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LOANS AND CREDIT QUALITY - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	$ 5,542,849	$ 5,244,180
Nonaccrual	$ 12,201	$ 20,722
Nonaccrual, percent of total loans	0.22%	0.40%
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	$ 8,400	$ 14,700
Fair Value, Recurring
Financing Receivable, Past Due [Line Items]
Fair value of loans held for investment	7,287	7,108
Level 3 | Fair Value, Recurring
Financing Receivable, Past Due [Line Items]
Fair value of loans held for investment	7,287	7,108
30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	$ 1,208	$ 2,389
Past due, percent of total loans	0.02%	0.05%
60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	$ 894	$ 553
Past due, percent of total loans	0.02%	0.01%
90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	$ 6,717	$ 11,476
Past due, percent of total loans	0.12%	0.22%
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	$ 21,020	$ 35,140
Past due and nonaccrual, percent of total loans	0.38%	0.67%
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	$ 5,521,829	$ 5,209,040
Not past due, percent of total loans	99.62%	99.33%
Commercial loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 8,591	$ 14,105
Commercial loans | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,568	4,922
Commercial loans | Commercial business
Financing Receivable, Past Due [Line Items]
Nonaccrual	5,023	9,183
Commercial Portfolio Segment, Adjusted For Credit Analysis | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	3,616,862	2,811,325
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Real Estate Sector | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Real Estate Sector | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Real Estate Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Real Estate Sector | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Real Estate Sector | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	3,616,862	2,811,325
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	859,578	1,112,979
Nonaccrual	8,591	14,105
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial and Industrial Sector | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	198	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial and Industrial Sector | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial and Industrial Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial and Industrial Sector | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	8,789	14,105
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial and Industrial Sector | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	850,789	1,098,874
Commercial Portfolio Segment, Adjusted For Credit Analysis | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	705,359	829,538
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Non-owner occupied CRE | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Non-owner occupied CRE | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Non-owner occupied CRE | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Non-owner occupied CRE | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Non-owner occupied CRE | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	705,359	829,538
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	2,415,359	1,428,092
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	2,415,359	1,428,092
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	37,861	115,329
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily construction | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Multifamily construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	37,861	115,329
Commercial Portfolio Segment, Adjusted For Credit Analysis | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	14,172	27,285
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | CRE construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | CRE construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | CRE construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | CRE construction | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | CRE construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	14,172	27,285
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	296,027	259,170
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	296,027	259,170
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction to permanent
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	148,084	151,911
Nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction to permanent | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction to permanent | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction to permanent | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction to permanent | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Single family construction to permanent | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	148,084	151,911
Commercial Portfolio Segment, Adjusted For Credit Analysis | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	457,706	467,256
Nonaccrual	3,568	4,922
Commercial Portfolio Segment, Adjusted For Credit Analysis | Owner occupied CRE | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Owner occupied CRE | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Owner occupied CRE | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Owner occupied CRE | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	3,568	4,922
Commercial Portfolio Segment, Adjusted For Credit Analysis | Owner occupied CRE | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	454,138	462,334
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	401,872	645,723
Nonaccrual	5,023	9,183
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial business | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	198	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial business | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial business | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial business | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	5,221	9,183
Commercial Portfolio Segment, Adjusted For Credit Analysis | Commercial business | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	396,651	636,540
Consumer loans-single family
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,610	6,617
Consumer loans-single family | Single family
Financing Receivable, Past Due [Line Items]
Nonaccrual	2,802
Consumer loans-single family | Home equity and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	808
Consumer Portfolio Segment, Adjusted For Credit Analysis
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	1,066,409	1,319,876
Nonaccrual	3,610	6,617
Consumer Portfolio Segment, Adjusted For Credit Analysis | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	1,010	2,389
Consumer Portfolio Segment, Adjusted For Credit Analysis | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	894	553
Consumer Portfolio Segment, Adjusted For Credit Analysis | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	6,717	11,476
Consumer Portfolio Segment, Adjusted For Credit Analysis | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	12,231	21,035
Consumer Portfolio Segment, Adjusted For Credit Analysis | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	1,054,178	1,298,841
Consumer Portfolio Segment, Adjusted For Credit Analysis | Single family
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	763,331	915,123
Nonaccrual	2,802	4,883
Consumer Portfolio Segment, Adjusted For Credit Analysis | Single family | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	892	2,161
Consumer Portfolio Segment, Adjusted For Credit Analysis | Single family | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	820	418
Consumer Portfolio Segment, Adjusted For Credit Analysis | Single family | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	6,717	11,476
Consumer Portfolio Segment, Adjusted For Credit Analysis | Single family | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	11,231	18,938
Consumer Portfolio Segment, Adjusted For Credit Analysis | Single family | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	752,100	896,185
Consumer Portfolio Segment, Adjusted For Credit Analysis | Home equity and other
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	303,078	404,753
Nonaccrual	808	1,734
Consumer Portfolio Segment, Adjusted For Credit Analysis | Home equity and other | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	118	228
Consumer Portfolio Segment, Adjusted For Credit Analysis | Home equity and other | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	74	135
Consumer Portfolio Segment, Adjusted For Credit Analysis | Home equity and other | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	0	0
Consumer Portfolio Segment, Adjusted For Credit Analysis | Home equity and other | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total past due and nonaccrual	1,000	2,097
Consumer Portfolio Segment, Adjusted For Credit Analysis | Home equity and other | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance allowance for credit loss	$ 302,078	$ 402,656

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