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Commitments and Contingencies - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]            
Rent expense     $ 2,015,000 $ 1,705,000 $ 5,859,000 $ 6,030,000
Debt Instrument [Line Items]            
Amount outstanding under Warehouse Agreement $ 5,790,000 $ 2,016,000 5,790,000   5,790,000  
Texas Capital Bank, Warehouse Agreement | Mortgage Warehouse Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 10,000,000        
Discount on variable interest rate   0.50%        
Stated interest rate   3.00%        
Lender participation interest   97.00%        
Amount outstanding under Warehouse Agreement 5,791,000 $ 833,000 5,791,000   5,791,000  
Western Alliance Bank | Mortgage Warehouse Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 10,000,000   $ 10,000,000   $ 10,000,000  
Stated interest rate 3.50%   3.50%   3.50%  
Basis spread on variable interest rate 2.75%          
Lender participation interest 98.00%          
Amount outstanding under Warehouse Agreement $ 0 $ 1,184,000 $ 0   $ 0  
Minimum            
Debt Instrument [Line Items]            
Operating lease term         1 year  
Maximum            
Debt Instrument [Line Items]            
Operating lease term         11 years