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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 7,444,729	$ 7,422,904
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,907,639	5,898,324
Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	769,407	750,334
Commercial and industrial loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	633,401	641,885
Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	381,943	391,285
Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	387,464	359,049
Commercial and industrial loans | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,929,679	3,940,189
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,537,090	1,524,580
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,149,940	1,140,279
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	44,525	34,243
Total | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	32,914	20,624
Total | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,801	16,803
Total | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,824	3,821
Total | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Total | CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,374
Total | Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,843	12,846
Total | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,843	12,846
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	768	773
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	768	773
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,004	4,134
1-4 Family | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	561	573
1-4 Family | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	561	573
1-4 Family | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
1-4 Family | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,675	2,788
1-4 Family | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,675	2,788
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	768	773
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	768	773
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	12,289	0
Multifamily | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	12,289	0
Multifamily | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Multifamily | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Multifamily | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,374
Multifamily | Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Multifamily | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Multifamily | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,484	25,522
Non-residential real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,064	20,051
Non-residential real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,240	16,230
Non-residential real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,824	3,821
Non-residential real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate | CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate | Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,420	5,471
Non-residential real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,420	5,471
Non-residential real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Non-residential real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,748	4,587
Other non-real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,748	4,587
Other non-real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,748	4,587
Other non-real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 0	$ 0

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+ References

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-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
-Topic 326
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-Section 50
-Paragraph 5
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-Publisher FASB
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