v3.26.3
LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, accrued interest receivable $ 678,000,000   $ 678,000,000   $ 635,000,000
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 $ 50,000,000 $ 71,000,000 $ 153,000,000 $ 230,000,000  
Mortgage servicing rights 80,000,000   80,000,000   $ 124,000,000
Modified loans that subsequently defaulted     164,000,000    
Financing receivable, troubled debt restructuring, commitment to lend 22,000,000   22,000,000   60,000,000
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
Unfunded Loan Commitment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, amortization of purchase discount $ 1,000,000 $ 6,000,000 $ 3,000,000 $ 17,000,000