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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	$ 6,063,216	$ 6,231,796
CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	545,313	570,750
CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	2,934,442	2,992,675
CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	65,201	98,906
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	4,555,472	4,710,166
Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	639,107	674,001
Commercial and industrial loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	545,313	570,750
Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	340,106	361,997
Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	299,001	312,004
Commercial and industrial loans | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	65,201	98,906
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	1,507,744	1,521,630
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	1,088,264	1,109,095
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	33,153	33,619
Total | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	21,800	21,966
Total | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	16,089	16,230
Total | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	1,915	1,915
Total | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	3,796	3,821
Total | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		10,821
Total | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		205
Total | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	10,521	10,616
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	832	832
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	8,187	8,241
Land | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	3,796	3,821
Land | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Land | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Land | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	3,796	3,821
Land | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		4,420
Land | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		0
Land | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	4,391	4,420
Land | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	3,736	3,759
1-4 Family | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
1-4 Family | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
1-4 Family | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
1-4 Family | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
1-4 Family | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		2,927
1-4 Family | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		0
1-4 Family | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	2,904	2,927
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	832	832
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	1,915	1,915
Multifamily | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	1,915	1,915
Multifamily | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Multifamily | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	1,915	1,915
Multifamily | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Multifamily | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		0
Multifamily | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		0
Multifamily | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Multifamily | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	16,089	16,435
Non-residential real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	16,089	16,230
Non-residential real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	16,089	16,230
Non-residential real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Non-residential real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Non-residential real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		205
Non-residential real estate | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		205
Non-residential real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Non-residential real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	3,226	3,269
Other non-real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Other non-real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Other non-real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Other non-real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	0	0
Other non-real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		3,269
Other non-real estate | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss		0
Other non-real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	3,226	3,269
Other non-real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans before allowance for credit loss	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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