v3.26.1
LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, accrued interest receivable $ 639,000,000   $ 635,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets   Other assets
Financing receivable, amortization of purchase discount $ 48,000,000 $ 84,000,000  
Mortgage servicing rights 116,000,000   $ 124,000,000
Modified loans that subsequently defaulted 174,000,000    
Financing receivable, troubled debt restructuring, commitment to lend 19,000,000   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
Unfunded Loan Commitment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, amortization of purchase discount $ 1,000,000 $ 8,000,000