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LOANS AND CREDIT QUALITY - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 6,063,216	$ 6,231,796
Nonaccrual	55,791	54,994
Total past due and nonaccrual	$ 65,886	$ 66,020
Nonaccrual, percent of total loans	0.92%	0.88%
Past due and nonaccrual, percent of total loans	1.09%	1.06%
Not past due, percent of total loans	98.91%	98.94%
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	$ 10,400	$ 11,300
Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	1,248	1,287
Level 3 | Recurring
Financing Receivable, Past Due [Line Items]
Single family LHFI	1,248	1,287
30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 3,709	$ 4,945
Past due, percent of total loans	0.06%	0.08%
60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 2,204	$ 1,727
Past due, percent of total loans	0.04%	0.03%
90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 4,182	$ 4,354
Past due, percent of total loans	0.07%	0.07%
Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	$ 5,997,330	$ 6,165,776
CRE
Financing Receivable, Past Due [Line Items]
Nonaccrual	21,800	21,966
CRE | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,916,365	4,036,165
Nonaccrual	21,800	21,966
Total past due and nonaccrual	21,800	21,966
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	0
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	3,894,565	4,014,199
CRE | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	545,313	570,750
Nonaccrual	16,089	16,230
Total past due and nonaccrual	16,089	16,230
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	529,224	554,520
CRE | Multifamily
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,934,442	2,992,675
Nonaccrual	1,915	1,915
Total past due and nonaccrual	1,915	1,915
CRE | Multifamily | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
CRE | Multifamily | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
CRE | Multifamily | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
CRE | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,932,527	2,990,760
CRE | Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	65,201	98,906
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	65,201	98,906
CRE | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	11,143	11,038
Nonaccrual	3,796	3,821
Total past due and nonaccrual	3,796	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	7,347	7,217
CRE | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	329,394	320,826
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	329,394	320,826
CRE | Single family construction to permanent
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	30,872	41,970
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	30,872	41,970
Commercial loans, adjusted for credit analysis | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	639,107	674,001
Nonaccrual	26,967	26,901
Total past due and nonaccrual	26,967	26,901
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	0	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	612,140	647,100
Commercial loans, adjusted for credit analysis | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	340,106	361,997
Nonaccrual		1,161
Total past due and nonaccrual	932	1,161
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	339,174	360,836
Commercial loans, adjusted for credit analysis | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	299,001	312,004
Nonaccrual		25,740
Total past due and nonaccrual	26,035	25,740
Commercial loans, adjusted for credit analysis | Commercial business | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	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	272,966	286,264
Consumer portfolio segment, adjusted for credit analysis
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,507,744	1,521,630
Nonaccrual	7,024	6,127
Total past due and nonaccrual	17,119	17,153
Consumer portfolio segment, adjusted for credit analysis | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,709	4,945
Consumer portfolio segment, adjusted for credit analysis | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,204	1,727
Consumer portfolio segment, adjusted for credit analysis | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,182	4,354
Consumer portfolio segment, adjusted for credit analysis | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,490,625	1,504,477
Consumer portfolio segment, adjusted for credit analysis | Single family
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,088,264	1,109,095
Nonaccrual		2,990
Total past due and nonaccrual	12,346	13,041
Consumer portfolio segment, adjusted for credit analysis | Single family | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	2,875	4,601
Consumer portfolio segment, adjusted for credit analysis | Single family | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,941	1,096
Consumer portfolio segment, adjusted for credit analysis | Single family | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,182	4,354
Consumer portfolio segment, adjusted for credit analysis | Single family | Current
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	1,075,918	1,096,054
Consumer portfolio segment, adjusted for credit analysis | Home equity and other
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	419,480	412,535
Nonaccrual	3,676	3,137
Total past due and nonaccrual	4,773	4,112
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	834	344
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	263	631
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	414,707	408,423
Commercial loans
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	4,555,472	4,710,166
Nonaccrual	26,967	26,901
Commercial loans | Real Estate Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	3,916,365	4,036,165
Commercial loans | Commercial and Industrial Sector
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	639,107	674,001
Commercial loans | Non-owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	545,313	570,750
Commercial loans | Multifamily construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	65,201	98,906
Commercial loans | CRE construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	11,143	11,038
Commercial loans | Single family construction
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	329,394	320,826
Commercial loans | Single family construction to permanent
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	30,872	41,970
Commercial loans | Single family construction to permanent | 30-59 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans | Single family construction to permanent | 60-89 days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans | Single family construction to permanent | 90+ days
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	0	0
Commercial loans | Owner occupied CRE
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	340,106	361,997
Nonaccrual	932	1,161
Commercial loans | Commercial business
Financing Receivable, Past Due [Line Items]
Loans before allowance for credit loss	299,001	312,004
Nonaccrual	$ 26,035	$ 25,740

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