v3.26.1
LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, accrued interest receivable $ 646,000,000   $ 646,000,000   $ 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 $ 55,000,000 $ 75,000,000 $ 103,000,000 $ 159,000,000  
Mortgage servicing rights 116,000,000   116,000,000   $ 124,000,000
Modified loans that subsequently defaulted     168,000,000    
Financing receivable, troubled debt restructuring, commitment to lend 13,000,000   13,000,000   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 $ 4,000,000 $ 2,000,000 $ 12,000,000