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LOANS AND CREDIT QUALITY - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 7,486,382	$ 7,426,320
Nonaccrual	13,047	10,055
Total past due and nonaccrual	$ 31,049	$ 21,270
Nonaccrual, percent of total loans	0.17%	0.14%
Past due and nonaccrual, percent of total loans	0.41%	0.29%
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	$ 12,300	$ 10,600
Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	5,231	5,868
Level 3 | Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	5,231	5,868
30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 4,844	$ 4,823
Past due, percent of total loans	0.06%	0.06%
60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 1,899	$ 2,020
Past due, percent of total loans	0.03%	0.03%
90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 11,259	$ 4,372
Past due, percent of total loans	0.15%	0.06%
Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 7,455,333	$ 7,405,050
Not past due, percent of total loans	99.59%	99.71%
Commercial loans, adjusted for credit analysis | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 5,235,497	$ 5,261,502
Nonaccrual	0	0
Total past due and nonaccrual	5,732	0
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	0
Commercial loans, adjusted for credit analysis | Real Estate Sector | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,732	0
Commercial loans, adjusted for credit analysis | Real Estate Sector | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,229,765	5,261,502
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	830,984	803,110
Nonaccrual	8,186	6,790
Total past due and nonaccrual	8,236	6,790
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	50	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	822,748	796,320
Commercial loans, adjusted for credit analysis | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	652,284	658,085
Nonaccrual	0	0
Total past due and nonaccrual	0	0
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	652,284	658,085
Commercial loans, adjusted for credit analysis | Multifamily
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,975,654	3,975,754
Nonaccrual	0	0
Total past due and nonaccrual	0	0
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	0
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	3,975,654	3,975,754
Commercial loans, adjusted for credit analysis | Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	109,133	95,117
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	109,133	95,117
Commercial loans, adjusted for credit analysis | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	20,087	18,954
Nonaccrual	0	0
Total past due and nonaccrual	0	0
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	20,087	18,954
Commercial loans, adjusted for credit analysis | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	327,632	355,554
Nonaccrual	0	0
Total past due and nonaccrual	5,732	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	5,732	0
Commercial loans, adjusted for credit analysis | Single family construction | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	321,900	355,554
Commercial loans, adjusted for credit analysis | Single family construction to permanent
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	150,707	158,038
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	150,707	158,038
Commercial loans, adjusted for credit analysis | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	438,147	443,363
Nonaccrual	3,668	2,521
Total past due and nonaccrual	3,668	2,521
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	434,479	440,842
Commercial loans, adjusted for credit analysis | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	392,837	359,747
Nonaccrual	4,518	4,269
Total past due and nonaccrual	4,568	4,269
Commercial loans, adjusted for credit analysis | Commercial business | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	50	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	388,269	355,478
Consumer portfolio segment, adjusted for credit analysis
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,419,901	1,361,708
Nonaccrual	4,861	3,265
Total past due and nonaccrual	17,081	14,480
Consumer portfolio segment, adjusted for credit analysis | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,794	4,823
Consumer portfolio segment, adjusted for credit analysis | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,899	2,020
Consumer portfolio segment, adjusted for credit analysis | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,527	4,372
Consumer portfolio segment, adjusted for credit analysis | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,402,820	1,347,228
Consumer portfolio segment, adjusted for credit analysis | Single family
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,057,579	1,009,001
Nonaccrual	3,999	2,584
Total past due and nonaccrual	15,487	13,236
Consumer portfolio segment, adjusted for credit analysis | Single family | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,105	4,556
Consumer portfolio segment, adjusted for credit analysis | Single family | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,856	1,724
Consumer portfolio segment, adjusted for credit analysis | Single family | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	5,527	4,372
Consumer portfolio segment, adjusted for credit analysis | Single family | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,042,092	995,765
Consumer portfolio segment, adjusted for credit analysis | Home equity and other
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	362,322	352,707
Nonaccrual	862	681
Total past due and nonaccrual	1,594	1,244
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	267
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	43	296
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	$ 360,728	$ 351,463

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