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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 7,333,254	$ 7,422,904
CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	590,956	641,885
CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,950,941
CRE | Multifamily construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	157,412	168,049
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,788,635	5,898,324
Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	711,137	750,334
Commercial and industrial loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	590,956	641,885
Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	365,138	391,285
Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	345,999	359,049
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,544,619	1,524,580
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,137,981	1,140,279
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	31,959	34,243
Total | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	21,966	20,624
Total | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,230	16,803
Total | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Total | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,821	3,821
Total | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	9,161	12,846
Total | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	205
Total | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,956	12,846
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	832	773
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,795	4,134
1-4 Family | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	573
1-4 Family | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	573
1-4 Family | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
1-4 Family | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,963	2,788
1-4 Family | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,963	2,788
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	832	773
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | Commercial and industrial loans | Owner occupied CRE
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
Multifamily | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,676	25,522
Non-residential real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,051	20,051
Non-residential real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,230	16,230
Non-residential real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,821	3,821
Non-residential real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,625	5,471
Non-residential real estate | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	205
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 | 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	1,573	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 | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	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 | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,573	4,587
Other non-real estate | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,573	4,587
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 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
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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