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LOANS AND CREDIT QUALITY - Aging Analysis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | $ 7,333,254 | $ 7,422,904
Nonaccrual | 40,320 | 38,976
Total past due and nonaccrual | $ 50,873 | $ 53,518
Nonaccrual, percent of total loans | 0.55% | 0.53%
Past due and nonaccrual, percent of total loans | 0.69% | 0.72%
Not past due, percent of total loans | 99.31% | 99.28%
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 | $ 11,000 | $ 12,400
Recurring |  |
Financing Receivable, Past Due [Line Items] |  |
Single family LHFI | 1,329 | 1,280
Level 3 | Recurring |  |
Financing Receivable, Past Due [Line Items] |  |
Single family LHFI | 1,329 | 1,280
30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | $ 3,719 | $ 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 | $ 1,867 | $ 4,133
Past due, percent of total loans | 0.02% | 0.05%
90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | $ 4,967 | $ 4,261
Past due, percent of total loans | 0.07% | 0.06%
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | $ 7,282,381 | $ 7,369,386
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 711,137 | 750,334
Nonaccrual | 12,232 | 14,392
Total past due and nonaccrual | 12,302 | 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 | 70 | 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 | 698,835 | 735,942
Commercial loans, adjusted for credit analysis | Owner occupied CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 365,138 | 391,285
Nonaccrual | 1,194 | 706
Total past due and nonaccrual | 1,194 | 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 | 0 | 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 | 363,944 | 390,579
Commercial loans, adjusted for credit analysis | Commercial business |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 345,999 | 359,049
Nonaccrual | 11,038 | 13,686
Total past due and nonaccrual | 11,108 | 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 | 70 | 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 | 334,891 | 345,363
Consumer portfolio segment, adjusted for credit analysis |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 1,544,619 | 1,524,580
Nonaccrual | 6,122 | 3,960
Total past due and nonaccrual | 16,605 | 16,587
Consumer portfolio segment, adjusted for credit analysis | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 3,649 | 6,148
Consumer portfolio segment, adjusted for credit analysis | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 1,867 | 2,218
Consumer portfolio segment, adjusted for credit analysis | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 4,967 | 4,261
Consumer portfolio segment, adjusted for credit analysis | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 1,528,014 | 1,507,993
Consumer portfolio segment, adjusted for credit analysis | Single family |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 1,137,981 | 1,140,279
Nonaccrual | 3,369 | 2,650
Total past due and nonaccrual | 12,537 | 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 | 2,531 | 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 | 1,670 | 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 | 4,967 | 4,261
Consumer portfolio segment, adjusted for credit analysis | Single family | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 1,125,444 | 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 | 406,638 | 384,301
Nonaccrual | 2,753 | 1,310
Total past due and nonaccrual | 4,068 | 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 | 1,118 | 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 | 197 | 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 | 402,570 | 381,792
Commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 5,788,635 | 5,898,324
Nonaccrual | 12,232 | 14,392
Commercial loans | Real Estate Sector |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 5,077,498 | 5,147,990
Commercial loans | Commercial and Industrial Sector |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 711,137 | 750,334
Commercial loans | Non-owner occupied CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 590,956 | 641,885
Commercial loans | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 3,950,941 | 3,940,189
Commercial loans | CRE construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 9,631 | 18,513
Commercial loans | Single family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 314,335 | 274,050
Commercial loans | Owner occupied CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 365,138 | 391,285
Nonaccrual |  | 706
Commercial loans | Commercial business |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 345,999 | 359,049
Nonaccrual |  | 13,686
CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 21,966 | 20,624
Total past due and nonaccrual | 16,230 | 16,803
CRE | Real Estate Sector |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 5,077,498 | 5,147,990
Nonaccrual | 21,966 | 20,624
Total past due and nonaccrual | 21,966 | 22,539
CRE | Real Estate Sector | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Real Estate Sector | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 1,915
CRE | Real Estate Sector | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Real Estate Sector | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 5,055,532 | 5,125,451
CRE | Non-owner occupied CRE |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 590,956 | 641,885
Nonaccrual | 16,230 | 16,803
CRE | Non-owner occupied CRE | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Non-owner occupied CRE | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Non-owner occupied CRE | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Non-owner occupied CRE | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 574,726 | 625,082
CRE | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss |  | 3,940,189
Nonaccrual |  | 0
Total past due and nonaccrual |  | 1,915
CRE | Multifamily | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss |  | 0
CRE | Multifamily | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss |  | 1,915
CRE | Multifamily | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss |  | 0
CRE | Multifamily | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss |  | 3,938,274
CRE | Multifamily construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 157,412 | 168,049
Nonaccrual | 0 | 0
Total past due and nonaccrual | 0 | 0
CRE | Multifamily construction | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Multifamily construction | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Multifamily construction | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Multifamily construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 157,412 | 168,049
CRE | CRE construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 9,631 | 18,513
Nonaccrual | 3,821 | 3,821
Total past due and nonaccrual | 3,821 | 3,821
CRE | CRE construction | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | CRE construction | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | CRE construction | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | CRE construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 5,810 | 14,692
CRE | Single family construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 314,335 | 274,050
Nonaccrual | 0 | 0
Total past due and nonaccrual | 0 | 0
CRE | Single family construction | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Single family construction | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Single family construction | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Single family construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 314,335 | 274,050
CRE | Single family construction to permanent |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 54,223 | 105,304
Nonaccrual | 0 | 0
Total past due and nonaccrual | 0 | 0
CRE | Single family construction to permanent | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Single family construction to permanent | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Single family construction to permanent | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 | 0
CRE | Single family construction to permanent | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 54,223 | 105,304
CRE | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 3,950,941 |
Nonaccrual | 1,915 | $ 0
Total past due and nonaccrual | 1,915 |
CRE | Multifamily | 30-59 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 |
CRE | Multifamily | 60-89 days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 |
CRE | Multifamily | 90+ days |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | 0 |
CRE | Multifamily | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans before allowance for credit loss | $ 3,949,026 |

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Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
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Data Type: | na
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