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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 6,231,796	$ 7,422,904
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,710,166	5,898,324
Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	674,001	750,334
Commercial and industrial loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	570,750	641,885
Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	361,997	391,285
Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	312,004	359,049
Consumer Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,521,630	1,524,580
Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,109,095	1,140,279
Consumer Portfolio Segment | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	412,535	384,301
CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,992,675	3,940,189
CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	570,750	641,885
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	8,241
Land | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,420
Land | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Land | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	4,420
Land | Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Land | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,821
Land | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Land | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Land | CRE | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,821
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,759	4,134
1-4 Family | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,927	2,788
1-4 Family | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
1-4 Family | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	2,927	2,788
1-4 Family | Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	832	773
1-4 Family | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	573
1-4 Family | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
1-4 Family | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	573
1-4 Family | CRE | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,915
Multifamily | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Multifamily | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Multifamily | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Multifamily | Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Multifamily | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,915
Multifamily | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,915
Multifamily | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Multifamily | CRE | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	16,435	25,522
Non-residential real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	205	5,471
Non-residential real estate | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	205
Non-residential real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	5,471
Non-residential real estate | Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Non-residential real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	16,230	20,051
Non-residential real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Non-residential real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	16,230	16,230
Non-residential real estate | CRE | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	3,821
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,269	4,587
Other non-real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,269	4,587
Other non-real estate | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Other non-real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	3,269	4,587
Other non-real estate | Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0
Other non-real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Other non-real estate | CRE | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	0	0
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	33,619	34,243
Total | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	10,821	12,846
Total | Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	205
Total | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	10,616	12,846
Total | Consumer Portfolio Segment | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	832	773
Total | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	21,966	20,624
Total | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	1,915
Total | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	16,230	16,803
Total | CRE | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total LHFI	$ 3,821	$ 3,821

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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
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-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
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-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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