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LOANS AND CREDIT QUALITY - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 7,426,320	$ 5,542,849
Nonaccrual	$ 10,055	$ 12,201
Nonaccrual, percent of total loans	0.14%	0.22%
Total past due and nonaccrual	$ 21,270	$ 21,020
Total past due and nonaccrual, percent of total loans	0.29%	0.38%
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	$ 10,600	$ 8,400
Fair Value, Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	5,868	7,287
Fair Value, Recurring | Level 3
Financing Receivable, Past Due [Line Items]
Single family LHFI	5,868	7,287
30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 4,823	$ 1,208
Past due, percent of total loans	0.06%	0.02%
60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 2,020	$ 894
Past due, percent of total loans	0.03%	0.02%
90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 4,372	$ 6,717
Past due, percent of total loans	0.06%	0.12%
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 7,405,050	$ 5,521,829
Current, percent of total loans	99.71%	99.62%
Commercial business | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 5,261,502	$ 3,616,862
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | Real Estate Sector | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Real Estate Sector | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Real Estate Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Real Estate Sector | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,261,502	3,616,862
Commercial business | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	803,110	859,578
Nonaccrual	6,790	8,591
Total past due and nonaccrual	6,790	8,789
Commercial business | Commercial and Industrial Sector | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	198
Commercial business | Commercial and Industrial Sector | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Commercial and Industrial Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Commercial and Industrial Sector | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	796,320	850,789
Commercial business | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	658,085	705,359
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | Non-owner occupied CRE | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Non-owner occupied CRE | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Non-owner occupied CRE | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Non-owner occupied CRE | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	658,085	705,359
Commercial business | Multifamily
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,975,754	2,415,359
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | Multifamily | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Multifamily | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Multifamily | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Multifamily | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,975,754	2,415,359
Commercial business | Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	95,117	37,861
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | Multifamily construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Multifamily construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Multifamily construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Multifamily construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	95,117	37,861
Commercial business | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	18,954	14,172
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | CRE construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | CRE construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | CRE construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | CRE construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	18,954	14,172
Commercial business | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	355,554	296,027
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | Single family construction | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Single family construction | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Single family construction | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Single family construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	355,554	296,027
Commercial business | Single family construction to permanent
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	158,038	148,084
Nonaccrual	0	0
Total past due and nonaccrual	0	0
Commercial business | Single family construction to permanent | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Single family construction to permanent | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Single family construction to permanent | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Single family construction to permanent | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	158,038	148,084
Commercial business | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	443,363	457,706
Nonaccrual	2,521	3,568
Total past due and nonaccrual	2,521	3,568
Commercial business | Owner occupied CRE | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Owner occupied CRE | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Owner occupied CRE | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Owner occupied CRE | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	440,842	454,138
Commercial business | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	359,747	401,872
Nonaccrual	4,269	5,023
Total past due and nonaccrual	4,269	5,221
Commercial business | Commercial business | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	198
Commercial business | Commercial business | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Commercial business | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial business | Commercial business | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	355,478	396,651
Consumer loans
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,361,708	1,066,409
Nonaccrual	3,265	3,610
Total past due and nonaccrual	14,480	12,231
Consumer loans | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,823	1,010
Consumer loans | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,020	894
Consumer loans | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,372	6,717
Consumer loans | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,347,228	1,054,178
Consumer loans | Single family
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,009,001	763,331
Nonaccrual	2,584	2,802
Total past due and nonaccrual	13,236	11,231
Consumer loans | Single family | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,556	892
Consumer loans | Single family | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,724	820
Consumer loans | Single family | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,372	6,717
Consumer loans | Single family | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	995,765	752,100
Consumer loans | Home equity and other
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	352,707	303,078
Nonaccrual	681	808
Total past due and nonaccrual	1,244	1,000
Consumer loans | Home equity and other | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	267	118
Consumer loans | Home equity and other | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	296	74
Consumer loans | Home equity and other | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Consumer loans | Home equity and other | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 351,463	$ 302,078

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