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Borrowings and Subordinated Debentures (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Borrowings $ 905,812,000 $ 621,914,000
Notes Payable, Other Payables [Member]    
Debt Instrument [Line Items]    
Non-Recourse Debt $ 812,000 $ 3,914,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.41% 5.49%
Unused lines of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding $ 0 $ 0
American Financial Exchange [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding $ 40,000,000  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.81% 0.00%
American Financial Exchange [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding $ 40,000,000 $ 0
Federal Home Loan Bank of San Francisco [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.59% 0.27%
Line of Credit, Current $ 735,000,000 $ 618,000,000
Federal Home Loan Bank of San Francisco [Member] | Unused lines of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding $ 130,000,000 $ 0
Federal Home Loan Bank of San Francisco [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 0.55% 0.00%
Line of Credit, Current   $ 0