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Borrowings and Subordinated Debentures (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings $ 1,187,226 $ 467,342
Non‑recourse debt    
Debt Instrument [Line Items]    
Amount $ 226 $ 342
Rate 7.04% 6.87%
AFX borrowings    
Debt Instrument [Line Items]    
Amount $ 96,000 $ 0
Rate 2.10% 0.00%
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Amount $ 945,000 $ 332,000
Rate 2.08% 1.41%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Amount $ 146,000 $ 135,000
Rate 1.97% 1.34%