LOANS AND LEASES - Schedule of Loans by Class (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 147,930	$ 140,221	$ 133,302
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	120,734	112,377
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	44,721	43,559
Commercial | Capital call lines
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	31,791	25,501
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,660	16,842
Commercial | Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,778	3,193
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,784	23,282
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	27,196	27,844
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	21,861	22,768
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,863	2,567
Consumer | Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,416	1,523
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 1,056	$ 986