,078
Consumer portfolio segment, adjusted for credit analysis | Single family | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,640	5,174
Consumer portfolio segment, adjusted for credit analysis | Single family | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,000	1,993
Consumer portfolio segment, adjusted for credit analysis | Single family | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,459	4,261
Consumer portfolio segment, adjusted for credit analysis | Single family | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,140,581	1,126,201
Consumer portfolio segment, adjusted for credit analysis | Home equity and other
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	400,343	384,301
Nonaccrual	1,575	1,310
Total past due and nonaccrual	2,955	2,509
Consumer portfolio segment, adjusted for credit analysis | Home equity and other | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	689	974
Consumer portfolio segment, adjusted for credit analysis | Home equity and other | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	691	225
Consumer portfolio segment, adjusted for credit analysis | Home equity and other | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Consumer portfolio segment, adjusted for credit analysis | Home equity and other | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	397,388	381,792
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,827,703	5,898,324
Nonaccrual	11,509	14,392
Commercial loans | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,078,540	5,147,990
Commercial loans | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	749,163	750,334
Commercial loans | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	612,937	641,885
Commercial loans | Multifamily
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,935,158	3,940,189
Commercial loans | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	6,611	18,513
Commercial loans | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	268,621	274,050
Commercial loans | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	372,452	391,285
Nonaccrual		706
Commercial loans | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 376,711	359,049
Nonaccrual		$ 13,686

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