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Borrowings and Subordinated Debentures - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Unused Lines of Credit    
Debt Instrument [Line Items]    
Amount outstanding $ 0 $ 0
Current borrowing capacity 180,000,000  
Unused commitment fees 0  
AFX short-term borrowings    
Debt Instrument [Line Items]    
Current outstanding 250,000,000  
Amount outstanding 250,000,000 0
Federal Reserve Bank Advances    
Debt Instrument [Line Items]    
Loans pledged as collateral 2,900,000,000  
Amount outstanding 0 0
Federal Reserve Bank Advances | FHLB secured advances    
Debt Instrument [Line Items]    
Borrowing capacity description 2,400,000,000  
Federal Home Loan Bank of San Francisco    
Debt Instrument [Line Items]    
Loans pledged as collateral 5,600,000,000  
Federal Home Loan Bank of San Francisco | Maturity Overnight [Member]    
Debt Instrument [Line Items]    
Current outstanding 629,000,000  
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Borrowing capacity description 3,600,000,000  
Current outstanding 629,000,000 0
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Current outstanding 112,000,000 $ 0
Federal Home Loan Bank of San Francisco | Unused Lines of Credit    
Debt Instrument [Line Items]    
Borrowing capacity description $ 112,000,000