LOANS AND LEASES - Schedule of Loans by Class (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 151,034	$ 147,930	$ 141,269
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	124,538	120,734
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	46,574	44,721
Commercial \| Capital call lines
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	34,203	31,791
Commercial \| Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,904	17,660
Commercial \| Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,624	2,778
Commercial \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,233	23,784
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	26,496	27,196
Consumer \| Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	21,566	21,861
Consumer \| Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,868	2,863
Consumer \| Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,261	1,416
Consumer \| Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 801	$ 1,056