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Borrowings and Subordinated Debentures (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 918,208,000 $ 621,914,000
Non‑recourse debt    
Debt Instrument [Line Items]    
Non-Recourse Debt $ 1,208,000 $ 3,914,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.25% 5.49%
American Financial Exchange overnight borrowing    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.55% 0.00%
Line of Credit Facility, Amount Outstanding $ 40,000,000.0 $ 0
Federal Home Loan Bank Advances | FHLB secured overnight advance    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.47% 0.27%
Line of Credit Facility, Amount Outstanding $ 787,000,000 $ 618,000,000
Federal Home Loan Bank Advances | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.47% 0.00%
Line of Credit Facility, Amount Outstanding $ 90,000,000 $ 0