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Notes Payable and Subordinated Borrowings - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Series A Senior Notes [Member]    
Debt Instrument [Line Items]    
Effective Annual Interest Rate 5.16%  
Carrying Value $ 37,776 $ 37,684
Series B Senior Notes [Member]    
Debt Instrument [Line Items]    
Effective Annual Interest Rate 5.44%  
Carrying Value $ 66,466 66,356
Series C Senior Notes [Member]    
Debt Instrument [Line Items]    
Effective Annual Interest Rate 5.64%  
Carrying Value $ 47,542 47,493
Series D Senior Notes [Member]    
Debt Instrument [Line Items]    
Effective Annual Interest Rate 5.72%  
Carrying Value $ 16,828 16,814
Senior Notes [Member]    
Debt Instrument [Line Items]    
Carrying Value $ 168,612 $ 168,347