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Borrowings and Subordinated Debentures (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Borrowings $ 250,399 $ 905,812
Non‑recourse debt    
Debt Instrument [Line Items]    
Amount $ 399 $ 812
Rate 6.82% 6.41%
AFX borrowings    
Debt Instrument [Line Items]    
Amount $ 0 $ 40,000
Rate 0.00% 0.81%
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Amount $ 115,000 $ 735,000
Rate 1.14% 0.59%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Amount $ 135,000 $ 130,000
Rate 1.15% 0.55%