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LOANS AND CREDIT QUALITY - Amortized Cost of Collateral-dependent Loans by Class and Collateral Type (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	$ 13,852,209	$ 14,176,936
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	49,983	48,011
Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,001	0
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,225	2,962
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	18,283	18,026
Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	18,704	17,100
Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	4,770	4,121
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	5,802
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	460,081	482,170
Commercial and industrial | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	10,122	8,493
Commercial and industrial | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial and industrial | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,001	0
Commercial and industrial | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial and industrial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,790	0
Commercial and industrial | Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	958	3,819
Commercial and industrial | Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	373	0
Commercial and industrial | Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	4,674
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,291,597	5,355,252
Commercial real estate | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	1,711,611	1,740,277
Commercial real estate | Non-owner occupied | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	17,024	12,539
Commercial real estate | Non-owner occupied | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Non-owner occupied | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Non-owner occupied | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Non-owner occupied | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Non-owner occupied | Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	17,024	12,539
Commercial real estate | Non-owner occupied | Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Non-owner occupied | Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,291,597	5,355,252
Commercial real estate | Multifamily | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	14,493	17,869
Commercial real estate | Multifamily | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	14,493	17,869
Commercial real estate | Multifamily | Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	586,698	689,079
Commercial real estate | Owner occupied | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	722	1,870
Commercial real estate | Owner occupied | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied | Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	722	742
Commercial real estate | Owner occupied | Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied | Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	1,128
Commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	399,546	493,992
Commercial real estate | Construction and land development | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,225	2,962
Commercial real estate | Construction and land development | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,225	2,962
Commercial real estate | Construction and land development | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	4,017,120	3,970,803
Residential Real Estate | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	4,397	4,278
Residential Real Estate | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Residential Real Estate | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Residential Real Estate | Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Residential Real Estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	157
Residential Real Estate | Retail Building
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Residential Real Estate | Single Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	4,397	4,121
Residential Real Estate | Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	639,825	791,012
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	$ 745,731	$ 654,351

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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
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-Paragraph 2
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ 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
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-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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