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Borrowings and Subordinated Debentures (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 541,011,000 $ 621,914,000
Non‑recourse debt    
Debt Instrument [Line Items]    
Amount $ 1,011,000 $ 3,914,000
Rate 6.31% 5.49%
American Financial Exchange overnight borrowing    
Debt Instrument [Line Items]    
Amount $ 40,000,000 $ 0
Rate 0.55% 0.00%
Federal Home Loan Bank Advances | FHLB secured advances    
Debt Instrument [Line Items]    
Amount $ 410,000,000  
Amount   $ 618,000,000
Rate 0.37% 0.27%
Federal Home Loan Bank Advances | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Amount $ 90,000,000  
Amount   $ 0
Rate 0.35% 0.00%