v3.26.1
LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
payment
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Net unamortized purchase premiums, discounts, and deferred loan fees and cost $ 56,000,000   $ 61,000,000
Accrued interest receivable $ 267,000,000   $ 276,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets *   Other assets *
Total loans $ 61,312,000,000   $ 60,900,000,000
Loans held for sale 140,000,000   201,000,000
Principal balance of loans sold, serviced loans 771,000,000   679,000,000
Total income from loans sold 7,000,000 $ 2,000,000  
Interest income $ 0 0  
Past due loans classification, minimum number of delinquent monthly payments | payment 2    
Past due loans classification, minimum number of days principal or interest unpaid 30 days    
Financing receivable, commitments threshold for risk classification approach $ 1,000,000    
Real estate acquired through foreclosure (prior year less than) 1,000,000   1,000,000
Mortgage loans in process of foreclosure 17,000,000   20,000,000
Nonaccrual      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Financing receivable, commitments threshold for evaluating individually 1,000,000    
Doubtful      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0   0
Principal forgiveness      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Modified, principal forgiveness (current year approximately, prior year less than) 0 $ 1,000,000  
Asset Pledged as Collateral without Right      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans held for sale 43,400,000,000   43,200,000,000
Commercial:      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 31,858,000,000   31,679,000,000
Threshold period past due 90 days    
Commercial real estate:      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 13,658,000,000   13,396,000,000
Consumer:      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 15,796,000,000   15,825,000,000
Threshold period past due 60 days    
Land Acquisition and Development | Commercial real estate:      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 247,000,000   257,000,000
Commercial and industrial | Commercial:      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 18,263,000,000   18,111,000,000
Commercial and industrial | Commercial: | Nonaccrual      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 83,000,000   $ 93,000,000