v3.26.1
LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
payment
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
payment
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]          
Net unamortized purchase premiums, discounts, and deferred loan fees and cost $ 55,000,000   $ 55,000,000   $ 61,000,000
Accrued interest receivable $ 272,000,000   $ 272,000,000   $ 276,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets 1   Other assets 1   Other assets 1
Total loans $ 62,481,000,000   $ 62,481,000,000   $ 60,900,000,000
Loans held for sale 77,000,000   77,000,000   201,000,000
Principal balance of loans sold, serviced loans 987,000,000   987,000,000   679,000,000
Total income from loans sold 5,000,000 $ 2,000,000 12,000,000 $ 5,000,000  
Interest income $ 0 0 $ 0 0  
Past due loans classification, minimum number of delinquent monthly payments | payment 2   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   $ 1,000,000    
Financing receivable, modified, subsequent default (less than) 1,000,000 1,000,000 1,000,000 2,000,000  
Real estate acquired through foreclosure (prior year less than) 2,000,000   2,000,000   1,000,000
Mortgage loans in process of foreclosure 19,000,000   19,000,000   20,000,000
Nonaccrual          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing receivable, commitments threshold for evaluating individually 1,000,000   1,000,000    
Doubtful          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 0   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 0 $ 1,000,000  
Asset Pledged as Collateral without Right          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans held for sale 44,000,000,000.0   44,000,000,000.0   43,200,000,000
Commercial:          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans $ 32,640,000,000   $ 32,640,000,000   31,679,000,000
Threshold period past due 90 days   90 days    
Commercial real estate:          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans $ 14,063,000,000   $ 14,063,000,000   13,396,000,000
Consumer:          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans $ 15,778,000,000   $ 15,778,000,000   15,825,000,000
Threshold period past due 60 days   60 days    
Land Acquisition and Development | Commercial real estate:          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans $ 251,000,000   $ 251,000,000   257,000,000
Commercial and industrial | Commercial:          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 19,131,000,000   19,131,000,000   18,111,000,000
Commercial and industrial | Commercial: | Nonaccrual          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans $ 96,000,000   $ 96,000,000   $ 93,000,000