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LOANS AND CREDIT QUALITY - Aging of the Amortized Cost in Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	$ 14,568,795	$ 9,643,497
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	44,678	77,998
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	11,205	13,339
Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	38,316	6,082
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	94,199	97,419
Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	14,474,596	9,546,078
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	547,311	410,040
Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	488,048	402,307
Commercial and industrial | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,876	1,920
Commercial and industrial | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	436	82
Commercial and industrial | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	9,178	278
Commercial and industrial | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	11,490	2,280
Commercial and industrial | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	535,821	407,760
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	5,448,374	2,794,581
Commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	535,776	104,430
Commercial real estate | Construction and land development | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	522,789	103,989
Commercial real estate | Construction and land development | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,204	5,400
Commercial real estate | Construction and land development | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease 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 and lease receivables	2,987	140
Commercial real estate | Construction and land development | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	4,191	5,540
Commercial real estate | Construction and land development | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	531,585	98,890
Commercial real estate | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	5,448,374	2,794,581
Commercial real estate | Multifamily | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	5,221,446	2,793,251
Commercial real estate | Multifamily | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	2,095	1,940
Commercial real estate | Multifamily | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	0	0
Commercial real estate | Multifamily | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,614	0
Commercial real estate | Multifamily | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	3,709	1,940
Commercial real estate | Multifamily | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	5,444,665	2,792,641
Commercial real estate | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,864,040	1,657,597
Commercial real estate | Non-owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,743,818	1,621,182
Commercial real estate | Non-owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,000	513
Commercial real estate | Non-owner occupied | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	0	0
Commercial real estate | Non-owner occupied | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	14,018	0
Commercial real estate | Non-owner occupied | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	15,018	513
Commercial real estate | Non-owner occupied | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,849,022	1,657,084
Commercial real estate | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	709,239	360,100
Commercial real estate | Owner occupied | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	639,913	336,878
Commercial real estate | Owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	0	1,005
Commercial real estate | Owner occupied | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	0	0
Commercial real estate | Owner occupied | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,177	0
Commercial real estate | Owner occupied | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,177	1,005
Commercial real estate | Owner occupied | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	708,062	359,095
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	3,907,101	2,280,963
Residential Real Estate | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	12,756	13,662
Residential Real Estate | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	3,033	406
Residential Real Estate | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	6,422	502
Residential Real Estate | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	22,211	14,570
Residential Real Estate | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	3,884,890	2,266,393
Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	954,615	1,596,935
Auto | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	24,693	53,197
Auto | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	7,615	12,637
Auto | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	2,915	5,161
Auto | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	35,223	70,995
Auto | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	919,392	1,525,940
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	602,339	438,851
Other consumer | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,054	361
Other consumer | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	121	214
Other consumer | Greater than 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	5	1
Other consumer | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	1,180	576
Other consumer | Loans Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan and lease receivables	$ 601,159	$ 438,275

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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
-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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-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
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