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LOANS AND LEASES - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 27, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing receivable, accrued interest receivable   $ 615,000,000   $ 615,000,000   $ 625,000,000
Financing receivable, amortization of purchase discount   $ 107,000,000 $ 275,000,000 $ 415,000,000 $ 535,000,000  
Financing receivable, threshold period past due   30 days   30 days    
Mortgage servicing rights   $ 62,000,000   $ 62,000,000   62,000,000
Modified loans that subsequently defaulted       39,000,000    
Financing receivable, troubled debt restructuring, commitment to lend   44,000,000   44,000,000   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   $ 16,000,000 $ 69,000,000 $ 71,000,000 $ 88,000,000