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Borrowings and Subordinated Debentures (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Borrowings $ 2,295,000 $ 1,759,008
Rate 0.45% 1.64%
AFX short-term borrowings    
Debt Instrument [Line Items]    
Balance $ 250,000 $ 300,000
Rate 0.18% 1.61%
Non‑recourse debt    
Debt Instrument [Line Items]    
Balance $ 0 $ 8
Rate 0.00% 7.50%
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Balance $ 1,904,000 $ 1,318,000
Rate 0.51% 1.66%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Balance $ 141,000 $ 141,000
Rate 0.11% 1.56%