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Borrowings and Subordinated Debentures (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Borrowings $ 1,513,166 $ 467,342
Non‑recourse debt    
Debt Instrument [Line Items]    
Amount $ 166 $ 342
Rate 7.23% 6.87%
AFX borrowings    
Debt Instrument [Line Items]    
Amount $ 235,000 $ 0
Rate 2.34% 0.00%
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Amount $ 1,135,000 $ 332,000
Rate 2.33% 1.41%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Amount $ 143,000 $ 135,000
Rate 2.30% 1.34%