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Borrowings and Subordinated Debentures (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Unused Lines of Credit    
Debt Instrument [Line Items]    
Amount outstanding $ 0 $ 0
Current borrowing capacity 180,000,000.0  
Unused commitment fees 0  
AFX short-term borrowings    
Debt Instrument [Line Items]    
Amount outstanding 250,000,000.0 300,000,000.0
Federal Reserve Bank Advances    
Debt Instrument [Line Items]    
Loans pledged as collateral 2,600,000,000  
Amount outstanding 0 0
Federal Reserve Bank Advances | FHLB secured advances    
Debt Instrument [Line Items]    
Borrowing capacity description 1,900,000,000  
Federal Home Loan Bank of San Francisco    
Debt Instrument [Line Items]    
Loans pledged as collateral 6,300,000,000  
Securities pledged as collateral 2,000,000,000.0  
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Borrowing capacity description 6,000,000,000.0  
Current outstanding 1,904,000,000 1,318,000,000
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Current outstanding 141,000,000.0 $ 141,000,000.0
Federal Home Loan Bank of San Francisco | Unused Lines of Credit    
Debt Instrument [Line Items]    
Borrowing capacity description 141,000,000.0  
Maturity Overnight [Member] | AFX short-term borrowings    
Debt Instrument [Line Items]    
Amount outstanding $ 250,000,000.0