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Borrowings and Subordinated Debentures (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Debt Instrument [Line Items]      
Early Repayment of Subordinated Debt $ 12,372,000 $ 0  
Non‑recourse debt      
Debt Instrument [Line Items]      
Weighted average remaining maturity period 20 months    
Unused Lines of Credit      
Debt Instrument [Line Items]      
Amount outstanding $ 0   $ 0
Current borrowing capacity 75,000,000    
Unused commitment fees 0    
AFX borrowings      
Debt Instrument [Line Items]      
Amount outstanding 100,000,000   0
Federal Reserve Bank Advances      
Debt Instrument [Line Items]      
Loans pledged as collateral 2,100,000,000    
Amount outstanding 0   0
Federal Reserve Bank Advances | FHLB secured advances      
Debt Instrument [Line Items]      
Borrowing capacity description 1,670,180,000    
Federal Home Loan Bank of San Francisco      
Debt Instrument [Line Items]      
Loans pledged as collateral 5,700,000,000    
Federal Home Loan Bank of San Francisco | FHLB secured advances      
Debt Instrument [Line Items]      
Borrowing capacity description 3,919,613,000    
Current outstanding 340,000,000   332,000,000
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance      
Debt Instrument [Line Items]      
Current outstanding 135,000,000   135,000,000
Federal Home Loan Bank of San Francisco | Unused Lines of Credit      
Debt Instrument [Line Items]      
Borrowing capacity description $ 135,000,000    
Amount outstanding     $ 135,000,000