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LOANS AND CREDIT QUALITY - Aging of the Amortized Cost in Past Due Loans (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
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	35,209	43,873
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	8,347	14,586
Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	33,447	34,686
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	77,003	93,145
Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	13,775,206	14,083,791
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	460,081	482,170
Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	419,353	439,446
Commercial and industrial | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	1,861	3,277
Commercial and industrial | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	1,011	1,066
Commercial and industrial | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	8,490	8,024
Commercial and industrial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	11,362	12,367
Commercial and industrial | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	448,719	469,803
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,291,597	5,355,252
Commercial real estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,291,597	5,355,252
Commercial real estate | Multifamily | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,105,497	5,146,307
Commercial real estate | Multifamily | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Multifamily | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	1,614
Commercial real estate | Multifamily | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	1,614
Commercial real estate | Multifamily | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	5,291,597	5,353,638
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 | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	1,586,584	1,626,072
Commercial real estate | Non-owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	50
Commercial real estate | Non-owner occupied | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Non-owner occupied | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	11,586	11,586
Commercial real estate | Non-owner occupied | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	11,586	11,636
Commercial real estate | Non-owner occupied | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	1,700,025	1,728,641
Commercial real estate | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	586,698	689,079
Commercial real estate | Owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	529,564	632,804
Commercial real estate | Owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Owner occupied | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	1,349
Commercial real estate | Owner occupied | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	272	226
Commercial real estate | Owner occupied | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	272	1,575
Commercial real estate | Owner occupied | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	586,426	687,504
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 | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	396,321	491,030
Commercial real estate | Construction and land development | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	0	0
Commercial real estate | Construction and land development | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,225	2,962
Commercial real estate | Construction and land development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,225	2,962
Commercial real estate | Construction and land development | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	396,321	491,030
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	4,017,120	3,970,803
Residential Real Estate | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	13,955	14,274
Residential Real Estate | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	2,828	4,944
Residential Real Estate | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	7,459	7,187
Residential Real Estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	24,242	26,405
Residential Real Estate | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3,992,878	3,944,398
Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	639,825	791,012
Auto | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	19,122	25,984
Auto | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	4,356	7,078
Auto | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	2,412	3,086
Auto | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	25,890	36,148
Auto | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	613,935	754,864
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	745,731	654,351
Other consumer | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	271	288
Other consumer | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	152	149
Other consumer | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	3	1
Other consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	426	438
Other consumer | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables	$ 745,305	$ 653,913

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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
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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-Publisher FASB
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