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LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 27, 2025
Mar. 27, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, accrued interest receivable     $ 637,000,000   $ 637,000,000   $ 603,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]     Other assets   Other assets   Other assets
Financing receivable, amortization of purchase discount     $ 71,000,000 $ 107,000,000 $ 230,000,000 $ 415,000,000  
Financing receivable, threshold period past due     30 days   30 days    
Mortgage servicing rights     $ 98,000,000   $ 98,000,000   $ 64,000,000
Modified loans that subsequently defaulted         113,000,000    
Financing receivable, troubled debt restructuring, commitment to lend     17,000,000   17,000,000   55,000,000
Other secured financings | Federal Reserve Bank of Richmond | Secured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Long-term line of credit     0   0   $ 0
Purchase Money Note              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, term 5 years 5 years          
Unfunded Loan Commitment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, amortization of purchase discount     $ 6,000,000 $ 16,000,000 $ 17,000,000 $ 71,000,000