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Notes Payable and Subordinated Borrowings - Schedule of Debt (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Series A Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Effective Percentage (as a percent) 5.16%
Long-term Debt $ 37,575
Series B Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Effective Percentage (as a percent) 5.44%
Long-term Debt $ 66,228
Series C Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Effective Percentage (as a percent) 5.64%
Long-term Debt $ 47,434
Series D Senior Notes [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Effective Percentage (as a percent) 5.72%
Long-term Debt $ 16,798
Senior Notes [Member]  
Debt Instrument [Line Items]  
Long-term Debt $ 168,035