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LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 27, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing receivable, accrued interest receivable   $ 664,000,000   $ 664,000,000   $ 625,000,000
Financing receivable, amortization of purchase discount   $ 145,000,000 $ 243,000,000 $ 308,000,000 $ 260,000,000  
Financing receivable, threshold period past due   30 days   30 days    
Mortgage servicing rights   $ 64,000,000   $ 64,000,000   62,000,000
Modified loans that subsequently defaulted       31,000,000    
Financing receivable, troubled debt restructuring, commitment to lend   39,000,000   39,000,000   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   $ 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   $ 20,000,000 $ 17,000,000 $ 56,000,000 $ 20,000,000