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LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended
Mar. 27, 2023
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, accrued interest receivable   $ 633,000,000 $ 625,000,000
Financing receivable, amortization of purchase discount   $ 163,000,000  
Financing receivable, threshold period past due   30 days  
Mortgage servicing rights   $ 58,000,000 62,000,000
Modified loans that subsequently defaulted   84,000,000  
Financing receivable, troubled debt restructuring, commitment to lend   25,000,000 13,000,000
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
Purchase Money Note      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt instrument, term 5 years    
Notes payable $ 36,070,000,000.00    
FDIC Credit Facility      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
FDIC advances, maximum amount available $ 70,000,000,000    
Unfunded Loan Commitment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, amortization of purchase discount   $ 35,000,000