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Borrowings and Subordinated Debentures (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Borrowings $ 1,481,087 $ 1,371,114
Rate 2.58% 2.56%
Non‑recourse debt    
Debt Instrument [Line Items]    
Amount $ 87 $ 114
Rate 7.50% 7.50%
AFX borrowings    
Debt Instrument [Line Items]    
Amount $ 250,000 $ 190,000
Rate 2.52% 2.56%
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Amount $ 1,090,000 $ 1,040,000
Rate 2.60% 2.56%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Amount $ 141,000 $ 141,000
Rate 2.57% 2.53%