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Loans and Leases - Amortized Cost Within Twelve Months (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 7 $ 4
Principal Forgiveness    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1 0
Combination - Interest Rate Reduction & Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1 4
Loans held for investment | Commercial real estate | Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 4  
Loans held for investment | Commercial real estate | Principal Forgiveness    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0  
Loans held for investment | Commercial real estate | Combination - Interest Rate Reduction & Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0  
Loans held for investment | One-to-four family first mortgage | Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 2 4
Loans held for investment | One-to-four family first mortgage | Principal Forgiveness    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1 0
Loans held for investment | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1 $ 4
Other loans held for investment | Commercial and industrial | Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 1  
Other loans held for investment | Commercial and industrial | Principal Forgiveness    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 0  
Other loans held for investment | Commercial and industrial | Combination - Interest Rate Reduction & Term Extension    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 0